Two-photon photogeneration has been observed in amorphous selenium. The field dependence of this uniform bulk photogeneration process saturates at low fields and fits a Poole-Frenkel model down to 300 V/cm. The previously reported strong field dependence of the generation efficiency at low fields for strongly absorbed light is attributed to surface recombination.
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R. C. Enck (1973) studied this question.
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