Dresden 2003 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 20: POSTER A
CPP 20.74: Poster
Montag, 24. März 2003, 19:00–21:00, ZEU/250
Optical modelling of CuPc/C60 donor-acceptor photovoltaic devices — •T. Stübinger1 and W. Brütting2 — 1Experimentalphysik II, Universität Bayreuth, D-95440 Bayreuth — 2Experimentalphysik IV, Universität Augsburg, D-86135 Augsburg
The photon-to-current conversion efficiency of photovoltaic devices with Cu-phthalocyanine (CuPc) as electron donor and Buckminsterfullerene (C60) as electron acceptor shows a strong dependence on the thickness of the organic layers. This effect is investigated both experimentally and by optical modelling using transfer-matrix-methods. Therefore the optical constants of all contributing layers have been determined by ellipsometry together with reflection and transmission measurements. It is found that not only the organic layers but also the electrodes and the substrate have an influence on the photovoltaic properties. Taking all these factors into account, good agreement between simulated and experimental photocurrent spectra is obtained. As compared to bilayer devices, blend systems of CuPc and C60 show higher quantum efficiencies due to the effectively enhanced dissociation volume. In such blend systems the influence of the mixing ratio and the total layer thickness on electrical transport is investigated.