Properties of a Cadmium Sulfide Photorectifier

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Abstract
Measurements on a CdS photorectifier show it to have a high resistance in both the forward and reverse directions in the dark. Under illumination considerable conductivity in the forward direction is observed. Light to dark current ratios of 106 have been observed. The spectral response of the cell shows two peaks, one at the absorption cutoff the other at 5600 A with the sensitivity tailing off toward the red and infrared. The gain of the cell measured as a function of radiation intensity can be expressed empirically as a double exponential. The mechanism of the cell is explained on the basis of a model involving the formation of a quasi‐intrinsic region by diffusion of the barrier into the crystal.