A photoinduced reversible change in bulk resistance of polycrystalline AgI is observed at room temperature. The original yellow color of the sample changes to dark brown with UV (308 nm) photoirradiation, associated with the small decrease in the bulk resistance. A reversible switching of color between dark brown and yellow is observed by alternative UV-visible photoirradiation, associated with a switching between high and low resistance states. The observed reversible photoswitching is interpreted in terms of the photoinduced reversible change in the beta-gamma-polytype stacking structure of the polycrystalline AgI.
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Reversible photoswitching behavior in bulk resistance and in color of polycrystalline AgI at room temperature
APL_93_234102
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