Abstract
A simple model for spin-dependent photoconductivity is presented based on rate equations for the density of spin pairs in singlet and triplet configuration. The pairs are formed by electrons localized in the conduction band tail and neutral dangling bonds (e—D°). We take into consideration thermally induced pair dissociation, spontaneous and microwave-induced spin flips and recombination by non-radiative tunneling from band tails into dangling bonds. Our model explains, satisfactorily, changes in line shape and the dependence of the signal intensity on defect density and microwave power. We conclude that tunneling dominates recombination even at 300 K. This recombination predominantly involves shallow band tail states.
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