Characteristics of photocurrent multiplication phenomenon occurring at an organic perylene pigment/metal interface were revealed to be drastically influenced by the morphology of metal films. When a deposited Au film formed an imperfect contact with a microscopically rough pigment surface, the organic/Au junction exhibited a large photocurrent multiplication exceeding 104-fold. In contrast, when an Au film closely stuck to the pigment surface, the organic/Au junction exhibited slight photocurrent multiplication. The present results support the existence of a large number of blind alleys at organic/metal interfaces, acting as structural traps which capture the photogenerated holes as a trapped space charge. These traps build up an intense electric field at an organic/metal interface and trigger tunneling electron injection from the Au electrode to yield the large photocurrent multiplication.
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Hiramoto et al. (1998) studied this question.
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