Abstract
Experimental measurements of the spectral distribution of photoconductivity in single crystals of cadmium iodide have been compared with the distribution calculated from De Vore's theory to estimate the phenomenological parameters governing the photosensitivity of this material. For solution grown cadmium iodide crystals subjected to an excitation rate of 5 × 10 16 photons sec -1m -2 the lifetime of photo-electrons is of the order of 1.5 nsec and the surface recombination velocity is estimated to be of the order of 400 km sec -1. The photon energy corresponding to peak photoconductivity is 3.2 eV at 290°K. It decreases linearly with temperature at the rate of -1.5 × 10 -3 eV°K -1, which is similar to the temperature shift of the optical absorption edge. At peak photosensitivity, the photocurrent is proportional to the 0.7th power of the light intensity over two orders of magnitude of illumination intensity. The photocurrent-light intensity variation also depends on the photon energy. For the same value of photocurrent the rise and decay times are shorter for photocurrents excited by photons of higher energy.
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