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Chin. Phys. B, 2012, Vol. 21(10): 107802    DOI: 10.1088/1674-1056/21/10/107802
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Structural and band tail state photoluminescence properties of amorphous SiC films with different amounts of carbon

Fu Guang-Sheng, Wang Xin-Zhan, Lu Wan-Bing, Dai Wan-Lei, Li Xing-Kuo, Yu Wei
College of Physics Science and Technology, Hebei University, Baoding 071002, China
Abstract  Amorphous silicon carbide films are deposited by the plasma enhanced chemical vapour deposition technique, and optical emissions from the near-infrared to the visible are obtained. The optical band gap of the films increases from 1.91 eV to 2.92 eV by increasing the carbon content, and the photoluminescence (PL) peak shifts from 1.51 eV to 2.16 eV. The band tail state PL mechanism is confirmed by analysing the optical band gap, PL intensity, the Stocks shift of the PL, and the Urbach energy of the film. The PL decay times of the samples are in the nanosecond scale, and the dependence of the PL lifetime on the emission energy also supports that the optical emission is related to the radiative recombination in the band tail state.
Keywords:  amorphous silicon carbide      band tail state photoluminescence      time-resolved photoluminescence     
Received:  21 March 2012      Published:  01 September 2012
PACS:  78.66.Jg (Amorphous semiconductors; glasses)  
  78.55.-m (Photoluminescence, properties and materials)  
  78.47.jd (Time resolved luminescence)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60878040) and the Natural Science Foundation of Hebei Province, China (Grant Nos. F2012201007 and F2012201042).
Corresponding Authors:  Wang Xin-Zhan     E-mail:  xinzhan_wang@126.com

Cite this article: 

Fu Guang-Sheng, Wang Xin-Zhan, Lu Wan-Bing, Dai Wan-Lei, Li Xing-Kuo, Yu Wei Structural and band tail state photoluminescence properties of amorphous SiC films with different amounts of carbon 2012 Chin. Phys. B 21 107802

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