Abstract
Measurement of the noise spectra of cadmium sulphide photoconductive cells from 10 to 10 Mc/sec has failed to reveal a transition from the 1/f to the 1/f2 noise frequency dependence. This clearly demonstrates a complete lack of dependence of the 1/f noise spectrum on the photoconductive time constant, which is approximately 30 milliseconds.No noise correlation has been observed, indicating a minority carrier lifetime of less than 10−7 seconds.The extreme difference between the minority carrier lifetime and the photoconductive time constant is explained by assuming that most of the recombination takes place at the surface of the film, but that the rate of recombination is controlled by diffusion. Slow diffusion of the minority carriers is a consequence of their very short lifetimes.The noise power and time constants of CdS have been observed to depend on the value of the series resistance used with the cell. The two effects are believed to be related and to arise from the presence of intercrystalline barriers.
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