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

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 puri...

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Bibliographic Details
Published in:Journal of applied physics 2010-06, Vol.107 (12), p.124504-124504-5
Main Authors: 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.
Format: Article
Language:English
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Summary: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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3432744