Time-of-flight measurements of the photocurrent in thin organic semiconductor layers represent an effective way to extract charge carrier mobility. A common method to interpret the time-dependence of the photocurrent in these material systems assumes a position-independent electric field between two coplanar electrodes. In this letter, we compare time-dependence of the photocurrent, measured in the samples comprising thin layers of poly-3-hexylthiophene, with the Monte Carlo simulations. In the simulations, we have used both, a position-independent and a position-dependent electric field. We obtained a favorable agreement between the simulations and the measurements only in the case of position-dependent electric field. We demonstrate that the charge carrier mobility may be underestimated by more than one order of magnitude, if a position-independent electric field is used in the calculations of the mobility.
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27 August 2012
Research Article|
August 29 2012
Time-of-flight mobility of charge carriers in position-dependent electric field between coplanar electrodes
Egon Pavlica;
Egon Pavlica
Laboratory of Organic Matter Physics,
University of Nova Gorica
, Vipavska 13, SI-5000 Nova Gorica, Slovenia
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Gvido Bratina
Gvido Bratina
a)
Laboratory of Organic Matter Physics,
University of Nova Gorica
, Vipavska 13, SI-5000 Nova Gorica, Slovenia
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a)
Author to whom correspondence should be addressed. E-mail: [email protected]. Tel.: +386 5 365 35 00. Fax: +386 5 365 35 27.
Appl. Phys. Lett. 101, 093304 (2012)
Article history
Received:
June 07 2012
Accepted:
July 18 2012
Citation
Egon Pavlica, Gvido Bratina; Time-of-flight mobility of charge carriers in position-dependent electric field between coplanar electrodes. Appl. Phys. Lett. 27 August 2012; 101 (9): 093304. https://doi.org/10.1063/1.4742149
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