Abstract
It is shown that a blocking contact on a-As2Se3 becomes injecting upon trapping photogenerated electrons. The blocking contact consists of a thin organic insulator layer between a semitransparent gold anode and the photoconductor. Gains exceeding unity have been observed. The dynamics of the blocking-to-injecting contact transition have been investigated, and its process has been interpreted in terms of thermally assisted tunneling. This effect, in which one observes a blocking contact and an injecting contact in one sample, allows one to study both the primary and the conduction photocurrents in a sequential manner in a-As2Se3. Applying this technique, the steady-state photoconductivity of a-As2Se3 has also been investigated in detail. The results of the steady-state photocurrent measurements are examined in terms of the classical photoconductivity theory.
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