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The structure of silicon quantum dots and key factors for emission in different environment

Huang Wei-Qi Lü Quan Wang Xiao-Yun Zhang Rong-Tao Yu Shi-Qiang

The structure of silicon quantum dots and key factors for emission in different environment

Huang Wei-Qi, Lü Quan, Wang Xiao-Yun, Zhang Rong-Tao, Yu Shi-Qiang
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  • Received Date:  13 November 2009
  • Accepted Date:  05 March 2010
  • Published Online:  15 January 2011

The structure of silicon quantum dots and key factors for emission in different environment

  • 1. Key Laboratory of Photoelectron Technology and Application of Guizhou Province, Instituteof Nanophotonic Physics, Guizhou University, Guiyang 550025, China

Abstract: Silicon quantum dots fabricated by nanosecond pulse laser in nitrogen, oxygen or air environment have enhancement in photoluminescence emission. The stimulated emission was observed at about 700 nm. It is difficult to recognize the difference between the photoluminescence peaks from samples in different environments, which is because of the same structure of the electron states in the band gap for different samples. The calculation results show that the same structure of the localized states forms in the band gap when silicon dangling bonds on surface of quantum dots are passivated by nitrogen or oxygen. It is the localized states that could catch the electrons from the conduction band to form metastable states, which is the key factor to enhance photoluminescence emission.

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