Abstract
ON the evidence of the dependence of electric conductivity upon temperature, Eley1 and Vartanyan2 reached the same conclusion, namely, that both phthalocyanine and its metallic derivatives should be regarded as kinds of semiconductors. In this connexion we wish to report that copper phthalocyanine exhibits the following photoelectric phenomena: (1) photoconductivity, (2) generation of electromotive force, and (3) change of the surface potential, both (2) and (3) being induced by illumination.
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