Regensburg 2010 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 67: Organic Semiconductors: Solar Cells II (Joint Session with DS/CPP/O)
HL 67.5: Vortrag
Freitag, 26. März 2010, 11:30–11:45, H16
Evaporated Mixed Films of Electron Acceptor and Donor Molecules as Model Systems of Bulk Hetero Junction Materials — •André Dragässer, Max Beu, Christopher Keil, and Derck Schlettwein — Institute of Applied Physics, Justus-Liebig-University Giessen, Germany. email:schlettwein@uni-giessen.de
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. For example photovoltaic efficiencies in the 4 % range could be reached recently by research groups in Dresden, Hong Kong or Michigan for mixed blends of C60 and PcCu. It is well known that each individual compound is sensitive in its electrical properties to environmental influence (e.g. H2O, O2, etc.) and so will be the interplay of the molecules in this complex material. In this contribution we therefore report about the combination of electron donor and acceptor molecules, e.g. C60 and PcCu, as evaporated bulk heterojunction in simple model systems. Photovoltaic cells consisting of these layers were built in high vacuum and characterized in-situ with IV-measurements in the dark and under illumination. The influence of oxygen, air and conditioning of the films in vacuum will be discussed.