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Jonathan A. Bartelt, Zach M. Beiley, Eric T. Hoke, William R. Mateker, Jessica D. Douglas, Brian A. Collins, John R. Tumbleston, Kenneth R. Graham, Aram Amassian, Harald Ade, Jean M. J. Fréchet, Michael F. Toney and Michael D. McGehee The Importance of Fullerene Percolation in the Mixed Regions of Polymer–Fullerene Bulk Heterojunction Solar Cells Advanced Energy Materials 3

Version of Record online: 26 OCT 2012 | DOI: 10.1002/aenm.201200637

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The active layer thickness of PBDTTPD:PCBM BHJ solar cells with 7.3% efficiency is limited by bimolecular recombination. Thermal annealing decreases device efficiency because it drives PCBM to diffuse out of the mixed regions of PBDTTPD:PCBM BHJs and decreases the concentration of PCBM mixed in the amorphous portions of PBDTTPD below the percolation threshold needed for efficient electron transport.

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