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Abstract
The photoelectret properties of vacuum evaporated CdS films on Pyrex glass plate have been studied. The deposition conditions were controlled to obtain high resistivity CdS films (resistivity of the order of 10 7 Ω cm). The photoelectret polarization was carried out by simultaneous application of electric field and white light illumination from tungsten lamp source. The polarization exhibits the linear dependence upon the polarizing voltage and polarizing time, with saturation effects for large values of these parameters. The polarization in films is found to be four orders of magnitude higher than the corresponding value in thick CdS crystals or powders. The dark depolarization current decay is very slow, and time for current, to decay to approximately half of its initial value varies between 1 and 8 min. This large decay time is correlated to the presence of deep trap levels in the CdS films. The study is of significance to improve the performance of thin film CdS devices.
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