Charge mobility determination by current extraction under linear increasing voltages: Case of nonequilibrium charges and field-dependent mobilities

Sebastian Bange, Marcel Schubert, and Dieter Neher
Phys. Rev. B 81, 035209 – Published 26 January 2010

Abstract

The method of current extraction under linear increasing voltages (CELIV) allows for the simultaneous determination of charge mobilities and charge densities directly in thin-film geometries as used in organic photovoltaic (OPV) cells. It has been specifically applied to investigate the interrelation of microstructure and charge-transport properties in such systems. Numerical and analytical calculations presented in this work show that the evaluation of CELIV transients with the commonly used analysis scheme is error prone once charge recombination and, possibly, field-dependent charge mobilities are taken into account. The most important effects are an apparent time dependence of charge mobilities and errors in the determined field dependencies. Our results implicate that reports on time-dependent mobility relaxation in OPV materials obtained by the CELIV technique should be carefully revisited and confirmed by other measurement methods.

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  • Received 3 July 2009

DOI:https://doi.org/10.1103/PhysRevB.81.035209

©2010 American Physical Society

Authors & Affiliations

Sebastian Bange*, Marcel Schubert, and Dieter Neher

  • Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany

  • *Present address: University of Utah, Department of Physics and Astronomy, 115 South 1400 East #201, Salt Lake City, UT 84112-0830, USA; sbange@physics.utah.edu

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Vol. 81, Iss. 3 — 15 January 2010

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