Abstract

The multiphonon nature of radiative and nonradiative recombination processes of various types in semiconductors extending from covalent to ionic crystals is described in terms of the electronic radius a and the multiphonon parameter S. Intrinsic and extrinsic self-trapping is considered from a unified view-point, with emphasis on the different roles of short and long range forces. Deep impurity states favorable for multiphonon nonradiative recombination, and some other impurity states with strong lattice distortion, are ascribed to extrinsic self-trapping. A speculation on the microscopic mechanism of defects formation, another conversion channel of recombination energy, is presented for the case of alkali halides.

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