Accession Number : AD0695115

Title :   ACOUSTOELECTRIC EFFECTS IN SEMICONDUCTING TRANSDUCERS,

Corporate Author : MCGILL UNIV MONTREAL (QUEBEC) EATON ELECTRONICS LAB

Personal Author(s) : Adler,E. L.

Report Date : 26 JUN 1968

Pagination or Media Count : 5

Abstract : In piezoelectric semiconductors, the presence of free carriers gives rise to acoustic damping, thus reducing their effectiveness as electromechanical transducers. By drifting the carriers with supersonic velocities, acoustoelectric effects associated with acoustic amplification are found to alter the energy conversion process. The conversion of energy for a structure consisting of a semiconducting transducer loaded at one face by a delay rod is analyzed, and the results of calculations for the transducer gains showing the effect of drift velocity, resistivity, and load impedances are described. For light mechanical loads and supersonic carrier drift velocity, improvements in both detection and generation performance are obtained, transducer gains become positive in the vicinity of mechanical resonances giving net electronic gain, and acoustoelectric instabilities occur. (Author)

Descriptors :   (*SEMICONDUCTOR DEVICES, PIEZOELECTRIC CRYSTALS), (*ELECTROACOUSTIC TRANSDUCERS, PERFORMANCE(ENGINEERING)), SEMICONDUCTING FILMS, ELECTRIC FIELDS, ZINC COMPOUNDS, OXIDES, CANADA

Subject Categories : Electrical and Electronic Equipment
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE