Dresden 2009 – wissenschaftliches Programm

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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 1: Organic Photovoltaics I

SYOP 1.6: Vortrag

Mittwoch, 25. März 2009, 15:15–15:30, ZEU 222

Preparation of hybrid solar cells from CdSe nanocrystals and poly(3-hexylthiophene) — •Folker Zutz, Marc-Daniel Heinemann, Irina Lokteva, Joanna Kolny-Olesiak, Ingo Riedel, Holger Borchert, and Jürgen Parisi — University of Oldenburg, Department of Physics, Energy and Semiconductor Research Laboratory, Carl-von-Ossietzky Str. 9-11, 26129 Oldenburg, Germany

Colloidally prepared semiconductor nanocrystals with particle sizes of a few nanometers possess particular physical and chemical properties. One example is the size-dependent band gap which enables tuning of optical properties by controlling the particle size. One potential application is the use of nanocrystals as a component in hybrid solar cells. Similar to organic composites of polymer and fullerenes, a nanocrystal-polymer composite is a donor/acceptor system where photo-generated charge carriers can be efficiently separated because of the affinity of the nanocrystals and polymers to accept electrons and holes, respectively. In contrast to fullerenes, semiconductor nanocrystals can additionally act as absorber themselves. This offers possibilities to optimize the exploitation of the solar spectrum. In the present work, we prepared high-quality CdSe nanocrystals. Composites of the nanocrystals and polymere (P3HT) were successfully used to prepare laboratory solar cells which were characterized by I-V curves and measurements of the external quantum efficiency. Further experiments with different ratios of Cadmium to Selenium in the nanocrystals and different ratios of CdSe nanocrystals to polymere in the semiconductor blend were made. The results were compared with purely organic composites.