Accession Number : AD0603611

Title :   ACOUSTIC AMPLIFICATION AND ELECTRON MOBILITY IN LITHIUM AND SODIUM DOPED CADMIUM SULFIDE.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Hubbard,John Allen

Report Date : JUN 1964

Pagination or Media Count : 82

Abstract : The acoustic amplification, drift mobility and Hall mobility were measured in thirteen cadmium sulfide crystals to determine the effect of impurities on these properties. Ten of the measured crystals were grown doped with lithium, sodium or a combination of both sodium and lithium and three crystals were grown undoped. The undoped crystals have a maximum acoustic gain of about 70 db/cm, a Hall mobility of 170 sq cm/volt-sec and a drift mobility of 160 sq cm/volt-sec. The lithium doped crystals have a maximum gain of about 100 db/cm, a Hall mobility of 300 sq cm/volt-sec and a drift mobility of 100 sq cm/volt-sec. The sodium doped crystals have a maximum gain of 3 db/cm, a Hall mobility 100 sq cm/ volt-sec and a drift mobility of 50 sq cm/volt-sec. The sodium-plus-lithium doped crystals have a maximum gain of about 25 db/cm, a Hall mobility of 200 sq cm/volt-sec and a drift mobility of 150 sq cm/volt-sec. The measurements indicate that impurities in the crystal can either increase or reduce the acoustic amplification and impurities increase electron trapping within the crystal, thus reducing the drift mobility. (Author)

Descriptors :   (*IMPURITIES, SEMICONDUCTORS), (*SEMICONDUCTORS, ACOUSTIC PROPERTIES), (*PIEZOELECTRIC CRYSTALS, ELECTRICAL PROPERTIES), (*CADMIUM COMPOUNDS, SULFIDES), CRYSTALS, LITHIUM, SODIUM, CRYSTAL GROWTH, ELECTRONS, DRIFT, HALL EFFECT, GAIN, ATTENUATION, MEASUREMENT, CONDUCTIVITY, DELAY LINES, PULSE AMPLIFIERS, AMPLIFIERS

Distribution Statement : APPROVED FOR PUBLIC RELEASE