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Johan C. Bijleveld, Munazza Shahid, Jan Gilot, Martijn M. Wienk and René A. J. Janssen Copolymers of Cyclopentadithiophene and Electron-Deficient Aromatic Units Designed for Photovoltaic Applications Advanced Functional Materials 19

Version of Record online: 3 SEP 2009 | DOI: 10.1002/adfm.200900412

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Optimization of the energy levels of alternating CPDT-X copolymers is achieved by varying the electron-deficient aromatic segment and results in materials that feature minimal energy losses in bulk-heterojunction solar cells. For PCPDT-BO:PCBM, the offset between the band gap and open-circuit voltage cell is only ∼0.7 eV. This low offset contributes to its high power conversion efficiency (2.5%).

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