Abstract
Pre-exposure of lead-doped AgBr binderless powder precipitates to several seconds of light greatly enhanced the microwave photoconductivity at 100K. Photon energies both greater and less than the bandgap of pure AgBr could produce such an effect. The dependence of pre-exposure enhancement on wavelength and intensity and the effect of pre-exposure on photoelectron kinetics were observed. The results suggest that the increase in photoconductivity is caused by two different mechanisms, depending on whether the photon energy is greater or less than the pure AgBr energy gap. It appears that pre-exposure can affect the processes involved in photoelectron generation as well as electron decay mechanisms.
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