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Koen Vandewal, Abay Gadisa, Wibren D. Oosterbaan, Sabine Bertho, Fateme Banishoeib, Ineke Van Severen, Laurence Lutsen, Thomas J. Cleij, Dirk Vanderzande and Jean V. Manca The Relation Between Open-Circuit Voltage and the Onset of Photocurrent Generation by Charge-Transfer Absorption in Polymer : Fullerene Bulk Heterojunction Solar Cells Advanced Functional Materials 18

Article first published online: 9 JUL 2008 | DOI: 10.1002/adfm.200800056

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Photocurrent generation by charge-transfer absorption was detected by a highly sensitive measurement of the external quantum efficiency spectra of a range of polymer:fullerene photovoltaic devices, obtained by different preparation and annealing conditions. It was shown that the effective band gap of the blend, as obtained from the onset of the charge-transfer band, correlates with the open-circuit voltage of these devices.

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