Abstract
The present paper reports on steady state and transient photoconductivity measurements in amorphous thin films of Se0.8Te0.2. The paper also reports the effect of crystallization on the photoconductive behaviour. The photosensitivity(Iph/Id) reduces by a factor of 5 and the decay of photocurrent becomes much slower in the films annealed above the crystallization temperature (state B) as compared to the films annealed below the crystallization temperature (state A). A detailed analysis of the photoconductive decay in the state B shows that the recombination within localized states may be the predominant recombination mechanism in this state.
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