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 I
2-doped PPV, two TSC peaks (P
1, P
2) were observed. The P
1 peak moves to the low-temperature side upon increasing the I
2 concentration. The P
2 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 P
1 and P
2 peak, respectively, regardless of the amount of dopant. It is assumed that the P
1 peak originates from electron traps formed by the effect of doped I
2 molecules. Moreover, it is considered that the localized center of the peak for undoped PPV and the P
2 peak for I
2-doped PPV is due to defects originally existing in PPV.
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