Temperature dependence of photo-charge generation of polymeric photorefractive composite in the glass transition temperature region

For photo-charge generation of polymeric photorefractive (PR) composites, temperature is important factor with electric field, but no study for temperature dependence of photo-charge generation efficiency (φ) at the glass transition temperature (Tg) region has been done yet. In this work, we investigate the temperature dependency of φ of a low Tg PR composite. With increasing temperature the photo-charge generation efficiencies increased below Tg but decreased above Tg. This behavior could be attributed to temperature dependence of heat capacity and the dielectric constant of PR composite. The space charge field was strongly dependent on temperature and increased with increasing φ.