Abstract
Abstract The dependence of rise and decay time of photocurrent on the applied voltage, sample temperature and incident light intensity has been studied for a new series of merocyanine dyes (six in numbers). The samples were prepared in thin film form on a multi-electrode raster type surface cell by vacuum deposition. Two orders of magnitude difference was found in the photocurrent when the samples were studied in air and vaccum of the order of 10−5 Torr in the conductivity cell. Rise and decay times were found to be less in vacuum. At higher temperatures, the photocurrent more rapidly approaches its stationary value because the ratios of concentrations of filled traps and free carriers (nt/n and pt/p) decrease as the temperature is increased. The dyes were found to behave as p-type semiconductors.
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