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Silicon nanowire

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Silicon nanowires, also referred to as SiNWs, are a type of semiconductor nanowire most often formed from a silicon precursor by etching of a solid or through catalyzed growth from a vapor or liquid phase. Such nanowires have promising applications in lithium-ion batteries, thermoelectrics and sensors. Initial synthesis of SiNWs is often accompanied by thermal oxidation steps to yield structures of accurately tailored size and morphology.[1]

Schematic of silicon nanowire

SiNWs have unique properties that are not seen in bulk (three-dimensional) silicon materials. These properties arise from an unusual quasi one-dimensional electronic structure and are the subject of research across numerous disciplines and applications. The reason that SiNWs are considered one of the most important one-dimensional materials is they could have a function as building blocks for nanoscale electronics assembled without the need for complex and costly fabrication facilities.[2] SiNWs are frequently studied towards applications including photovoltaics, nanowire batteries, thermoelectrics and non-volatile memory.[3]

Applications

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Owing to their unique physical and chemical properties, silicon nanowires are a promising candidate for a wide range of applications that draw on their unique physico-chemical characteristics, which differ from those of bulk silicon material.[1]

SiNWs exhibit charge trapping behavior which renders such systems of value in applications necessitating electron hole separation such as photovoltaics, and photocatalysts.[4] Recent experiment on nanowire solar cells has led to a remarkable improvement of the power conversion efficiency of SiNW solar cells from <1% to >17% in the last few years.[5]

The ability for lithium ions to intercalate into silicon structures renders various Si nanostructures of interest towards applications as anodes in Li-ion batteries (LiBs). SiNWs are of particular merit as such anodes as they exhibit the ability to undergo significant lithiation while maintaining structural integrity and electrical connectivity.[6]

Silicon nanowires are efficient thermoelectric generators because they combine a high electrical conductivity, owing to the bulk properties of doped Si, with low thermal conductivity due to the small cross section.[7]

Silicon nanowire field-effect transistor (SiNWFET)

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Charge trapping behavior and tunable surface governed transport properties of SiNWs render this category of nanostructures of interest towards use as metal insulator semiconductors and field effect transistors,[8] where the silicon nanowire is the main channel of the FET which connect the source to the drain terminal, facilitating electron transfer between the two terminals with further applications as nano-electronic storage devices,[9] in flash memory, logic devices as well as chemical, gas and biological sensors.[3][10][11]

Since SiNWFET was first reported in 2001,[12] it has caused wide concern in the sensor area, because of their superior physical properties such as high carrier mobility,[13] high current switch ratio, and close to ideal subthreshold slope. Furthermore, it is cost-efficient and could be manufactured on large scale, since it is combined with CMOS fabricating technology. Specifically, in bioresearch, SiNWFET has high sensitivity and specificity to biological targets and could offer label-free detection after being modified with small biological molecules to match the target object. What’s more, SiNWFET could be fabricated in arrays and be selectively functionalized, which enables the simultaneous detection and analysis of multiple targets.[14] Multiplexed detection could greatly improve throughput and efficiency of biodetection.

Synthesis

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Several synthesis methods are known for SiNWs and these can be broadly divided into methods which start with bulk silicon and remove material to yield nanowires, also known as top-down synthesis, and methods which use a chemical or vapor precursor to build nanowires in a process generally considered to be bottom-up synthesis.[3]

Top down synthesis methods

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These methods use material removal techniques to produce nanostructures from a bulk precursor

Bottom-up synthesis methods

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  • Vapour–liquid–solid (VLS) growth – a type of catalysed CVD often using silane as Si precursor and gold nanoparticles as catalyst (or 'seed').[3]
  • Molecular beam epitaxy – a form of PVD applied in plasma environment[16]
  • Precipitation from a solution – a variation of the VLS method, aptly named supercritical fluid liquid solid (SFLS), that uses a supercritical fluid (e.g. organosilane at high temperature and pressure) as Si precursor instead of vapor. The catalyst would be a colloid in solution, such as colloidal gold nanoparticles, and the SiNWs are grown in this solution[16][18]

Thermal oxidation

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Subsequent to physical or chemical processing, either top-down or bottom-up, to obtain initial silicon nanostructures, thermal oxidation steps are often applied in order to obtain materials with desired size and aspect ratio. Silicon nanowires exhibit a distinct and useful self-limiting oxidation behaviour whereby oxidation effectively ceases due to diffusion limitations, which can be modeled.[1] This phenomenon allows accurate control of dimensions and aspect ratios in SiNWs and has been used to obtain high aspect ratio SiNWs with diameters below 5 nm.[19] The self-limiting oxidation of SiNWs is of value towards lithium-ion battery materials.

Outlook

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There is significant interest in SiNWs for their unique properties and the ability to control size and aspect ratio with great accuracy. As yet, limitations in large-scale fabrication impede the uptake of this material in the full range of investigated applications. Combined studies of synthesis methods, oxidation kinetics and properties of SiNW systems aim to overcome the present limitations and facilitate the implementation of SiNW systems, for example, high quality vapor-liquid-solid–grown SiNWs with smooth surfaces can be reversibly stretched with 10% or more elastic strain, approaching the theoretical elastic limit of silicon, which could open the doors for the emerging “elastic strain engineering” and flexible bio-/nano-electronics.[20]

References

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  1. ^ a b c Liu, M.; Peng, J.; et al. (2016). "Two-dimensional modeling of the self-limiting oxidation in silicon and tungsten nanowires". Theoretical and Applied Mechanics Letters. 6 (5): 195–199. arXiv:1911.08908. Bibcode:2016TAML....6..195L. doi:10.1016/j.taml.2016.08.002.
  2. ^ Yi, Cui; Charles M., Lieber (2001). "Functional Nanoscale Electronic Devices Assembled Using Silicon Nanowire Building Blocks". Science. 291 (5505): 851–853. Bibcode:2001Sci...291..851C. doi:10.1126/science.291.5505.851. PMID 11157160.
  3. ^ a b c d e Mikolajick, Thomas; Heinzig, Andre; Trommer, Jens; et al. (2013). "Silicon nanowires–a versatile technology platform". Physica Status Solidi RRL. 7 (10): 793–799. Bibcode:2013PSSRR...7..793M. doi:10.1002/pssr.201307247. S2CID 93989192.
  4. ^ Tsakalakos, L.; Balch, J.; Fronheiser, J.; Korevaar, B. (2007). "Silicon nanowire solar cells". Applied Physics Letters. 91 (23): 233117. Bibcode:2007ApPhL..91w3117T. doi:10.1063/1.2821113.
  5. ^ Yu, Peng; Wu, Jiang; Liu, Shenting; Xiong, Jie; Jagadish, Chennupati; Wang, Zhiming M. (2016-12-01). "Design and fabrication of silicon nanowires towards efficient solar cells" (PDF). Nano Today. 11 (6): 704–737. doi:10.1016/j.nantod.2016.10.001.
  6. ^ Chan, C.; Peng, H.; et al. (2008). "High-performance lithium battery anodes using silicon nanowires". Nature Nanotechnology. 3 (1): 31–35. Bibcode:2008NatNa...3...31C. doi:10.1038/nnano.2007.411. PMID 18654447.
  7. ^ Zhan, Tianzhuo; Yamato, Ryo; Hashimoto, Shuichiro; Tomita, Motohiro; Oba, Shunsuke; Himeda, Yuya; Mesaki, Kohei; Takezawa, Hiroki; Yokogawa, Ryo; Xu, Yibin; Matsukawa, Takashi; Ogura, Atsushi; Kamakura, Yoshinari; Watanabe, Takanobu (2018). "Miniaturized planar Si-nanowire micro-thermoelectric generator using exuded thermal field for power generation". Science and Technology of Advanced Materials. 19 (1): 443–453. Bibcode:2018STAdM..19..443Z. doi:10.1080/14686996.2018.1460177. PMC 5974757. PMID 29868148.
  8. ^ Cui, Yi; Zhong, Zhaohui; Wang, Deli; Wang, Wayne U.; Lieber, Charles M. (2003). "High Performance Silicon Nanowire Field Effect Transistors". Nano Letters. 3 (2): 149–152. Bibcode:2003NanoL...3..149C. CiteSeerX 10.1.1.468.3218. doi:10.1021/nl025875l.
  9. ^ Tian, Bozhi; Xiaolin, Zheng; et al. (2007). "Coaxial silicon nanowires as solar cells and nanoelectronic power sources". Nature. 449 (7164): 885–889. Bibcode:2007Natur.449..885T. doi:10.1038/nature06181. PMID 17943126. S2CID 2688078.
  10. ^ Daniel, Shir; et al. (2006). "Oxidation of silicon nanowires". Journal of Vacuum Science & Technology. 24 (3): 1333–1336. Bibcode:2006JVSTB..24.1333S. doi:10.1116/1.2198847.
  11. ^ Hu, Qitao; Solomon, Paul; Österlund, Lars; Zhang, Zhen (2024-06-19). "Nanotransistor-based gas sensing with record-high sensitivity enabled by electron trapping effect in nanoparticles". Nature Communications. 15 (1): 5259. Bibcode:2024NatCo..15.5259H. doi:10.1038/s41467-024-49658-3. ISSN 2041-1723. PMC 11187184. PMID 38898091.
  12. ^ Y, Cui (2001). "Nanowire nanosensors for highly sensitive and selective detection of biological and chemical species". Science. 293 (5533): 1289-1292. Bibcode:2001Sci...293.1289C. doi:10.1126/science.1062711. PMID 11509722.
  13. ^ Song, Y (2022). "Highly Stretchable High-Performance Silicon Nanowire Field Effect Transistors Integrated on Elastomer Substrates". Advanced Science. 9 (9): e2105623. doi:10.1002/advs.202105623. PMC 8948590. PMID 35092351.
  14. ^ Gao, A. (2017). "Multiplexed detection of lung cancer biomarkers in patients serum with CMOS-compatible silicon nanowire arrays". Biosens. Bioelectron. 91 (15): 482-488. doi:10.1016/j.bios.2016.12.07 (inactive 2024-11-05).{{cite journal}}: CS1 maint: DOI inactive as of November 2024 (link)
  15. ^ Huang, Z.; Fang, H.; Zhu, J. (2007). "Fabrication of silicon nanowire arrays with controlled diameter, length, and density". Advanced Materials. 19 (5): 744–748. Bibcode:2007AdM....19..744H. doi:10.1002/adma.200600892. S2CID 136639488.
  16. ^ a b c Shao, M.; Duo Duo Ma, D.; Lee, ST (2010). "Silicon nanowires–synthesis, properties, and applications". European Journal of Inorganic Chemistry. 2010 (27): 4264–4278. doi:10.1002/ejic.201000634.
  17. ^ Huang, Zhipeng; Geyer, Nadine; Werner, Peter; Boor, Johannes de; Gösele, Ulrich (2011). "Metal-Assisted Chemical Etching of Silicon: A Review". Advanced Materials. 23 (2): 285–308. Bibcode:2011AdM....23..285H. doi:10.1002/adma.201001784. ISSN 1521-4095. PMID 20859941. S2CID 205237664.
  18. ^ Holmes, J.; Keith, P.; Johnston, R.; Doty, C. (2000). "Control of thickness and orientation of solution-grown silicon nanowires". Science. 287 (5457): 1471–1473. Bibcode:2000Sci...287.1471H. doi:10.1126/science.287.5457.1471. PMID 10688792.
  19. ^ Liu, H.I.; Biegelsen, D.K.; Ponce, F.A.; Johnson, N.M.; Pease, R.F.W. (1994). "Self-limiting oxidation for fabricating sub-5 nm silicon nanowires". Applied Physics Letters. 64 (11): 1383. Bibcode:1994ApPhL..64.1383L. doi:10.1063/1.111914.
  20. ^ Zhang, H.; Tersoff, J.; Xu, S.; et al. (2016). "Approaching the ideal elastic strain limit in silicon nanowires". Science Advances. 2 (8): e1501382. Bibcode:2016SciA....2E1382Z. doi:10.1126/sciadv.1501382. PMC 4988777. PMID 27540586.
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