Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 38: Organic Photovoltaics and Electronics (joint session CPP/HL, organized by HL)
CPP 38.2: Vortrag
Mittwoch, 9. März 2016, 15:15–15:30, H2
Non-Equilibrium Charge Carrier Dynamics in Organic Disordered Semiconductors — •Andreas Hofacker1, Jan Oliver Oelerich2, Alexey Nenashev3, Florian Gebhard2, and Sergei Baranovskii2 — 1Institute of Applied Photophysics, Dresden University of Technology, D-01069 Dresden — 2Department of Physics and Materials Science Center, Philipps-University, D-35032 Marburg — 3Institute of Semiconductor Physics, 630090 Novosibirsk, Russia
Time-dependent processes in organic semiconductors dominated by non-equilibrium physics are subject of current debate in the scientific community. The understanding of these processes promises fundamental insights into transport and recombination dynamics of charge carriers in organic semiconductor devices such as organic solar cells, and can therefore reveal possibilities for further efficiency enhancement.
Based on an analytical model developed for inorganic disordered semiconductors by Orenstein and Kastner in 1981, we formulate a description of carrier thermalization and recombination in organic disordered semiconductors. For this purpose we extend the very transparent approach of Orenstein and Kastner to enable the description of low recombination rates and applicability of the approach to arbitrary density of tail states (DOS) functions. We predict that the behavior of systems with a Gaussian DOS, which organic semiconductors are commonly believed to be, is distinctively different from systems with an exponential DOS. This fact could be used to experimentally distinguish whether a given sample possesses an exponential or a Gaussian DOS by performing a time-dependent carrier density measurement.