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Nanotechnology. 2011 Feb 18;22(7):075203. doi: 10.1088/0957-4484/22/7/075203. Epub 2011 Jan 14.

The synthesis and photoluminescence properties of selenium-treated porous silicon nanowire arrays.

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1
Department of Materials Science and Engineering, Key Laboratory of Advanced Materials, Tsinghua University, Beijing, People's Republic of China.

Abstract

Here we prepared vertical and single crystalline porous silicon nanowire (SiNW) arrays using the silver-assisted electroless etching method. The selenization was carried out by annealing the samples in vacuum with selenium atmosphere. The selenization treatment at 700 °C is useful for investigating the photoluminescence (PL) properties of porous SiNWs, with an enhancement of 30 times observed. The observed PL peaks blue-shift to 650 nm and the decomposition of the spectrum reveals that three PL bands with different origins are obtained. It is proved that selenization treatment could remove the Si-H bonds on the surface and form Si-Se bonds, which could increase the absorbance of the SiNWs and also enhance the stability of the PL intensity. These Se-treated porous SiNWs may be useful as nanoscale optoelectronic devices.

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