Thermally Stimulated Current of Metallophthalocyanine Dispersed Systems

Abstract

Thermally stimulated current (TSC) of metallophthalocyanine dispersed in polyester (PEs) resin was measured and the photoconduction mechanism was discussed in relation to the carrier trapping and detrapping processes. The relaxation current from the polarized resin and the TSC peaks due to carriers trapped on the eigenlevels by light irradiation were observed.
In the case of a TSC peak made up by the superpos ition of various trapping levels, it was shown that they can be estimated with a curve fitting method by the algebraic sum of several theoretical TSC curves. The magnitude of the TSC peak current strongly depends on the wavelength of irradiation light. The carrier trapping levels were estimated from the TSC results. The distribution of the trapping levels in (oxo) (phthalocyanato) titanium (IV) (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 were formed on the surface of the TiO(pc) particles and / or at the interface between TiO(pc) and PEs.