A platform of semiconducting nanowires fabrication for advanced studies on doping and one-dimensional quantum structures

I-8: A platform of semiconducting nanowires for advanced studies on doping and one-dimensional quantum structures

Sun Xiaowei (exwsun@ntu.edu.sg),
Xu Chunxiang,
Tay Beng Kang (EEE, NTU)
Dong Zhili (MSE, NTU)
Yu Mingbin (IME)
Zhang Xinhai (IMRE)

Abstract
In this proposal, we would like to build up a platform for fabricating one-dimensional (1D) semiconductor nanowires and carry out related studies on electrical and optical properties. One-dimensional systems, such as nanowires, have fascinating optical and electrical properties. Studies on 1D system advance our knowledge on low dimensional physics and chemistry; while simultaneously providing the possibility for development of nanoscale electronics and optoelectronics. We would like to set up a comprehensive cold-wall vapor phase fabrication system, which is capable of producing rational catalyst-free growth of semiconducting nanowires, including zinc oxide, gallium nitride, silicon and germanium, etc., with doping and abrupt interface control, which will facilitate quantum structures (axial, radial and branch) fabrication in a single nanowire. Tremendous opportunity will be generated for next generation devices and applications, such as nanowire transistors (sensors), nanowire spintronic devices, nanoscale light-emitting devices, nanoscale resonant tunneling devices etc.

We have intensive experience on 1D nanostructures (see representative publications below). We are seeking collaborations on assembly nanostructures and construct nanowire into functional devices.

  1. C. X. Xu, X. W. Sun, B. J. Chen, Field emission from gallium doped zinc oxide nanofiber array, Appl. Phys. Lett. 84, 1540 (2004). (selected by Virtual Journal of Nanoscale Science & Technology, http://www.vjnano.org)
  2. C. X. Xu, X. W. Sun, Z. L. Dong, and M. B. Yu, “Zinc Oxide Nanodisk”, Appl. Phys. Lett. 85, 3878 - 3890 (2004). (selected by Virtual Journal of Nanoscale Science & Technology, http://www.vjnano.org)
  3. X. W. Sun, S. F. Yu, C. X. Xu, et al. Room –temperature ultraviolet lasing from zinc oxide mecrotubes, Jpn. J. Appl. Phys. 42, L1229 (2003) (selected by Nanopicture of the Day, http://www.nanopicoftheday.org)
  4. C. X. Xu, X. W. Sun, Field emission from zinc oxide nanopins, Appl. Phys. Lett. 83, 3806 (2003)
  5. C. X. Xu, X. W. Sun, C. Yuen, B. J. Chen, S. F. Yu, and Z. L. Dong, “Ultraviolet Amplified Spontaneous Emission from Self-Organized Network of Zinc Oxide Nanofibers”, Appl. Phys. Lett. 86, 011118 (2005).
  6. C. X. Xu, X. W. Sun, M. B. Yu, Y. Z. Xiong, Z. L. Dong, and J. S. Chen, “Magnetic nanobraids of iron-doped amorphous silica”, Appl. Phys. Lett. 85, 5364 (2004).