THERMALLY STIMULATED CURRENT OF METALLOPH THALOCYANINE DISPERSED SYSTEMS

Thermally stimulated current (TSC) of metallophthalocyanine dispersed in polyester (PEs) resin was measured and the photoconduction mechanis m was discussed in relation to the carrier trapping and detrapping pro cesses. The relaxation current from the polarized resin and the TSC pe aks due to carriers trapped on the eigenlevels by light irradiation we re observed. In the case of a TSC peak made up by the superposition of various trapping levels, it was shown that they can be estimated with a curve fitting method by the algebraic sum of several theoretical TS C curves. The magnitude of the TSC peak current strongly depends on th e wavelength of irradiation light. The carrier trapping levels were es timated from the TSC results. The distribution of the trapping levels in (oxo) (phthalocyanato) titanium(N) (TiO(pc))/PEs systems was found to be influenced by the size, inter-particle distance and crystal form of the TiO(pc) particles. It was concluded that the trapping site wer e formed on the surface of the TiO(pc) particles and/or at the interfa ce between TiO (pc) and PEs.