Theory of the resonant and non-resonant photoconductivity changes in amorphous silicon

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Abstract
The resonant and non-resonant photoconductivity changes due to a magnetic field and an additional microwave field are ocnsidered. The effect is shown to bear a close relationship to the anomalous spin-dependent magnetoresistance observed in amorphous semiconductors. It is suggested that a spin-dependent, non-radiative recombination process is responsible for the resonant and non-resonant photo-conductivity changes. Interesting time-dependent effects are found; in particular microwave chopping can turn a quenching line into an enhancing one. The problems associated with exchange-coupled spins are discussed. We compare our results with our recent luminescence results and conclude that the same model can account for both experiments.