Negative Photoconductivity in Cd_1-xZn_xS Films Prepared by Precipitation from Aqueous Solutions

摘要

Negative photoconductivity is studied in Cd_1-xZn_xS films 8-10 μm thick prepared on glass-ceramic substrates by precipitation form aqueous solutions containing cadmium chloride, zinc chloride, thiourea, and a complexing agent. The films were characterized by spectral, x-ray diffraction, and chemical analyses. Under illumination, the photocurrent first rises almost linearly with incident intensity and then saturates. The results are interpreted in terms of a potential barrier for carrier drift.