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12 May 2006 From evaporation to solution processed organic tandem solar cells
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In this study, we have investigated the possibility to realize different types of stacked, serially connected organic solar cells. First of all, we combined solution processed MDMO-PPV:PCBM or P3HT:PCBM and evaporated ZnPc-C60 bulk-heterojunction solar cells to achieved tandem cells exploiting the complementary absorption spectra of each single cells. Such devices exhibit open circuit voltages of 1V with a short-circuit current of approximately 5mA/cm2 and a fill factor of 0.35 under simulated AM1.5 illumination. In the case of stacked, series connected cells with all active layers processed from solution, we observed a significant increase of the open circuit voltage in comparison with the single junction cells: Device fabricated from two bilayers comprising MDMO-PPV and PCBM as photoactive materials exhibit 1.28V open circuit voltage, 1.1mA/cm2 short circuit current and a fill factor of 0.45 under simulated AM1.5 illumination.
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H.-J. Prall, R. Koeppe, R. Autengruber, M. Egginger, G. Dennler, and N. S. Sariciftci "From evaporation to solution processed organic tandem solar cells", Proc. SPIE 6197, Photonics for Solar Energy Systems, 61970F (12 May 2006);

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