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Study on Optical Constants of a-SiGe_x:H Alloys

Zhang Fangqing Guo Yongping Song Zhizhong Chen Guanghua (Department of Physics,Lanzhou University,730001)  
the optical constants (the refractive index and the extinction coefficient) of a-SiGe_x:Halloys have been accurately determined by reflection and transmission measurements using(1-R)/T and (1+R)/T instead of R and T.The effect of different germanium atom contents onthe optecal constants of the specimens has been investigated.The changes of structure andoptical characteristics of a-SiGe_x:H alloys,which relate to doping of germanium atoms,havealso been discussed.
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