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Dispersive diffusion controlled distance dependent recombination in amorphous semiconductors

Kazuhiko Seki·Mariusz Wojcik·M. Tachiya
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Abstract

The photoluminescence in amorphous semiconductors decays according to power law $t^{-delta}$ at long times. The photoluminescence is controlled by dispersive transport of electrons. The latter is usually characterized by the power $alpha$ of the transient current observed in the time-of-flight experiments. Geminate recombination occurs by radiative tunneling which has a distance dependence. In this paper, we formulate ways to calculate reaction rates and survival probabilities in the case carriers execute dispersive diffusion with long-range reactivity. The method is applied to obtain tunneling recombination rates under dispersive diffusion. The theoretical condition of observing the relation $delta = alpha/2 + 1$ is obtained and theoretical recombination rates are compared to the kinetics of observed photoluminescence decay in the whole time range measured.

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Kazuhiko Seki, Mariusz Wojcik, M. Tachiya. 2005-11-29. Dispersive diffusion controlled distance dependent recombination in amorphous semiconductors. https://doi.org/10.1063/1.2161213

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