Thermally-stimulated currnt (TSC) in poly (p-phenylene vinylene) (PPV) and its doping effect were studied. TSC peak in undoped PPV is observed at around 60°C. The activation energy was evaluated as 0.5eV. In I2-doped PPV, two TSC peaks (P1, P2) were observed. The P1 peak moves to the low-temperature side upon increasing the I2 concentration. The P2 peak was observed in the same temperature range as the peak in undoped PPV. The activation energies were evaluated as 0.2 and 0.4eV for P1 and P2 peak, respectively, regardless of the amount of dopant. It is assumed that the P1 peak originates from electron traps formed by the effect of doped I2 molecules. Moreover, it is considered that the localized center of the peak for undoped PPV and the P2 peak for I2-doped PPV is due to defects originally existing in PPV.
