It has been shown that the organic photo-semiconductor, copper-phenyl-acetylide (PAC) can be spectrally sensitized outside the range of its proper photo-response by several cationic, anionic and neutral organic dyes (methylene blue, pinacyanol, chlorophyll a, erythrosin, the phthalocyanines, hematin). Not only monomolecularly adsorbed dyes are efficient, but also dye dimers and its more aggregated forms. The proper photo-sensitivity of PAC is also changed by dye adsorption, either diminished, or enhanced. The results are discussed considering the signs of the photo-carriers, and a mechanism of the phenonemon suggested.
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Mylnikov et al. (1964) studied this question.
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