ACOUSTOELECTRIC OSCILLATIONS, CURRENT SATURATION AND ELECTRON DRIFT MOBILITY IN CADMIUM SULPHIDE CRYSTALS,
FORSVARETS FORSKNINGSINSTITUTT KJELLER (NORWAY)
Pagination or Media Count:
Interaction between acoustic waves and conduction electrons in the piezoelectric semiconductor CdS is considered. A short theoretical discussion of acoustic amplification, current saturation and the temperature dependence of electron drift mobility is given. Current saturation due to acoustic oscillations in CdS is observed, both in a transverse mode and in a longitudinal mode. A method for determining the threshold field for oscillation, utilizing the build up time for current saturation under applied pulsed dc electric field, is discussed. The threshold field is used to determine the electron drift mobility for photoconducting CdS in the temperature range from 204 degrees K to 438 degrees K. The temperature dependence of the mobility can be described as a combination of scattering from lattice vibration and trapping by two impurity levels.
- Solid State Physics