Berlin 2005 – wissenschaftliches Programm

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SYOO: Organic Optoelectronics and Photonics

SYOO 6: Poster

SYOO 6.33: Poster

Montag, 7. März 2005, 18:00–20:00, Poster TU A

Concentration dependence of field effect mobility in methano fullerene : polythiophene blends — •Elizabeth von Hauff, Vladimir Dyakonov, and Jürgen Parisi — Carl-von-Ossietzky University of Oldenburg, Faculty V, Institute of Physics, Department of Energy and Semiconductor Research, C-v-O Str. 9-11, 26129 Oldenburg, Germany

We report on the dependence of the field effect mobility of electrons and of holes on the concentration of methanofullerene (PCBM) in the PCBM: polythiophene (P3HT) blends typically used in polymer solar cells. The electron mobilities in pure PCBM and the hole mobilities in P3HT are roughly balanced, and in the order of 10⁻³ cm²/Vs, whereas in the 2:1 (PCBM:P3HT) blends, the mobilities of both charge carriers are found to lie a factor of 10 lower. In this study, the concentration of PCBM was varied in the blends from half to over double the weight ratio of P3HT in the blend, and the effect of the PCBM concentration on the charge carrier mobilities in the blend was investigated. The effect of thermal treatment, known to be essential for solar cell performance, was investigated in P3HT films and PCBM:P3HT blends for its influence on the field effect mobility. In pure P3HT and PCBM:P3HT blends, a five fold increase in the hole mobility was observed.