CARRIER CONCENTRATION AND MOBILITY IN CHEMICALLY SPRAYED CADMIUM-SULFIDE THIN-FILMS

Thermoelectric and photothermoelectric measurements were used to study the effects of film thickness on the electronic properties of chemically sprayed cadmium sulphide films. All the films had high carrier concentrations and low dark mobilities. The dark mobility increased with film thickness and was accompanied by a noticeable increase in the grain size. No attempt was made to identify the mechanism responsible for the low dark mobility of the thinner films, although the results of the heat treatment seemed to indicate that some form of chemisorption of gases could be responsible. The films of thickness greater than 2 μm had large grains and were only moderately photosensitive. They were chemically and structurally more stable and seemed to be more resistant to environmental effects than the thinner films. © 1979.