Accession Number : AD0625476

Title :   PHYSICAL RESEARCH ON PROPERTIES OF II-VI COMPOUND SEMI CONDUCTORS.

Descriptive Note : Final rept., Apr 62-Apr 65,

Corporate Author : BROWN UNIV PROVIDENCE R I METALS RESEARCH LAB

Personal Author(s) : Elbaum,Charles ; Lord,Arthur ; Truell,Rhon

Report Date : JUN 1965

Pagination or Media Count : 52

Abstract : The work described in this report was concerned primarily with ultrasonic and electrical measurements made on cadmium sulphide single crystals for the purpose of studying the interaction of high frquency stress waves with charge carriers. The temperature dependence of ultrasonic attenuation, above room temperature, was found to follow the predicted dependence on the density of thermally excited charge carriers. The generation of the second harmonic of an ultrasonic wave has been studied as a function of light intensity (density of charge carriers). The amplitude of the second harmonic generally increases initially with increasing light intensity and then reaches a saturation value or broad maximum. The general behavior of the second harmonic is quite complicated and it cannot at present be fitted with any simple formalism of nonlinear phenomena in solids. Measurements of electrical resistivity as a function of position in the sample and as a function of localized illumination reveal very substantial inhomogeneity in response to light of all the specimens studied thus far. The transducing properties of cadmium sulphide have been found to depend on heat treatment through the formation of surface films which can be mechanically removed and reformed. (Author)

Descriptors :   (*SEMICONDUCTORS, SOLID STATE PHYSICS), (*CADMIUM COMPOUNDS, SULFIDES), ULTRASONIC PROPERTIES, ELECTRICAL PROPERTIES, MECHANICAL WAVES, STRESSES, ULTRASONIC RADIATION, DAMPING, HARMONIC GENERATORS, TEMPERATURE, PIEZOELECTRIC EFFECT, ANNEALING

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE