抄録
The carrier mobilities and carrier transport mechanism of composite materials of TiO2 encapsulated in polymethylmethacrylate (C-PMMA-TiO2) were investigated by the Time-of-Flight (TOF) method. As the result, the drift mobility of C-PMMA-TiO2 increased as compared with that of TiO2, and its value showed a tendency to increase with an increase of encapsulating ratio. The increase of drift mobility of electrons became larger than that of holes. Since the dispersion parameter α showed the temperature dependence, it was considered that the mechanism of carrier transport in C-PMMA-TiO2 was the limited transport of carriers captured by the localized levels existing in an exponential distribution. Furthermore, it was found that the density of the localized level increased with increasing encapsulating ratio.
