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Eric T. Hoke, Koen Vandewal, Jonathan A. Bartelt, William R. Mateker, Jessica D. Douglas, Rodrigo Noriega, Kenneth R. Graham, Jean M. J. Fréchet, Alberto Salleo and Michael D. McGehee Recombination in Polymer:Fullerene Solar Cells with Open-Circuit Voltages Approaching and Exceeding 1.0 V Advanced Energy Materials 3

Article first published online: 14 SEP 2012 | DOI: 10.1002/aenm.201200474

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A high open-circuit voltage of 0.945 V and an efficiency over 7% is demonstrated in PBDTTPD:PCBM bulk heterojunction devices, making them ideal for tandem devices. The voltage is raised above 1 V using multiadduct fullerenes, but the current is reduced and recombination of fullerene excitons is observed, suggesting that the voltage of polymer:fullerene devices may be limited by the fullerene bandgap.

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