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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 1: Nanoparticles and Composite Materials I

CPP 1.13: Vortrag

Montag, 11. März 2013, 13:15–13:30, H34

Charge transfer and recombination in hybrid solar cells with CuInS2 nanocrystals studied by light-induced electron spin resonance — •Christopher Krause, Rany Miranti, Dorothea Scheunemann, Florian Witt, Joanna Kolny-Olesiak, Holger Borchert, and Jürgen Parisi — University of Oldenburg, Department of Physics, Energy and Semiconductor Research Laboratory, 26129 Oldenburg

Organic-inorganic hybrid solar cells made of semiconductor nanocrystals embedded into an organic material have made considerable progress in recent years. The highest efficiencies of such kind of solar cell are currently reached with cadmium based semiconductor nanoparticles, which have the drawback of a high toxicity. Therefore we investigate the application of CuInS2 nanoparticles as a promising new candidate for organic-inorganic hybrid solar cells. By ligand exchange procedures we are able to modify the surface of the nanoparticles in order to enable an efficient charge transfer and control the number of trap states arising from dangling bonds. In this contribution, light-induced electron spin resonance (LESR) measurements on composites of CuInS2 nanoparticles with P3HT and PCBM will be presented. LESR is used to study the charge transfer at the hybrid donor/acceptor interface and its dependence on the ligand shell. Besides proving a successful photo-induced charge transfer we can use this method to investigate the density of trap states by analyzing the recombination kinetics of photo-generated long-lived charge carriers at different temperatures.