Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster: Organic Semiconductors
CPP 8.31: Poster
Montag, 14. März 2011, 17:30–19:30, P2
Influence of the molecular structure of electron transport materials on the performance of organic solar cells — •Christiane Falkenberg, Markus Hummert, Selina Olthof, Christoph Schuenemann, Karl Leo, and Moritz Riede — Institut für Angewandte Photophysik, TU Dresden, 01069 Dresden
The synthesis of new functional molecules is an important approach for improving the performance of organic electronic devices. Here, understanding the link between the molecular structure and the physical properties of the materials plays a key role. We present a series of small molecules with a naphthalenetetracarboxylic diimide core and different side groups. All materials are designed to be applicable as transparent electron transport materials (ETM) in p-i-n type organic solar cells. In particular, we investigate the influence of the side chain length on basic physical properties like absorption, energy level position, morphology, and the enhancement of lateral conductivity of vacuum deposited thin films by molecular n-type doping. The latter shows the largest variations ranging from < 10−8 S/cm (hexyl) to 10−4 S/cm (no side chains). Finally, we compare the performance of the synthesized materials as ETM in organic solar cells. Depending on the side chain length power conversion efficiencies of 0.01% to 2.1% are reached.