SURFACE-MORPHOLOGY AND OPTICAL-PROPERTIES OF ZNSIN FILMS

ZnS films were prepared by the hot wall evaporation technique onto gla ss substrates at various temperatures in order to determine the optimu m deposition conditions for preparation of stoichiometric films. The f ilms predominantly had the zinc blende structure, and the surface roug hness was found to decrease with increasing deposition temperature. In dium doping was found to increase the carrier concentration by one ord er of magnitude. The built-in electric field and mechanical stress wer e found to play an important role in describing the absorption tail in these polycrystalline films. The values of the density of trap states and the barrier height at the grain boundaries were determined.