Optical spectroscopy of silicon nanowires

... Optical spectroscopy of silicon nanowires Jifa Qi a, * , John M. White a , Angela M. Belcher a , Yasuaki Masumoto b a Department of Chemistry and Biochemistry, University of Texas, ... shows the Raman scattering spectra of the SiNWs and crystal silicon. A very sharp and Fig. 1. A typical SEM image of the morphology of aligned silicon nanowires of uniform diameter di...

Ngày tải lên: 16/03/2014, 15:06

... models. 4. Optical properties of SiNWs and GeNWs In Section 5 of the present paper, we aim to point out the importance of the many-body effects on the optica l re- sponse of some of the studied nanowires. ... axis of the wire. Further the possibility to modify their optical response as a function of their size has become one of the most challenging aspect of recent semic...

Ngày tải lên: 16/03/2014, 15:33

... char- acteristic of cubic silicon with a small impurity of silica. Reaction of silicon powder with activated car- bon in the absence of H 2 , by procedure (ii), yielded abundant quantities of SiNWs. ... to the (1 1 1) planes of silicon. The crystallinity of the nanowires is con- siderably higher when only argon was used instead of a mixture of argon and hydrogen. The...

Ngày tải lên: 16/03/2014, 15:04

... HRTEM image of Si nanowire using Au. (d) HRTEM image of Si nanowire using Pt. Both were single crystal. (e) EDS line mapping of Si nanowires using Au catalyst. (f) EDS line mapping of Si nanowires ... show that the Si nanowires are sin- gle crystalline, without any structural defects. Alloy globules of Pt–Si or Au–Si were formed at the tips of the nanowires. An energy dispe...

Ngày tải lên: 16/03/2014, 15:05

... oxide exceeded the growth rate of crystal silicon, outer layer of silicon oxide will surround the crystal sil- icon. As a result, the growth of crystal silicon ceased and silicon oxide of outer layer coalesced together ... The peculiar feature of the branch suggests that there may exist a competitive growth between crystal silicon core and outer layer of silicon oxide....

Ngày tải lên: 16/03/2014, 15:09

... °C. Silicon nanowires produced at this temperature have a well-crystal- lized silicon core with a very thin amorphous sili- con dioxide outer layer. The length of the nanowires is in the range of ... and quality of the products obtained as a function of temperature. Ó 2003 Elsevier B.V. All rights reserved. 1. Introduction Silicon nanowires (SiNWs) have been widely studied...

Ngày tải lên: 16/03/2014, 15:09

... the catalytic growth. However, the growth of silicon nanowires with sulfide is chiefly affected by the compound decomposition, gas stream, and temperature difference. Silicon nanowires fabricated with metal ... typical sample of synthesis of SiNWs without a metal catalyst [17]. In this case, the SiO x vapor decomposes into Si atoms, which act as the nuclear of SiNWs covered by...

Ngày tải lên: 16/03/2014, 15:09

... 200030, People's Republic of China b State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, People's Republic of China c Department of Physics, Zhejiang University, ... Sample-III was grown on a p-type (111) silicon wafer with a resistivity of ∼ 0.001 Ω cm at the position of higher temperature in the same system of Sample-II. The diameter of th...

Ngày tải lên: 16/03/2014, 15:11

... silicon nanowires were synthesized for solar cells application. Voluminous silicon nanowires were fabricated on single crystalline silicon wafer. Optical reflectance and solar cell efficiency of ... the synthesized silicon nanowires were explored. The reflectance of as-synthesized silicon nanowires was obtained approximately 5% in the short wavelength region (λb 500 nm)....

Ngày tải lên: 16/03/2014, 15:12

... Synthesis of silicon nanowires after hydrogen radical treatment Minsung Jeon ⁎ , Koichi Kamisako Department of Electronic and Information Engineering, Tokyo University of Agriculture and ... the well-known nanotubes and nanowires, have been utilized extensively in the various fields of nanoscale optical and electronic devices [2–5]. In particular, silicon nanowires (SiNWs) a...

Ngày tải lên: 16/03/2014, 15:13