Accession Number : AD0622695

Title :   VACUUM-DEPOSITED CADMIUM SULFIDE THIN FILMS,

Corporate Author : HARRY DIAMOND LABS WASHINGTON D C

Personal Author(s) : AVIS,G. G. ; Boesman,W. C. ; Readey,D. W.

Report Date : 20 JUL 1965

Pagination or Media Count : 41

Abstract : Cadmium sulfides was vacuum-deposited onto glass substrates at approximately 0.00002 torr using electron beam heating. Initial resistivities were in the range 0.1 to 1 ohm-cm. After heating in vacuum at 360 to 370C for 1/2 hr, the resistivities increased to the range 0.3 to 300,000 ohm-cm. To correlate resistivity with crystal structure, the cadmium sulfide films were studied by means of X-ray and electron diffraction, and spectrophotometry. It was found that these cadmium sulfide films were hexagonal and highly oriented with the c-axis perpendicular to the plane of the substrate. Grain size perpendicular to the c-axis was much less than 100 A after deposition onto room-temperature substrates, and increased to 100 to 200 A in diameter after heat treatment. To determine the type of contact the commonly deposited metals make to cadmium sulfide, a mask changer was employed to allow the deposition of layerized arrays of metal-cadmium sulfide-metal in a single pumpdown. Aluminum, indium, silver, and gold were thereby deposited in several different electrode combinations. Combinations having aluminum as one (or both) of the electrodes exhibited rectifying characteristics; all other combinations exhibited ohmic characteristics. (Author)

Descriptors :   (*SEMICONDUCTING FILMS, VAPOR PLATING), (*CADMIUM COMPOUNDS, SULFIDES), VACUUM APPARATUS, ELECTRICAL RESISTANCE, HEAT TREATMENT, CRYSTAL STRUCTURE, SANDWICH CONSTRUCTION, ELECTRICAL PROPERTIES

Distribution Statement : APPROVED FOR PUBLIC RELEASE