Physics – Condensed Matter – Materials Science
Scientific paper
2009-07-09
Physical Review B 81, 035209 (2010)
Physics
Condensed Matter
Materials Science
15 pages, 9 figures
Scientific paper
10.1103/PhysRevB.81.035209
The method of current extraction under linear increasing voltages (CELIV) allows for the simultaneous determination of charge mobilities and charge densities directly in thin films as used in organic photovoltaic cells (OPV). In the past, 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.
Bange Sebastian
Neher Dieter
Schubert Marcel
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