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- W2049201853 abstract "It is universally found that the photoelectronic properties of a-Ge:H and a-Si1−xGex:H alloys are much poorer than those of a-Si:H. For example, the efficiency mobility-lifetime products from steady-state photoconductivity measurements and the mobility-lifetime products from time-of-flight data decrease by about a factor of 100 between a-Si:H and a 50% Ge alloy. Estimates of the gap density-of-states from spin resonance or optical absorption, however, indicate increases of only an order of magnitude, and measurements of the Urbach tail parameter show essentially no change throughout the alloy series. There would appear to be a growing consensus that these results are reconciled by a model of a rapidly decreasing electron mobility with alloying. This paper examines the evidence for this, and discusses how the details of the results for steady-state and transient photoconductivity may be understood." @default.
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- W2049201853 date "1993-12-01" @default.
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- W2049201853 title "The mott lecture. Structural and electronic properties of amorphous SiGe:H alloys" @default.
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- W2049201853 doi "https://doi.org/10.1016/0022-3093(93)90479-h" @default.
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