Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 61: Organic Electronics and Photovoltaics I (jointly with CPP, DS, and HL)

O 61.5: Talk

Thursday, March 14, 2013, 10:45–11:00, H34

Impact of molecular weight on the intrinsic charge carrier mobility of Si-PCPDTBT:[C70]PCBM thin films — •Andreas Fritze¹, Andreas Sperlich¹, Andreas Zusan¹, Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — ²ZAE Bayern, 97074 Würzburg

We investigated the influence of the molecular weight on the performance of solar cells from solution processed Si-PCPDTBT:[C70]PCBM blends. A significant increase in the short circuit current density j_SC was found with increasing molecular weight of the polymer. To explain this behavior, we performed transient microwave conductivity (TRMC) experiments and found much higher intrinsic mobilities in thin films based on the higher molecular weight donor. In order to distinguish between the influence of intra- and intermolecular charge transport on the obtained intrinsic TRMC mobility, we used two different solvents to influence the molecular environment in the film. We discuss our findings in view of the impact of the local order, influenced by the molecular weight on the performance of organic solar cells.