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Dirk Veldman, Stefan C. J. Meskers and René A. J. Janssen The Energy of Charge-Transfer States in Electron Donor–Acceptor Blends: Insight into the Energy Losses in Organic Solar Cells Advanced Functional Materials 19

Article first published online: 4 MAY 2009 | DOI: 10.1002/adfm.200900090

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CT states at the electron donor–acceptor interface are key intermediates in bulk-heterojunction organic solar cells. A new general method allows determining their energy and provides insight into energetic losses in these cells. CT states may form with only 0.1 eV loss from the singlet excited state, but a major loss of 0.5 eV occurs when going to open-circuit, limiting the ultimate power conversion efficiency.

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