A large photocurrent multiplication due to hole injection reaching 2500-fold was observed in organic p-type quinacridone pigment films. This phenomenon was revealed to be due to photoinduced excess hole injection from a positively biased metal electrode to the p-type organic film through its depletion layer under a high electric field, which is built up by the photo-accumulation of trapped electrons near the interface. This is a clear example that the reverse mechanism to the photoinduced electron injection observed for n-type organic pigment film can occur in p-type organic pigment film.
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Hiramoto et al. (1996) studied this question.
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