Abstract
In this paper, we have investigated the physical mechanisms for excitation wavelength and electric field-dependent charge carrier photogeneration in amorphous selenium (a-Se) under high electric fields. Although the photogeneration efficiency at low to moderate electric field in a-Se has been most successfully described by the conventional Onsager theory of dissociation, this theory fails at very strong electric fields (Reznik et al. in Appl Phys Letts 100:132101, 2012). We have proposed a formulation for calculating the excitation wavelength and electric field-dependent initial separation of the photogenerated and thermalized geminate electron and hole, and applied it to explain the field-dependent photogeneration efficiency in a-Se. We have also adapted the exact extension of the Onsager model in order to explain the experimental results at very strong electric fields.
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