US 6,706,402 B2Grant
Nanotube films and articles
Issue Date:2004-03-16
•11 Claims
•20 Drawing Sheets
Abstract
Nanotube films and articles and methods of making the same are disclosed. A conductive article includes an aggregate of nanotube segments in which the nanotube segments contact other nanotube segments to define a plurality of conductive pathways along the article. The nanotube segments may be single walled carbon nanotubes, or multi-walled carbon nanotubes. The various segments may have different lengths and may include segments having a length shorter than the length of the article. The articles so formed may be disposed on substrates, and may form an electrical network of nanotubes within the article itself. Conductive articles may be made on a substrate by forming a nanotube fabric on the substrate, and defining a pattern within the fabric in which the pattern corresponds to the conductive article. The nanotube fabric may be formed by growing the nanotube fabric on the substrate using a catalyst, for example, in which the catalyst is a gas phase catalyst, or in which the catalyst is a metallic gas phase catalyst. The nanotube fabric may be formed by depositing a solution of suspended nanotubes on the substrate. The deposited solution may be spun to create a spin-coating of the solution. The solution may be deposited by dipping the substrate into the solution. The nanotube fabric is formed by spraying an aerosol having nanotubes onto a surface of the substrate.
Metadata
Assignee
- Nantero, Inc.
Inventors
- Thomas Rueckes
- Brent M. Segal
Application Information
Application Number:US 10/128,118
Filing Date:2002-04-23
Priority Date:2002-04-23
Art Unit:7
Classifications
IPC:
B32B 900
Field of Search:
4284084283674284024234471423445 R
Patent Drawings (20 sheets)
Description
Cross-Reference to Related Applications
[0002] This application is related to, and claims priority under 35 U.S.C. §120, to the following applications, all of which are assigned to the assignee of this application, and all of which are incorporated by reference in their entirety:
[0003] Electromechanical Memory Array Using Nanotube Ribbons and Method for Making Same (U.S. patent application Ser. No. 09/915,093, filed Jul. 25, 2001);
[0004] Electromechanical Memory Having Cell Selection Circuitry Constructed with Nanotube Technology (U.S. patent application Ser. No. 09/915,173, filed Jul. 25, 2001); and
[0005] Hybrid Circuit Having Nanotube Electromechanical Memory (U.S. patent application Ser. No. 09/915,095, filed Jul. 25, 2001).
Background
[0006] 1. Technical Field
[0007] This invention relates in general to carbon nanotube films, fabrics, layers, and articles and in particular to making electrically conductive articles from carbon nanotube films, fabrics, or layers for a variety of uses in circuits or the like.
[0008] 2. Discussion of Related Art
[0009] The reliable fabrication of electrically conductive, ultra-thin metallic layers and electrodes in the sub-10 nm regime is problematic, see, e.g., S. Wolf, Silicon Processing for the VLSI era; Volume 2—Process Integration (Lattice Press, Sunset Beach, 1990). Metal films in this size regime are usually non-continuous and not conductive over macroscopic distances. Furthermore, these sub-10 nm films are prone to thermal damage by electrical current making them unsuitable for applications such as electrical interconnects in semiconductor devices. Thermal damage of thin metal interconnects caused by their low heat conductivities is one of the main factors inhibiting dramatic miniaturization and performance improvements of highly integrated semiconductor devices.
[0010] Conventional interconnect technologies have a tendency to suffer from thermal damage and metal diffusion eroding the performance of the semiconductor devices especially from degradation of the electrical properties. These effects become even more pronounced with size reduction in current generation 0.18 um and 0.13 um structures, e.g. by metal diffusion through ultra-thin gate oxide layers.
[0011] There is therefore a need in the art for conductive elements that may operate well in contexts having high current densities or in extreme thermal conditions. This includes circuit contexts with very small feature sizes but includes other high current density extreme thermal environment contexts as well. There is also a need for conductive elements that will be less likely to diffuse undesirable amounts of contaminants into other circuit elements.
Summary
[0012] The invention provides nanotube films and articles and methods of making the same. Under one aspect of the invention, a conductive article includes an aggregate of nanotube segments in which the nanotube segments contact other nanotube segments to define a plurality of conductive pathways along the article.
[0013] Under other aspects of the invention, the nanotube segments may be single walled carbon nanotubes, or multi-walled carbon nanotubes. The various segments may have different lengths and may include segments having a length shorter than the length of the article.
[0014] The articles so formed may be disposed on substrates, and may form an electrical network of nanotubes within the article itself.
[0015] Under other aspects of the invention, conductive articles may be made on a substrate by forming a nanotube fabric on the substrate, and defining a pattern within the fabric in which the pattern corresponds to the conductive article.
[0016] Under other aspects of the invention, the nanotube fabric is formed by growing the nanotube fabric on the substrate using a catalyst, for example, in which the catalyst is a gas phase catalyst, or in which the catalyst is a metallic gas phase catalyst.
[0017] Under other aspects of the invention, the nanotube fabric is formed by depositing a solution of suspended nanotubes on a substrate. The deposited solution may be spun to create a spin-coating of the solution.
[0018] Under other aspects of the invention, the solution may be deposited by dipping the substrate into the solution.
[0019] Under other aspects of the invention, the nanotube fabric is formed by spraying an aerosol having nanotubes onto a surface of the substrate.
[0020] The invention provides a method of making a film of conductive nanotubes. Under one aspect of the invention a substrate is provided and a vapor-phase catalyst is introduced to foster growth of nanotubes. A carbon source is also introduced to grow a layer of nanotubes that are substantially parallel to a major surface of the substrate.
[0021] Under another aspect of the invention, the vapor-phase catalyst is a metallocene.
[0022] Under another aspect of the invention, conductive articles are made on a substrate, by forming a nanotube fabric on the substrate; defining a pattern within the fabric in which the pattern corresponds to the conductive article; and removing a portion of the fabric so that the patterned fabric remains on the substrate to form conductive articles.
[0023] Under another aspect of the invention, conductive articles are made on a substrate, by providing a substrate, introducing a vapor-phase catalyst to foster growth of nanotubes, and introducing a carbon source to grow a layer of nanotubes that are substantially parallel to a major surface of the substrate.
[0024] Under another aspect of the invention, conductive articles are made on a substrate, by providing a substrate; providing a patterned layer of material; providing a catalyst that fosters growth of nanotubes; and providing a carbon source, so as to grow nanotubes substantially parallel to a major surface of the substrate in regions defined by the pattern.
[0025] Under another aspect of the invention, the patterned layer of material is an insulator or a semiconductor and wherein the nanotubes grow over the patterned material.
[0026] Under another aspect of the invention, the patterned layer is a patterned metal layer and wherein the nanotubes grow in areas other than the patterned metal layer.
Brief Description of the Drawing
[0027] In the Drawing,
[0028] FIG. 1 illustrates a nanotube belt crossbar memory device according to certain embodiments of the invention;
[0029] FIGS. 2A-B illustrate two states of a memory cell according to certain embodiments of the invention;
[0030] FIG. 3 illustrates acts of making memory devices according to certain embodiments of the invention;
[0031] FIGS. 4-11 illustrate several forms of creating an intermediate structure used to make memory devices according to certain embodiments of the invention;
[0032] FIG. 12 illustrates the non-woven nanotube fabric, or matted nanotube layer, used to make certain embodiments of the invention;
[0033] FIG. 13 illustrates the matted nanotube layer in relation to hidden, underlying traces of certain embodiments of the invention;
[0034] FIG. 14 illustrates addressing logic of certain embodiments of the invention;
[0035] FIG. 15 illustrates a hybrid technology embodiment of the invention in which the memory core uses nanotube technology;
[0036] FIG. 16 illustrates a hybrid technology embodiment of the invention in which the memory core and addressing lines use nanotube ribbon technology;
[0037] FIG. 17 illustrates acts of making electrically conductive articles according to certain embodiments of the invention;
[0038] FIG. 18 illustrates how electrically conductive articles according to certain embodiments of the invention may be used to connect electrical components;
[0039] FIG. 19 illustrates a way of creating an intermediate structure according to certain embodiments of the invention; and
[0040] FIG. 20 illustrates a non-woven nanotube fabric, or matted nanotube layer, used to make certain embodiments of the invention.
Detailed Description
[0041] New electromechanical memory arrays and methods for making same are disclosed in which electromechanical memory cells are created that operate analogously to the NTWCM devices disclosed in WO 01/03208, which is hereby incorporated by reference in its entirety. However, unlike the NTWCM devices disclosed in WO 01/03208, new ribbons or belts made from a matted layer of nanotubes or a non-woven fabric of nanotubes are used as an electrically conductive element. At points in this disclosure, the ribbons are referred to as traces or electrically conductive articles. In some instances, the ribbons are suspended, and in other instances they are disposed on a substrate. In some instances, they are used to deflect to certain states under electrical control, and in other instances they do not move and instead are used simply to carry an electrical current or voltage. The new nanotube belt structures are believed to be easier to build at the desired levels of integration and scale (in number of devices made) and the geometries are more easily controlled. The new nanotube ribbons are believed to be able to more easily carry high current densities without suffering the above-outlined problems experienced or expected with metal traces.
[0042] Under certain embodiments of the invention, electrically conductive articles may be made from a nanotube fabric, layer, or film. Carbon nanotubes with tube diameters as little as 1 nm are electrical conductors that are able to carry extremely high current densities, see, e.g., Z. Yao, C. L. Kane, C. Dekker, Phys. Rev. Lett. 84, 2941 (2000). They also have the highest known heat conductivity, see, e.g., S. Berber, Y.-K. Kwon, D. Tomanek, Phys. Rev. Lett. 84, 4613 (2000), and are thermally and chemically stable, see, e.g., P. M. Ajayan, T. W. Ebbesen, Rep. Prog. Phys. 60, 1025 (1997). However, using individual nanotubes is problematic because of difficulties in growing them with suitably controlled orientation, length, and the like. Creating traces from nanotube fabrics allows the traces to retain many if not all of the benefits of individual nanotubes. Moreover, traces made from nanotube fabric have benefits not found in individual nanotubes. For example, since the traces are composed of many nanotubes in aggregation, the trace will not fail as the result of a failure or break of an individual nanotube. Instead, there are many alternate paths through which electrons may travel within a given trace. In effect, a trace made from nanotube fabric creates its own electrical network of individual nanotubes within the defined trace, each of which may conduct electrons. Moreover, by using nanotube fabrics, layers, or films, current technology may be used to create such traces.
[0043] Nanotube Ribbon Crossbar Memories (NTRCM)
[0044] Because the new nanotube belt crossbar memory devices operate analogously to NTWCM, the description of their architecture and principles of operation is brief. Reference may be made to WO 01/03208 for fuller description and background.
[0045] FIG. 1 illustrates an exemplary electromechanical memory array 100 constructed according to principles of preferred embodiments of the invention.
[0046] The array has a plurality of non-volatile memory cells 103 which can be in an “on” state 105 or “off” state 106. The actual number of such cells is immaterial to understanding the invention but the technology may support devices having information storage capacities equivalent to or larger than modern non-volatile circuit devices.
[0047] Each memory cell 103 includes a nanotube ribbon 101 suspended by one or more supports 102 over electrical traces or wires, e.g., 104.
[0048] Each crossing of a ribbon 101 and a wire, e.g., 104 forms a crossbar junction and defines a memory cell. Under certain embodiments, each cell may be read or written by applying currents and or voltages to electrodes 112 which are in electrical communication with ribbons 101 or through electrodes (not shown) in communication with traces or wires 104. The supports 102 are made from a layer 108 of silicon nitride (Si3N4). Below layer 108 is a gate oxide layer 109 separating the n-doped silicon traces 104 from an underlying silicon wafer 110.
[0049] Referring conjointly to FIGS. 1-2B, junction 106 illustrates the cell in a first physical and electrical state in which the nanotube ribbon 101 is separated from corresponding trace 104. Junction 105 illustrates the cell in a second physical and electrical state in which the nanotube ribbon 101 is deflected toward corresponding trace 104. In the first state, the junction is an open circuit, which may be sensed as such on either the ribbon 101 or trace 104 when so addressed. In the second state, the junction is a rectified junction (e.g., Schottky or PN), which may be sensed as such on either the tube 101 or trace 104 when so addressed.
[0050] Under certain embodiments, the nanotube ribbon 101 may be held in position at the supports by friction. In other embodiments the ribbon may be held by other means, such as by anchoring the ribbons to the supports using any of a variety of techniques. This friction can be increased through the use of chemical interactions including covalent bonding through the use of carbon compounds such as pyrenes or other chemically reactive species. Evaporated or spin-coated material such as metals, semiconductors or insulators especially silicon, titanium, silicon oxide or polyimide could also be added to increase the pinning strength. The nanotube ribbons or individual nanotubes can also be pinned through the use wafer bonding to the surface. See R. J. Chen et al., “Noncovalent Sidewall Functionalization of Single-Walled Carbon Nanotubes for Protein Immobiliation,” J. Am. Chem. Soc., 123, 2001, 3838-39 and Dai et al., Appl. Phys. Lett., 77, 2000, 3015-17 for exemplary techniques for pinning and coating nanotubes by metals. See also WO01/03208 for techniques.
[0051] Under certain preferred embodiments as shown in FIGS. 2A-B, a nanotube ribbon 101 has a width of about 180 nm and is pinned to a support 102 preferably fabricated of silicon nitride. The local area of trace 104 under ribbon 101 forms an n-doped silicon electrode and is positioned close to the supports 102 and preferably is no wider than the belt, e.g., 180 nm. The relative separation 208 from the top of the support 102 to the deflected position where the belt 101 attaches to electrode 206 (see FIG. 2B) should be approximately 5-50 nm. The magnitude of the separation 208 is designed to be compatible with electromechanical switching capabilities of the memory device. For this embodiment, the 5-50 nm separation is preferred for certain embodiments utilizing ribbons 101 made from carbon nanotubes, but other separations may be preferable for other materials. This magnitude arises from the interplay between strain energy and adhesion energy of the deflected nanotubes. These feature sizes are suggested in view of modern manufacturing techniques. Other embodiments may be made with much smaller (or larger) sizes to reflect the manufacturing equipment's capabilities.
[0052] The nanotube ribbon 101 of certain embodiments is formed from a non-woven fabric of entangled or matted nanotubes (more below). The switching parameters of the ribbon resemble those of individual nanotubes. Thus, the predicted switching times and voltages of the ribbon should approximate the same times and voltages of nanotubes. Unlike the prior art which relies on directed growth or chemical self-assembly of individual nanotubes, preferred embodiments of the present invention utilize fabrication techniques involving thin films and lithography. This method of fabrication lends itself to generation over large surfaces especially wafers of at least six inches. (In contrast, growing individual nanotubes over a distance beyond sub millimeter distances is currently unfeasible.) The ribbons should exhibit improved fault tolerances over individual nanotubes, by providing redundancy of conduction pathways contained with the ribbons. (If an individual nanotube breaks other tubes within the rib provide conductive paths, whereas if a sole nanotube were used the cell would be faulty.) Moreover, the resistances of the ribbons should be significantly lower than that for an individual nanotubes, thus, decreasing its impedance, since the ribbons may be made to have larger cross-sectional areas than individual nanotubes.
[0053] FIG. 3 illustrates a method of making certain embodiments of NTRCM devices 100. A first intermediate structure 302 is created or provided. In the illustrated embodiment, the structure 302 includes a silicon substrate 110 having an insulating layer 109 (such as silicon dioxide) and a silicon nitride layer (Si3N4) 108 that defines a plurality of supports 102. In this instance, the supports 102 are formed by rows of patterned silicon nitride, though many other arrangements are possible, such as a plurality of columns. Conductive traces 104 extend between supports 102. In this instance, the traces 104 are shown as essentially contacting the supports 102, but other arrangements are possible as are other geometries; for example, spaces may exist between trace 104 and support 102 and trace 104 may be fashioned as a wire or may have non-rectangular transverse, cross-sections, including triangular or trapezoidal. Sacrificial layers 304 are disposed above the traces 104 so as to define one planar surface 306 with the upper surface of the supports 102. This planar surface, as will be explained below, facilitates growth of a matted nanotube layer of certain embodiments.
[0054] Once such a structure 302 is created or provided, the upper surface 306 receives a catalyst 308. For example, under certain embodiments, a catalyst metal 308, containing iron (Fe), molybdenum (Mo), cobalt or other metals, is applied by spin-coating or other application techniques to create a second intermediate structure 310.
[0055] A matted layer 312 of nanotubes is then grown into a non-woven fabric of single-walled carbon nanotubes (SWNTs) to form a third intermediate structure 314. For example, the second intermediate structure 310 may be placed into an oven and heated to a high temperature (for example, about 800-1200° C.) while gases containing a carbon source, hydrogen and inert gas, such as argon or nitrogen, are flowed over the upper surface. This environment facilitates the generation or growth of the matted layer or film 312 of single-walled carbon nanotubes. The layer 312 is primarily one nanotube thick and the various tubes adhere to one another via Van der Waals forces. Occasionally, one nanotube grows over the top of another, though this growth is relatively infrequent due to the growth tendencies of the material. Under some embodiments (not shown), the catalyst 308 may be patterned to assist in growing the nanotubes with specific densities either more or less dense as is desired. When conditions of catalyst composition and density, growth environment, and time are properly controlled, nanotubes can be made to evenly distribute over a given field that is primarily a monolayer of nanotubes. Proper growth requires control of parameters including but not limited to catalyst composition and concentration, functionialization of the underlying surface, spin coating parameters (length and RPM), growth time, temperature and gas concentrations.
[0056] A photoresist may then be applied to the layer 312 and patterned to define ribbons in the matted layer of nanotubes 312. The ribbon patterns cross (for example, perpendicularly) the underlying traces 104. The photoresist is removed to leave ribbons 101 of non-woven nanotube fabric lying on planar surface 306 to form fourth intermediate structure 318.
[0057] The fourth intermediate structure 318 has portions 320 of its underlying sacrificial layer 304 exposed as shown. The structure 318 is then treated with an acid, such as HF, to remove the sacrificial layer 304, including the portion under the ribbons 101, thus forming an array 322 of ribbons 101 suspended over traces 104 and supported by supports 102.
[0058] Subsequent metalization may be used to form addressing electrodes, e.g., 112 shown in FIG. 1.
[0059] One aspect of the above technique is that the various growth, patterning, and etching operations may use conventional techniques, such as lithographic patterning. Currently, this may entail feature sizes (e.g., width of ribbon 101) of about 180 nm to as low as 130 nm, but the physical characteristics of the components are amenable to even smaller feature sizes if manufacturing capabilities permit.
[0060] As will be explained below, there are many possible ways of creating the intermediate structures or analogous structures described above. FIG. 4, for example, shows one way to create the first intermediate structure 302
[0061] A silicon wafer 400 is provided with an oxide layer 402. The oxide layer is preferably a few nanometers in thickness but could be as much 1 μm. A silicon nitride (Si3N4) layer 404 is deposited on top of the oxide surface 402. The silicon nitride layer is preferably at least 30 nm thick.
[0062] The silicon nitride layer 404 is then patterned and etched to generate cavities 406 to form support structure 407. With modern techniques the cavity width may be about 180 nm wide or perhaps smaller. The remaining silicon nitride material defines the supports 102 (e.g., as row, or perhaps columns).
[0063] A covering 408 of n-doped silicon is then deposited to fill the cavities 406. The covering 408 for exemplary embodiments may be about 1 μm thick but may be as thin as 30 nm.
[0064] The covering 408 is then processed, for example by self-flattening of thick silicon layers or by annealing, to produce a planar surface 306, discussed above, to form structure 411. In the case of self-flattening, reactive ion etching (RIE) with end-point detection (EPD) may be utilized until the upper surface 410 of the etched silicon nitride is reached.
[0065] The structure 411 is then oxidized to form and define sacrificial layers 304 of SiO2about 10-20 nm deep into planar surface 306.
[0066] The unconverted, remaining portions of silicon form traces 104.
[0067] FIG. 5 shows another method that may be used to create the NTRCM devices 100 of certain embodiments. A support structure 407, like that described in connection with FIG. 4, is provided. A layer 514 of n-doped silicon is then added using a CVD process, sputtering or electroplating. Under certain embodiments, layer 514 is added to be about half the height of the Si3N4supports 102.
[0068] After the layer 514 is added, an annealing step is performed to yield a planarized surface 306 to form a structure 411 like that described above. The annealing step causes the silicon of layer 514 to flow into the cavities 406.
[0069] Like that described in connection with FIG. 4, the structure 411 is then oxidized to form and define sacrificial layers 304 of SiO2about 10-20 nm deep into planar surface 306.
[0070] FIG. 6 shows another approach for forming an alternative first intermediate structure 302′. In this embodiment, a silicon substrate 600 is covered with a layer 602 of silicon nitride having a height 604 of at least 30 nm.
[0071] The silicon nitride layer 602 is then patterned and etched to generate spacings 606 and to defined supports 102. The etching process exposes a portion 608 of the surface of silicon substrate 600.
[0072] The exposed silicon surface 608 is oxidized to generate a silicon dioxide (SiO2) layer 610 having a thickness of a few nm. These layers 610 eventually insulate traces 104 analogously to the way insulating layer 109 did for the above-described structures 302.
[0073] Once the insulating layers 610 have been created, the traces 104 may be created in any of a variety of manner. FIG. 6 illustrates the processing steps of FIGS. 4-5 used to create such traces to illustrate this point.
[0074] FIG. 7 shows another approach for forming first intermediate structure 302. A silicon substrate 700 having a silicon dioxide layer 702 and a silicon nitride layer 704 receives a patterned photoresist layer 706. For example, a photoresist layer may be spin-coated on layer 704 and subsequently exposed and lithographically developed.
[0075] Reactive ion etching (RIE) or the like may then be used to etch the Si3N4layer 704 to form cavities 708 and to define supports 102.
[0076] Afterwards, n-doped silicon 710 may be deposited in the cavities 708. Under certain embodiments silicon is deposited to a height about equal to the height 712 of the Si3N4supports 102.
[0077] The photoresist 706 and silicon 710 on top of the photoresist 706 are then stripped away to form an intermediate structure 411 like that described above.
[0078] The structure 411 is then oxidized to generate the sacrificial SiO2layers 304.
[0079] FIG. 8 shows another approach for forming first intermediate structure 302. Under this approach, a starting structure 800 is provided having a lowest silicon layer 802 with a lowest silicon dioxide layer 804 on top of it. A second silicon layer 806 is on top of layer 804 and a second silicon dioxide layer 808 is on top of the second silicon layer 806.
[0080] The top silicon dioxide (SiO2) layer 808 is patterned by photolithography to create an RIE mask 810. The mask is used to etch the exposed portions 812 of second silicon layer 806 down to the first silicon dioxide layer 804. This etching creates cavities 814 and defines traces 104.
[0081] The cavities 814 are filled and covered with silicon nitride (Si3N4) 816.
[0082] The Si3N4covering 816 is backetched with RIE to the same height 818 as the remaining portions of the SiO2layer 806 covering the n-doped silicon electrodes 104 (which form the sacrificial layer 304).
[0083] FIG. 9 shows an approach for forming an alternative first intermediate structure 302″. Under this approach, a structure like 407 (shown in FIG. 4, but not FIG. 9) is provided. In this instance, the Si3N4supports 102 have a height of about 30 nm. A thin layer of metal 902 is deposited on top of the Si3N4supports 102 and on top of the exposed portions SiO2at the bottom of the cavities 904 as depicted by item 903. Metal 902 and 903 form temporary electrodes. A layer of n-doped silicon 906 may then be deposited or grown by electroplating, covering the electrode 903 until the silicon 906 achieves a height 908 at the top of the support 102 and contacting electrode 902. The growth process may be controlled by the onset of a current flow between the lower and upper metal electrodes 902,3.
[0084] The exposed metal electrodes 902 may then be removed by wet chemical methods or dry chemical methods. This forms an intermediate structure 411′ like the structure 411 described above, but with a buried electrode 903, as an artifact of the silicon growing process.
[0085] The structure 411′ is then oxidized to form sacrificial layers 304 at the exposed portions of silicon, as described above. For example, the layers 304 may be grown to a thickness of about 10 nm.
[0086] FIG. 10 shows another approach for forming first intermediate structure 302. A silicon substrate 1002 having a layer of silicon dioxide 1004 on top of it and a second layer 1006 of silicon (n-doped) on top of layer 1004 is used as a starting material. A mask layer 1008 is photolithographically patterned on top of layer 1006.
[0087] Using nitridization techniques, exposed portions 1010 of n-doped silicon layer 1006 are chemically converted to Si3N4supports 102. The unconverted portions of layer 1006 form traces 104.
[0088] The mask 1008 is removed forming a structure 411 like that described above.
[0089] The exposed portions 1012 of silicon surface are then oxidized to form the SiO2sacrificial layers 304.
[0090] FIG. 11 shows an approach for forming an alternative first intermediate structure 302′″. Under this approach a silicon substrate 1102 is layered with a thin film 1104 of Si3N4as a starting structure. On top of the silicon nitride layer 1104, n-doped silicon is added and lithographically patterned, by RIE, to form traces 104.
[0091] The surfaces of traces 104 are oxidized to form the SiO2layer 1106 which acts as an alternative form of sacrificial layer 304′.
[0092] The structure is overgrown with Si3N41108 and back etched to form a planar surface 306 and to form alternative first intermediate structure 302′″. As will be evident to those skilled in the art, under this approach, when the sacrificial layer is subsequently removed, traces 104 will be separated from supports 102. Other variations of this technique may be employed to create alternative transverse cross-sections of trace 104. For example, the traces 104 may be created to have a rounded top, or to have a triangular or trapezoidal cross section. In addition, the cross section may have other forms, such as a triangle with tapered sides.
[0093] As was explained above, once a first intermediate structure is formed, e.g., 302, a matted nanotube layer 312 is provided over the planar surface 306 of the structure 302. In preferred embodiments, the non-woven fabric layer 312 is grown over the structure through the use of a catalyst 308 and through the control of a growth environment. Other embodiments may provide the matted nanotube layer 312 separately and apply it directly over the structure 302. Though structure 302 under this approach preferably includes the sacrificial layer to provide a planar surface to receive the independently grown fabric, the sacrificial layer may not be necessary under such an approach.
[0094] Because the growth process causes the underside of such nanotubes to be in contact with planar surface 306 of intermediate structure 302, they exhibit a “self-assembly” trait as is suggested by FIG. 12. In particular, individual nanotubes tend to adhere to the surface on which they are grown whenever energetically favorable, such that they form substantially as a “monolayer.” Some nanotubes may grow over another so the monolayer is not expected to be perfect. The individual nanotubes do not “weave” with one another but do adhere with one another as a consequence of Van der Waals forces. FIG. 12 is an approximate depiction of an actual nanotube non-woven fabric. Because of the small feature sizes of nanotube, even modem scanning electron microscopy cannot “photograph” an actual fabric without loss of precision; nanotubes have feature sizes as small as 1-2 nm which is below the precision of SEM. FIG. 12 for example, suggests the fabric's matted nature; not clear from the figure, however, is that the fabric may have small areas of discontinuity with no tubes present. Each tube typically has a diameter 1-2 nm (thus defining a fabric layer about 1-2 nm) but may have lengths of a few microns but may be as long as 200 microns. The tubes may curve and occasionally cross one another. Tubes attach to one another via Van der Waals forces.
[0095] In certain embodiments, nanotubes grow substantially unrestrained in the x- and y-axis directions, but are substantially restricted in the z-axis (perpendicular to page of FIG. 12) as a consequence of the self-assembly trait. Other embodiments may supplement the above approach to growing matte 312 with the use of field-oriented or flow-oriented growth techniques. Such supplementation may be used to further tailor growth such that any growth in one planar axis (e.g. the x-axis) is retarded. This allows for a more even coverage of the desired area with a planar interwoven monolayer coating of nanotubes with a controllable density.
[0096] A plan view of the matted nanotube layer 312 with underlying silicon traces 104 is shown in FIG. 13.
[0097] As explained above, once the matted nanotube layer 312 is provided over the surface 306, the layer 312 is patterned and etched to define ribbons 101 of nanotube fabric that cross the supports 102. The sacrificial layer is then removed (e.g., with acid) forming the array 322 described above in connection with FIG. 3. Because the matted layer of nanotubes 312 form a non-woven fabric that is not a contiguous film, etchants or other chemicals may diffuse between the individual nanotube “fibers” and more easily reach the underlying components, such as the sacrificial layer.
[0098] Subsequent metalization may be used to form addressing electrodes, e.g., 112 shown in FIG. 1, as outlined above. Other embodiments use nanotube technology to implement addressing of memory cells instead of using metallized electrodes 112 and addressing lines (not shown).
[0099] More specifically, under certain embodiments described above, nanotubes are used to form NTRCM arrays. Certain embodiments use nanotube technology, whether in individual wire or belt form, to implement addressing logic to select the memory cell(s) for reading or writing operations. This approach furthers the integration of nanotube technology into system design and may provide beneficial functionality to higher-level system design. For example, under this approach the memory architecture will not only store memory contents in non-volatile manner but will inherently store the last memory address.
[0100] The nanotube-based memory cells have bistability characterized by a high ratio of resistance between “0” and “1” states. Switching between these states is accomplished by the application of specific voltages across the nanotube belt or wire and the underlying trace, in which at least one of the memory cell elements is a nanotube or a nanotube ribbon. In one approach, a “readout current” is applied and the voltage across this junction is determined with a “sense amplifier.” Reads are non-destructive, meaning that the cell retains its state, and no write-back operations are needed as is done with DRAM.
[0101] FIG. 14 depicts a branching binary select system, or decoder, 1400. As will be explained below, decoder 1400 may be implemented with nanotubes or nanotube ribbon technology. Moreover, the decoder may be constructed on the same circuit component as a nanotube memory cell array, e.g., NTRCM or NTWCM.
[0102] A perpendicular intersection of two lines 1404 and 1406 depicted as a dot 1402 indicates a junction of two nanotubes or nanotube ribbons. In this regard, the interaction is analogous to a “pass transistor” found in CMOS and other technology, in which the intersection may be opened or closed.
[0103] Locations such as 1420 where one nanotube or nanotube ribbon may cross another but which are not intended to create a crossbar junction may be insulated from one another with a lithographically patterned insulator between the components.
[0104] For the sake of clarity, the decoder illustrated is for a 3-bit binary address carried on addressing lines 1408. Depending on the value of the encoding the intersections (dots) will be switched to create only one path through which sensing current 1 may pass to select lines 1418.
[0105] To use this technique, a “dual rail” representation 1408 of each bit of the binary address is fashioned externally so that each of the address bits 1410 is presented in true and complementary form. Thus, line 1406 may be the logical true version of address line 1408aand line 1407 may be the logical complement of address line 1408a. The voltage values of the representation 1408 are consistent with that needed to switch a crossbar junction to the “1” or “0” state as described above.
[0106] In this fashion an address 1408 may be used to supply a sense current 1 to a bit or row of bits in an array, e.g., to nanotubes or nanotube ribbons. Likewise, the same approach may be used to sense a given trace, for example, selecting specific array column(s) to read sense from in conjunction with selecting a row. Thus this approach may be used for X and/or Y decoding both for reading and for writing operations.
[0107] Certain embodiments of the invention provide a hybrid technology circuit 1500, shown in FIG. 15. A core memory cell array 1502 is constructed using NTWCM or NTRCM, and that core is surrounded by semiconductor circuits forming X and Y address decoders 1504 and 1506; X and Y buffers 1508 and 1510; control logic 1512 and output buffers 1514. The circuitry surrounding the NTWCM or NWBCM core may be used for conventional interfacing functions, including providing read currents and sensing output voltages.
[0108] In other embodiments, the X and Y address decoders 1504 and 1506 may be substituted with the nanotube wire or belt addressing technique discussed above. In these embodiments the core would include memory cells and addressing logic.
[0109] In certain embodiments, the hybrid circuit 1500 may be formed by using a nanotube core (having either just memory cells or memory cells and addressing logic) and by implementing the surrounding circuitry using a field programmable gate array. The core and gate array circuitry may be contained in a single physical package if desired. Or, they may be packaged separately. For example, a hermitically packaged nanotube circuit (having memory or memory and addressing logic) may be combined with a PLD/FPGA/ASIC in which the I/O interfacing logic is contained. The resulting compact chipset provides access to the benefits of the NT memory for the user of the product, while maximizing the use of “off-the-shelf” technologies, which may be utilized on an as-needed basis by the manufacturer.
[0110] FIG. 16 depicts one possible implementation 1600 of the hybrid technology. A FPGA chip 1602 containing the buffering and control logic (described above) is connected via conducting traces on a (perhaps multilayer) printed circuit board (PCB) 1604 to a nanotube (NT) chip 1606 containing the memory cells and addressing logic.
[0111] This particular embodiment is suggested to conform to the PCI bus standard, typical of today's personal computers. Other passive circuitry, such as capacitors, resistors, transformers, etc. (not pictured) would also be necessary to conform to the PCI standard. A front-side bus speed of 200 MHz-400 MHz is annotated, suggesting the kinds of external clock speeds such a chipset might run at. This speed is limited by the PCB interconnects and FPGA/PLD/ASIC speed, and also the chip packages, not the NT memory cell speed.
[0112] Carbon Nanotube Films, Layers, Fabrics, and Articles
[0113] The above embodiments of NTRCM and addressing lines use traces or electrically conductive articles made from nanotube layers 312, such as those shown in FIGS. 3 and 12. The layers may have thickness of about 1 nm or less, i.e., the thickness of a given nanotube. The nanotube matte 312 is grown or deposited on a surface, such as that of a silicon wafer, to form a contiguous film of a given density. The two dimensional film can then be patterned to generate electrically conductive lines or traces ranging in width from 1 nm (the intrinsic minimum size of a nanotube) to hundreds of microns or greater, depending on the application and context. The pattern can be generated at multiple length and width scales to allow the interconnection of various sized semiconductor devices such as transistors or memory elements and eventually fanning out to bond pads or other interconnecting materials or constructs. The nanotube interconnects can be metallized if necessary to connect different materials because of their intrinsic properties that allow easy contact to metallic or semiconductor materials.
[0114] The traces and electrically conductive articles may be used in other forms of circuits. For example, nanotube traces may be used for their ability to withstand high current densities, normally found in very small sized traces (e.g., sub 10 nm regimes). They may also be used to reduce the likelihood of contaminating other circuit features.
[0115] FIG. 17, for example, illustrates an exemplary use of nanotube ribbons, traces, or electrically conductive articles over a substrate. (By inspection, one can see that FIG. 17 resembles FIG. 3, but in this instance the film 312 is grown over a substrate, instead of growing it over an intermediate structure 310.) In this example, a silicon substrate 110 has an oxide layer 109, similar to that shown in FIG. 3. To facilitate growth or deposition of the film 312, a planar surface (shown as 306 in FIG. 3, but not shown in FIG. 17) may be generated. A film 312 with single- and/or multi-walled nanotubes may then be grown over the combination, e.g., using CVD, or deposited on the combination, e.g., via spin coating. The film 312 is primarily one nanotube thick if single-walled nanotubes are used but can be substantially thicker if multi-walled nanotubes are used, e.g., up to 1000 nm.
[0116] If the film is to be grown, a catalyst may be used, as described above. However, the catalyst (shown as 308 in FIG. 3, but not shown in FIG. 17) does not need to be deposited directly on the surface of the substrate; instead or in addition, it may be provided in a gaseous form as part of the CVD process. For example, a gas phase metallic species such as ferrocene could be used. Ferrocene and other gas phase metallic species grow carbon nanotubes as do other species containing iron, molybdenum, tungsten, cobalt and other transition metals. These are all suitable for forming catalysts in the gas phase. The metallic gas-phase catalyst can be optimized or modified along with the proper temperature, pressure, surface preparation and growth time to generate a nanotube matte 312.
[0117] If the film 312 is to be deposited, pre-grown nanotubes may be used. For example, under certain embodiments of the invention, nanotubes may be suspended in a solvent in a soluble or insoluble form and spin-coated over the surface to generate the nanotube film 312. In such an arrangement the film may be one or more nanotubes thick, depending on the spin profile and other process parameters. Appropriate solvents include dimethylformamide, n-methyl pyrollidinone, n-methyl formamide, orthodichlorobenzene, paradichlorobenzene, 1,2,dichloroethane, alcohols, water with appropriate surfactants such as sodium dodecylsulfate or TRITON X-100 or others. The nanotube concentration and deposition parameters such as surface functionalization, spin-coating speed, temperature, pH and time can be adjusted for controlled deposition of monolayers or multilayers of nanotubes as required.
[0118] The nanotube film 312 could also be deposited by dipping the wafer or substrate in a solution of soluble or suspended nanotubes. The film could also be formed by spraying the nanotubes in the form of an aerosol onto a surface.
[0119] When conditions of catalyst composition and density, growth environment, and time are properly controlled, nanotubes can be made to evenly distribute over a given field that is primarily a monolayer of nanotubes.
[0120] Upon formation of the nanotube matte 312, a photoresist layer may be spin-coated on the nanotube film 312 and patterned by exposure or the like to define conductive traces. In the example of FIG. 17, the traces are shown as parallel straight traces, but the trace definition may take other forms. The defined traces can have a width of at least 1 nm and as much as 100 microns or more depending upon the type of device which is to be interconnected.
[0121] Once so defined, the exposed photoresist may be processed to remove some of the layer but to leave the traces 101. Subsequent metallization may be used to form addressing electrodes or a fanned interconnect structure, e.g., 1706 shown in FIG. 17.
[0122] With reference to FIG. 18, nanotube ribbon patterns 1802 may then be connected to other ribbons 101, metallic traces (not shown) or electronic features 1806. For example, with reference to intermediate structure 1800, the nanotube traces 101 may be connected to nanotube traces 1802 having different feature sizes, such as width. The traces 101 may also be connected to elements 112, which may be metal contacts or bonding pads (though not shown to scale in this figure). With reference to intermediate structure 1804, the traces 1010 may connect to memory elements such as in 1804, which may be formed as NTRCM cells or with semiconductor sites. With reference to intermediate structure 1808, the traces may connect electronic processing sites or logic 1806. Though not necessarily drawn to scale, the traces 101 may also connect bond pads, represented by item 112.
[0123] While these interconnects may primarily be formed of a monolayer of nanotubes, multilayer ribbons and mattes can also be envisioned using proper growth conditions. This requires control of parameters including but not limited to catalyst composition and concentration, functionalization of the underlying surface, spin coating parameters (length and RPM, for example 40 seconds, 50-5000 rpm), growth time, temperature and gas concentrations.
[0124] One aspect of the above technique is that the various growth, deposition, patterning, and etching operations may use conventional techniques, such as lithographic patterning. With current technology, traces may be made to have widths of about 180 nm to as low as 130 nm. However, the physical characteristics of the traces 101 are amenable to even smaller feature sizes if manufacturing capabilities permit.
[0125] Conventional interconnect technologies have a tendency to suffer from thermal damage and metal diffusion eroding the performance of the semiconductor devices especially from degradation of the electrical properties. These effects become even more pronounced with size reduction in current generation 0.18 um and 0.13 um structures, e.g. by metal diffusion through ultra-thin gate oxide layers. In contrast, carbon nanotube ribbons 101 are not beset with these problems. They are substantially more robust having the highest known thermal conductivities and are not prone to thermal failure. Furthermore, no metal or dopant diffusion can occur since they are constructed entirely of covalently bound carbon atoms.
[0126] FIG. 19 shows another approach for forming first intermediate structure 302. A silicon substrate 1900 having a silicon dioxide layer 1902 receives a patterned photoresist layer 1904. For example, a photoresist layer may be spin-coated on layer 1902 and subsequently exposed and lithographically developed yielding cavities 1906 and a mask pattern 1908.
[0127] Afterwards, n-doped silicon or metal such as molybdenum, tungsten or tantalum 1910 and a sacrificial layer 1912 such as aluminum oxide may be deposited in the cavities 1906, also forming corresponding features 1914 and 1916.
[0128] The photoresist 1912, material 1914 and aluminum oxide (Al2O3) 1916 on top of the photoresist 1912 are then stripped away to form an intermediate structure 1918 with electrodes 104 and sacrificial layer 304. A spin-on-glass (SOG) such as flowable oxide (FOX) is spin-coated over the structure 1918 and annealed using a ramped temperature protocol at 600° C. using standard techniques forming a SiO2layer 1920 at a height of from 200-2000 nm above the top of the sacrificial layer 1912.
[0129] Reactive ion etching (RIE) or the like may then be used to etch the SiO2layer 1920 to form a structure 302 with supports 102.
[0130] The choice of electrode material is limited by the method by which the nanotubes are placed upon the substrate surface. The three above methods include spin-coated catalyst-based growth, gas-phase catalyst-assisted CVD and spin-coating or direct deposition of nanotubes. In the case of the catalyst-based growth as has been described above the catalyst is distributed on the surface either by spin-coating, or dipping the substrate in the catalyst material followed by standard washing protocols. In each of these cases the nanotubes are then grown via a CVD process at 800° C. using a combination of hydrogen and carbon-containing precursor gas as has been described above. Thus, electrode materials which are sufficiently robust to survive these temperatures would be preferred including molybdenum, tungsten, tantalum, germanium, copper and alloys thereof. The electrode material can be constructed of a single or stacked structure of materials including silicon, tungsten, molybdenum, tantalum, copper and others. The stacked electrode structure may assist with or be sufficient in creating a Schottky barrier sufficient for rectification of each memory bit.
[0131] In the event that the nanotubes are grown using a gas-phase catalyst such as ferrocene, it is possible to envision substantially lower temperatures being required for growth allowing the use of electrode materials that melt at a substantially lower temperature less than 800° C. and as low as 400° C. Some gas-phase catalysts of interest may include cobalt, tungsten, molybdenum or rhenium metallocenes containing five of six-membered rings. These compounds can with the proper knowledge of inorganic chemistry be synthesized and brought by the use of a bubbler into the gas-phase to act as nucleation sites on substrates for nanotube growth. Of course these materials would be substantively compatible with the typical CMOS processes known in the literature and used by standard industrial fabrication facilities.
[0132] In the event that nanotubes are deposited on a surface at room temperature by spin-coating of a solution or suspension of nanotubes then the choice of electrode materials is expanded substantially. In this case there is no high temperature step and any metal typically compatible with standard CMOS metallization conditions would be acceptable especially, aluminum, and alloys thereof.
[0133] The sacrificial layer 304 can be constructed of Al2O3, metal oxides, salts, metals and other materials. The intermediate structure 302 can be formed using a variety of materials to form the supports 102 including SOG, SiO2and others. In the event that a low temperature spin-coating of nanotube protocol is chosen the materials suitable to be sacrificial layers expands substantially. This could include materials such as PMMA or other polymers, metals such tungsten, chromium, aluminum, bismuth and other transition and main group metals. Also other semiconductors such as germanium and insulators such as salts, oxides and other chalcogenides.
[0134] The choice of materials for the support layer greatly depends upon the method chosen for nanotube growth and other factors. In the even that a low-temperature process is chosen for placing nanotubes on the surface, one can envision utilizing such materials as Al2O3, silicon monoxide, semiconductors, insulators and polymers such as polyimide.
[0135] The materials selection process is confined to those materials that are compatible with the fabrication process described above. It is understood by those sufficiently skilled in the art that upon selection of a particular electrode material, the sacrificial layer and support materials naturally become limited based upon typical processing steps available in semiconductor fabrication. Likewise if a particular sacrificial layer is chosen the choices of electrode and sacrificial layer materials is suitably limited. Furthermore, upon selection of a particular support material it follows that the electrode and sacrificial layer materials choice is likewise limited.
[0136] FIG. 20 shows an Atomic Force Microscopic (AFM) image of an exemplary nanotube fabric 312. In this figure, each nanotube is about 1.5 nm in diameter. (The image is fuzzy due to the inherent limitations in the microscopy, not due to the actual texture of a given nanotube.) This image is at the lateral resolution limit of AFM.
[0137] Though most of the disclosure above is written as if the fabric were made of nanotubes of the same type, e.g., all single walled, the fabrics may be composed of all multi-walled structures or of a combination of single- and multi-walled structures.
[0138] Other Embodiments
[0139] In order to facilitate the growth of interconnects or electrode materials it may become useful to first form a pattern using standard lithographic methods to define regions where the nanotubes are intended to grow in a horizontal fashion over the surface. Such an approach has been used to pattern SiO2structures to grow thick multiwalled vertical nanotubes. In a similar approach patterned SiO2can be used for the purpose of growing horizontal nonotube films with a thickness of 1-1000 nm to create structures of the form described above such as 101. Other materials which provide a support for nanotube growth and nucleation such as insulators and metal oxides may be useful when used in concert with properly chosen gas-phase metallocenes or other vaporizeable metallic precursors to yield patterned nanotube ribbons. This underlying patterned layer could also act as a sacrificial layer which upon removal would form a suspended nanotubes. This method of growth represents a form of “positive” growth whereby the nanotubes use the prepatterned surface as a nucleation site.
[0140] In a further embodiment one can envision using a “negative” growth method whereby the lithographically patterned substrate contains a metallic or other material which does not support nanotube growth. When a proper gas-phase precursor such as a metallocene or similar compound is supplied the nanotubes would substantively grow only in the regions without the patterned material. The removal of an underlying material could provide suspended nanotubes 101 or interconnect structures upon the removal of the patterned metallic species.
[0141] In yet another embodiment, instead of using wet-chemical removal of sacrificial layer to suspend nanotubes at specific height over electrodes, a controlled etch of the electrode (i.e. 15 nm etch of 0.18 um wide electrode) can be used; e.g. metal (e.g. copper) and semiconductor (e.g. silicon) electrodes can be etched at etch rates of a few nanometer per second.
[0142] In another embodiment pinning of nanotubes onto the supports using an overlayed thin coating to prevent slipping of tubes during operation. This would open “windows” just over the memory cell itself.
[0143] The electrical properties of the layers and electrically conductive articles can be tuned by controlling the cross section of the nanotube ribbons. For example, the ribbon thickness may be increased at a given width and nanotube density. The higher the cross section, the greater the number of conduction channels leading to enhanced electrical properties.
[0144] The method of preparing of the nanotube ribbons allows continuous conductivity even over rough surface topologies. In contrast, typical evaporation of metallic electrodes would suffer from structural and thus, electrical defects.
[0145] Besides carbon nanotubes other materials with electronic and mechanical properties suitable for electromechanical switching could be envisioned. These materials would have properties similar to carbon nanotubes but with different and likely reduced tensile strength. The tensile strain and adhesion energies of the material must fall within a range to allow bistability of the junction and electromechanical switching properties to exist within acceptable tolerances.
[0146] For the purpose of integrating CMOS logic for addressing two approaches can be envisioned. In the first embodiment the nanotube array will be integrated before metallization but after ion implantation and planarization of the CMOS logic devices. A second method involves growth of the nanotube arrays before fabrication of the CMOS devices involving ion implementation and high temperature annealing steps. Upon completion of these steps the final metallization of both the nanotube ribbons and the CMOS devices will proceed using standard and widely used protocols.
[0147] Electrodes consisting of n-doped silicon on top of some metal or semiconductor line can also be envisioned. This will still provide rectifying junctions in the ON state so that no multiple current pathways exist.
[0148] In addition to rectifying junctions, there are other widely accepted and used methods to prevent the occurrence of electrical crosstalk (i.e. multiple current pathways) in crossbar arrays. Tunnel barriers on top of the static, lithographically fabricated electrodes prevent the formation of ohmic ON states. No leakage currents at zero bias voltage will occur but a small bias voltage has to be applied for the charge carriers to overcome this barrier and tunnel between the crossing lines.
[0149] Methods to increase the adhesion energies through the use of ionic, covalent or other forces can be envisioned to alter the interactions with the electrode surfaces. These methods can be used to extend the range of bistability with these junctions.
[0150] Nanotubes can be functionalized with planar conjugated hydrocarbons such as pyrenes which may then aid in enhancing the internal adhesion between nanotubes within the ribbons.
[0151] Certain of the above aspects, such as the hybrid circuits and the nanotube technology for addressing, are applicable to individual nanotubes (e.g., using directed growth techniques, etc.) or to nanotube ribbons.
[0152] It will be further appreciated that the scope of the present invention is not limited to the above-described embodiments but rather is defined by the appended claims, and that these claims will encompass modifications of and improvements to what has been described.
Claims
Post-issuance certificates present
The text shown below may not reflect later post-issuance changes.
What is claimed is:
1. A conductive article comprising a non-woven aggregate of nanotube segments wherein nanotube segments contact other nanotube segments to define a plurality of conductive pathways along the article.
2. The article of claim 1 wherein the nanotube segments include single walled carbon nanotubes.
3. The article of claim 1 wherein the nanotube segments include multi-walled carbon nanotubes.
4. The article of claim 1 wherein the nanotube segments have different lengths.
5. The article of claim 1 wherein the nanotube segments include segments having a length shorter than the length of the article.
6. A conductive trace comprising a non-woven aggregate of nanotubes to form an electrical network of nanotubes in contact with other nanotubes to define a plurality of conductive pathways along the trace.
7. The conductive trace of claim 6 wherein the nanotubes include single walled carbon nanotubes.
8. The conductive trace of claim 6 wherein the nanotubes include multi-walled carbon nanotubes.
9. The conductive trace of claim 6 wherein the nanotubes have different lengths.
10. The conductive trace of claim 6 wherein the nanotubes include segments having a length shorter than the length of the trace.
11. A conductive element having a predefined shape and including a non-woven aggregate of nanotubes in electrical contact, wherein the predefined shape has a predefined orientation and wherein the nanotubes are not individually constrained to said orientation.
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