Influence of thermal treatment on photoconductive properties for TiOPc/SAN composites

摘要

Recently the stability of photoconductive properties and reliability of photoconductive devices composed of polymeric materials have attracted researcher's attention because of the academic interests and increasing commercial applications [1]. For some photoconductive composites containing phthalocyanines, the photoconductivity is strongly influenced by the presence of some impurities, like oxygen [2, 3] and also depends on electron donors and acceptors [4]. On the other hand, it was reported that humidity had influence on the photoconductivity of titanyl phthalocyanine (TiOPc) dispersed in polymer matrix, and the existence of H_2O could increase the photosensitivity of charge generation material, such as TiOPc [5, 6]. Lately we have found that photoconductive performance of titanyl phthalocyanine/poly (styrene-co-acryalonitrile) (TiOPc/SAN) prepared by coating was partly related to thermal-treatment conditions, because the content f residual tetrahydrofuran (THF) solvent in films during preparation was changed. The present article studies the effect of thermal treatment on photoconductive properties of TiOPc/SAN films on their photosensitivity (1/t_(1/2)) and the charging voltage (V_0).