COLL 92 |
| This paper will consider the parameters determining the efficiency of charge photogeneration in polymer / small molecule blend films, and their impact upon the performance of organic solar cells. Transient absorption studies on the nanosecond – millisecond timescales will be employed to determine polaron yields and lifetimes; these observations will be correlated with molecular properties (structure, electron affinity, mobility, crystallinity etc) and with device photocurrent generation efficiency. Topics addressed will include the role of interfacial bound radical states, the LUMO level offset required for charge dissociation, monomolecular versus bimolecular recombination and the role of film annealing. These results will be discussed in the broader context of charge photogeneration at nanostructured interfaces, and in particular contrasted with data obtained for molecular donor / acceptor dyads and dye sensitized organic / inorganic heterojunctions. |
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Interfacial Electron Transfer and Solar Energy Conversion: From Molecules to Nanomaterials
8:20 AM-12:00 PM, Monday, April 7, 2008 Morial Convention Center -- Rm. 226, Oral
Division of Colloid & Surface Chemistry |