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Daniele Di Nuzzo, Gert-Jan A. H. Wetzelaer, Ricardo K. M. Bouwer, Veronique S. Gevaerts, Stefan C. J. Meskers, Jan C. Hummelen, Paul W. M. Blom and René A. J. Janssen Simultaneous Open-Circuit Voltage Enhancement and Short-Circuit Current Loss in Polymer: Fullerene Solar Cells Correlated by Reduced Quantum Efficiency for Photoinduced Electron Transfer Advanced Energy Materials 3

Article first published online: 3 AUG 2012 | DOI: 10.1002/aenm.201200426

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Photoinduced electron transfer in organic donor-acceptor blends consisting of PF10TBT and different fullerene derivatives only occurs efficiently when the free energy for charge transfer (ΔGET) is more negative than −0.1 eV. This criterion limits the chemical potential at open circuit of bulk heterojunction organic solar cells to about 0.6 eV below the optical bandgap for presently known blends of molecular materials.

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