Piezoelectric Effects in Selenium Rectifiers

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Abstract
Piezoelectric effect and inverse piezoelectric effect of a selenium rectifier, which are induced by ac strain and ac voltage, respectively, are studied. The piezoelectric effect changes with backward bias voltage, but the inverse effect is rather independent of the bias voltage. These effects are ascribed to the piezoelectricity of selenium crystals and the ordering of polycrystals at a barrier layer of the rectifier. The piezoelectric effect is more useful for the detection of ac strain of high frequency than the piezoresistive effect of semiconductor diodes.

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