Regensburg 2004 – wissenschaftliches Programm
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SYOH: Organic and Hybrid Systems for Future Electronics
SYOH 4: Hybrid Systems and Devices
SYOH 4.4: Vortrag
Donnerstag, 11. März 2004, 17:30–17:45, H37
Optical modeling of CuPc/C60 photovoltaic devices — •T. Stübinger1 and W. Brütting2 — 1Experimentalphysik II, Universität Bayreuth, D-95440 Bayreuth — 2Experimentalphysik IV, Universität Augsburg, D-86135 Augsburg
Photovoltaic devices with Cu-phthalocy anine (CuPc) as electron donor and Buckminsterfullerene (C60) as electron acceptor exhibit high incident photon-to-current conversion efficiencies (IPCE) in bilayer devices and composite systems. Optical interference effects significantly influence photocurrent spectra and quantum efficiencies, which arises from the strong dependence of layer thicknesses on the spatial distribution of the photon density. By optical modelling using transfer-matrix-methods the experimental photocurrent spectra of bilayer systems with various layer thicknesses (organic layers, buffer layers, electrodes) could be explained. Blend systems of CuPc and C60 show high quantum efficiencies of almost 60% (IPCE) due to an effectively enhanced dissociation volume in these composite systems. These high IPCE values demonstrate a very efficient photocarrier generation and charge transport in these low molecular weight composite systems, which is comparable to the most efficient polymer-fullerene composite systems after post-annealing treatments. The mixing ratio and total layer thickness of the blend system are varied to achieve optimum photovoltaic performance.