Nano Archive

Strain-driven electronic band structure modulation of Si nanowires

Hong, Ki-Ha and Kim, Jongseob and Lee, Sung-Hoon and Shin, Jai Kwang (2008) Strain-driven electronic band structure modulation of Si nanowires. NANO LETTERS, 8 (5). pp. 1335-1340.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/nl0734140

Abstract

One of the major challenges toward Si nanowire (SiNW) based photonic devices is controlling the electronic band structure of the Si nanowire to obtain a direct band gap. Here, we present a new strategy for controlling the electronic band structure of Si nanowires. Our method is attributed to the band structure modulation driven by uniaxial strain. We show that the band structure modulation with lattice strain is strongly dependent on the crystal orientation and diameter of SiNWs. In the case of [100] and [111] SiNWs, tensile strain enhances the direct band gap characteristic, whereas compressive strain attenuates it. [110] SiNWs have a different strain dependence in that both compressive and tensile strain make SiNWs; exhibit an indirect band gap. We discuss the origin of this strain dependence based on the band features of bulk silicon and the wave functions of SiNWs. These results could be helpful for band structure engineering and analysis of SiNWs in nanoscale devices.

Item Type:Article
Subjects:Physical Science > Nanoelectronics
Technology > Manufacturing processes for nanotechnology
Engineering > Nanotechnology applications in ICT
ID Code:1857
Deposited By:Farnush Anwar
Deposited On:16 Dec 2008 16:57
Last Modified:16 Dec 2008 16:57

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