Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 15: Joint Session: Organic Semiconductors I: Solar Cells A

HL 15.12: Talk

Monday, March 14, 2011, 17:15–17:30, ZEU 222

Time resolved microwave conductivity reveals charge carrier dynamics in organic semiconductors — •Johannes Erben¹, Andreas Sperlich¹, Hannes Kraus¹, Tom J. Savenije^1,3, Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Julius-Maximilians-University of Würzburg, D-97074 Würzburg — ²ZAE Bayern, D-97074 Würzburg — ³Department of Chemical Engineering, Delft University of Technology, NL-2628 BL Delft, The Netherlands

Understanding of the light induced charge carrier dynamics in organic semiconductors is essential to improve material properties and processing parameters, and, at long sight, device performance. Time Resolved Microwave Conductivity (TRMC) gives direct access to the microscopic transport properties, as the high frequency alternating electric field limits the drift of the charge carriers. After laser pulse excitation TRMC signal decays in P3HT:PCBM blends with varying PCBM content have been observed exhibiting a power law time dependence. The influence of morphology and temperature on the charge carrier recombination and mobility on a microscopic scale can thus be investigated.