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Modeling of the transient mobility in disordered organic semiconductors


These file attachments have been under embargo and were made available to the public after the embargo was lifted on 31 October 2011.

Author: Germs, W.C. (Univ. Eindhoven) · Van der Holst, J.M.M. (Univ. Eindhoven) · Van Mensfoort, S.L.M. · Bobbert, P.A. (TU/e) · Coehoorn, R.
Embargo lifted:2011-10-31
Publisher: APS (American Physical Society)
Institution: Philips Research
Source:Physical Review Letters; authors version
Identifier: MS 32.308
Keywords: carrier relaxation time · oled · oled device model · oled modelling
Rights: (c) APS (American Physical Society)


In non-steady-state experiments, the electrical response of devicesbased on disordered organic semiconductors often shows a large transient contribution due to relaxation of the out-of-equilibrium charge-carrier distribution. We have developed a model describing this process, based only on the parameters describing the d.c. mobility andon Monte Carlo calculations of the effective conduction energy level. The model successfully predicts the relaxation-enhancement of thedifferential capacitance of sandwich-type devices based on a polyfluorene-copolymer. Generalization of the approach is expected to enable efficient modeling of relaxation effects in other types of experiments.

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