Photoconductivities of α and β Forms of Metal -Free Phthalocyanine

Abstract

Some experimental results on the photoconductivities of α and β forms of metal ‐free phthalocyanine are presented and discussed. It is found that the photocurrent threshold energy is lower for the α sample than that for the β sample. The activation energies for dark conduction are about 1.9 ev for theβ sample and 1.4 ev for the α sample, while the activation energies for photoconduction are about 0.34 ev for the β and 0.42 ev for the α. All these differences are interpreted as due to the disordered structure of the α sample.