Dresden 2006 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 23: POSTER Functional Organic Thin Films
CPP 23.51: Poster
Thursday, March 30, 2006, 17:00–19:00, P2
Optimization of organic thin-film photovoltaic cells based on the low gap oligothiophene derivative DCV3T — •Christian Uhrich1, Rico Schüppel1, Kerstin Schulze1, Karl Leo1, Martin Pfeiffer1, and Peter Bäuerle2 — 1Institut für Angewandte Photophysik, TU Dresden — 2Abteilung Organische Chemie II, Universität Ulm
We have recently reported about a new oligothiophene derivate featuring dicyanovinylene end groups that can be used as acceptor material in organic thin-film photovoltaic cells. The material DCV3T has a high absorption coefficient (alpha =2.5x10^5 1/cm^2 @540nm) absorbing light in a wide range. We prepared cells based on a flat heterojunction between DCV3T and 4P-TPD, a weekly donor-type amorphous material, embedded between ITO and a p-doped hole-transport layer. These cells reach an open-circuit-voltage of up to 1.04 V. Supported by optical simulations, we optimized the individual film thicknesses and improved the efficiency to 2.3 % at 100 mW/cm^2 simulated sunlight. The simulations also allow us to estimate the exciton-diffusion length in DCV3T. Moreover, we investigated the heterointerfaces comprised in the solar-cell structure by UPS and XPS measurements. These measurements give information about the HOMO-levels and possible interface dipoles.