Hysteresis-free electron currents in poly(p-phenylene vinylene) derivatives

作者：Craciun N I^*; Zhang Y; Palmaerts A; Nicolai H T; Kuik M; Kist R J P; Wetzelaer G A H; Wildeman J; Vandenbergh J; Lutsen L; Vanderzande D; Blom P W M

来源：Journal of Applied Physics, 2010, 107(12): 124504.

DOI：10.1063/1.3432744

The interpretation of electron currents in conjugated polymers is strongly hindered by the occurrence of hysteresis. We investigate the transport of electrons in electron-only devices based on derivatives of poly(p-phenylene vinylene) (PPV) for various hole-blocking bottom electrodes as well as purification of the polymer. The use of a variety of hole blocking bottom contacts, as metallic electrodes and n-type doped polymers, did not give any improvement in the observed hysteresis. By purification of the PPV, hysteresis free electron-only currents can be obtained. The deep traps responsible for hysteresis, with a concentration in the 10(16) cm(-3) range, are not responsible for the trap-limited electron transport as observed in purified PPV.

• 出版日期2010-6-15