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HL: Fachverband Halbleiterphysik

HL 62: Poster II: Photovoltaics and Organic Semiconductors

HL 62.17: Poster

Donnerstag, 25. März 2010, 18:00–20:00, Poster D2

Study of poly(3-hexylthiophene) by cyclic voltammetry — •Sabrina Jüchter, Holger Borchert, Joanna Kolny-Olesiak, Elizabeth von Hauff, and Jürgen Parisi — University of Oldenburg, Department of Physics, Energy and Semiconductor Research Laboratory, 26111 Oldenburg

The working principle of organic solar cells involves charge transfer reactions at a donor/acceptor interface as one important elementary step of the energy conversion process. Both the absolute and relative positions of the HOMO and LUMO energy levels of the donor and acceptor material are of importance for successful charge transfer. Cyclic voltammetry is an electrochemical method suitable to study redox reactions. One can obtain information on the absolute values of HOMO and LUMO levels, the thermodynamics, the kinetics of electron transfer reactions and downstream chemical reactions. The possibility of the investigation of electron transfer reactions is especially important for photovoltaics. In the work to be presented here, a measurement place for cyclic voltammetry was set up, including the design of the measurement cell. First measurements were performed with different samples of the electron donor material poly(3-hexylthiophene) (P3HT), in order to investigate if the HOMO and LUMO levels can be influenced by the molecular weight or different impurities. The P3HT is processed from solution to thin films by spin-coating. Another part of the work is the measurement of HOMO and LUMO levels in inorganic semiconductor nanoparticles of CdSe that can be used as electron acceptor material in organic-based solar cells.