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21 February 2002 Photocurrent spectra of bilayers and blends of the organic donor-acceptor system CuPc/C60
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Photocurrent spectra and quantum efficiency are investigated in photovoltaic cells with the electron donor material Cu-phthalocyanine (CuPc) together with C60 as electron acceptor material. By a systematic variation of both layer thicknesses in bilayer devices with the main process of photocurrent generation at the donor-acceptor interface we found a significant influence on photocurrent generation due to optical interference effects and determined the optimum layer thicknesses for both materials. The effective dissociation interface is increased by introducing a 1:1 blend of both materials between the pure CuPc and C60 layers. The more extended active volume of exciton dissociation leads to higher quantum efficiencies (IPCE up to approximately equals 22%) of the photovoltaic effect in comparison to the heterojunction bilayer devices.
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Thomas Stuebinger and Wolfgang Bruetting "Photocurrent spectra of bilayers and blends of the organic donor-acceptor system CuPc/C60", Proc. SPIE 4465, Organic Photovoltaics II, (21 February 2002);

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