Abstract
The effect of grain boundary recombination on the photoconductance transient response, after excitation with a delta function light pulse near a grain boundary, is studied here. An analytical expression is derived for this decay which can be readily computed numerically. The photoconductance turns out to be a non-exponential function of time even at large decay times. A practical method, based on such non-exponential decay curves obtained with the light beam positioned away or near a grain boundary, is developed to deduce accurate value of the bulk lifetime and the grain boundary recombination velocity.
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