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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 4: Organic Photovoltaics: from Single Molecules to Devices

SYOP 4.8: Poster

Donnerstag, 26. März 2009, 16:30–19:00, P1A

Mixed films of phthalocyanines and perylene imids as bulk heterojunction materials — •André Dragässer¹, Robin Knecht¹, Christopher Keil¹, Günter Schnurpfeil², and Derck Schlettwein¹ — ¹Justus-Liebig-Universität Gießen, Institut für Angewandte Physik, Heinrich-Buff-Ring 16, D-35392, Gießen. eMail: schlettwein@uni-giessen.de — ²Institut für Organische und Makromolekulare Chemie, Universität Bremen, D-28334 Bremen.

The formation of evaporated blends of organic donor and acceptor molecules has gained interest recently for active interlayers in organic photovoltaic cells and organic field effect structures. In this contribution we report about the combination of phthalocyanines as electron donors absorbing in the red part of the spectrum and perylene imids as electron acceptors absorbing in the green part of the spectrum providing almost perfect coverage of the visible range. Mixed films were successfully created by simultaneous physical vapour deposition of the molecules to create an evaporated organic bulk heterojunction. The films were studied for their potential as materials in organic photovoltaic devices. Using transmission spectroscopy, structure analysis and photoconductivity measurements electronic and optical properties were investigated and compared with the properties of the pure films and solution spectra. The observed spectral dependence of the photoconductivity indicates a potential use of such materials in organic photovoltaic cells. First attempts to create a sandwich structure with indium tin oxide, the mixed organic layer and a metal contact will be discussed.