Abstract
Thermally Stimulated Conductivity (T.S.C.) has been investigated in evaporated thin films of four amorphous chalcogenides, As 4S 4, As 2S 3, As 2Se 3 and Se. A variety of trapping levels has been found in each material with energy levels in the range 0.3−0.7 eV. The technique has been extended by using the magnitude of the T.S.C. to investigate the mechanism of trapping by studying its dependence on a wide variety of experimental parameters, particularly the exposure time, illumination intensity and wavelength. A simple theoretical model is found that accounts for the experimental results and from which useful information about the material can be derived, notably the quantum efficiency at different photon energies and the trap density.
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