Photosensitive-Ultrasonic Properties of Cadmium Sulfide

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Abstract
Ultrasonic attenuation in single crystals of CdS has been observed to be a function of light irradiation. Two distinct types of behavior have been observed. Some crystals (type A) show a decrease of attenuation with white light application, and others (type B) show an increase of attenuation with white light. The ultrasonic attenuation and the conductance of the crystals were measured as a function of temperature. An excellent correlation between the conductance and the ultrasonic attenuation is evident for type B crystals. A strong correlation between the directional piezoelectric properties of CdS and the ultrasonic attenuation in both types of CdS is also shown. An interaction between conduction electrons and stress waves coupled by the piezoelectric property of CdS is isolated as the dominant mechanism for the photosensitive ultrasonic attenuation in CdS of type B. Two or more competing effects appear to be responsible for the type A photosensitive attenuation behavior.