Raman scattering and electrical characterizations studies of hydrogenated amorphous silicon-germanium alloys prepared by 40 MHz plasma-enhanced CVD

  • Chen Y
  • Fang H
  • Yeh C
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Abstract

This paper presents results on Raman scattering and electrical characterizations in a-SiGe:H films prepared by 40 MHz very-high frequency plasma-enhance chemical vapor deposition (VHF-PECVD) technique from various gas mixtures of silane and germane. We found that when GeH4/SiH4+ GeH4ratio increases, Raman spectrum results observed that the Si-Si peaks intensity decreases and the Ge-Ge peaks intensity increase, respectively. This can be attributed to incorporation of Ge, an increase disorder in a-SiGe:H film. The conductivity characterizations were shown that when GeH4/SiH4+ GeH4ratio increases, the deterioration of a-SiGe:H films also increases, which is in agreement with Raman spectrum analysis results. © 2010 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Conductivity
  • Hydrogenated amorphous silicon-germanium
  • Raman spectrum

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Authors

  • Yu Hung Chen

  • Hsuan Yin Fang

  • Chun Ming Yeh

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