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- W2040750097 abstract "Dispersive transport experiments in a-Si:H and a-As2Se3 have shown that current resulting from excess carriers is limited by multiple trapping in an exponential density of states. In this paper, the relationship between steady-state photoconductivity and the transient phenomena is explored. Because of the exponential density of states, the well-known Gγ dependence is expected for steady state, where G is the excitation density. The power γ is related to the dispersion parameter, α, by γ = (1 + α)−1. It is predicted that, in the approach to steady state, the current rises as tα. When the recombination coefficient, br, is much greater than the trapping coefficient bt, the current is predicted to exceed the steady-state value by a factor, which depends on brbt and α, before settling down to the steady level. The time of the maximum and the time to reach steady state are predicted to vary as G−γ. After reaching steady state, when the excitation is turned off the current is predicted to decay as t−α for the same amount of time as is required to reach steady state when the light is turned on. After this time, the current is predicted to decay as t−1. A number of important parameters characterizing transport and recombination in a multiple trapping system can be obtained from the approach to and decay from steady state." @default.
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- W2040750097 date "1982-11-01" @default.
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- W2040750097 title "The relationship between transient and steady-state photoconductivity in amorphous semiconductors" @default.
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- W2040750097 doi "https://doi.org/10.1016/0165-1633(82)90049-1" @default.
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