Regensburg 2010 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 67: Organic Semiconductors: Solar Cells II (Joint Session with DS/CPP/O)

HL 67.2: Talk

Friday, March 26, 2010, 10:30–10:45, H16

Hybrid solar cells based on semiconductor nanocrystals and poly(3-hexylthiophene) — •Holger Borchert, Florian Witt, Marta Kruszynska, Nikolai Radychev, Irina Lokteva, Folker Zutz, Marc Daniel Heinemann, Elizabeth von Hauff, Joanna Kolny-Olesiak, Ingo Riedel, and Jürgen Parisi — University of Oldenburg, Department of Physics, Energy and Semiconductor Research Laboratory, Carl-von-Ossietzky Str. 9-11, 26129 Oldenburg, Germany

Semiconductor nanoparticles are promising electron acceptor materials for polymer-based bulk heterojunction solar cells. Size-dependent optical properties enable adaptation of the absorption to the solar spectrum, and the possibility to use elongated nanoparticles should be favorable for efficient electron transport. Despite these potential advantages, efficiencies reported for such hybrid solar cells are still below those of organic polymer/fullerene cells. In the work to be presented, CdSe nanoparticles were prepared by colloidal chemistry and their usability for hybrid solar cells in conjunction with poly(3-hexylthiophene) (P3HT) as electron donor material was studied. Systematic studies of correlations between the device performance and blend morphology are presented. Furthermore, charge separation in the donor/acceptor systems was studied in detail by electron spin resonance (ESR) and photoinduced absorption spectroscopy (PIA). The studies revealed the existence of a large amount of trap states which might be the origin of the limitations for the device efficiency. First results with colloidally prepared CuInS2 nanoparticles are presented as well.