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dc.creatorLiu, Huien_US
dc.creatorLiu, Jinjunen_US
dc.creatorShah, Hemant M.en_US
dc.creatorAlphenaar, Bruce W.en_US
dc.date.accessioned2012-07-09T19:44:46Z
dc.date.available2012-07-09T19:44:46Z
dc.date.issued2012en_US
dc.identifier2012-FE-01en_US
dc.identifier.urihttp://hdl.handle.net/1811/52556
dc.descriptionAuthor Institution: Department of Chemistry, University of Louisville, Louisville, KY 40292; Department of Electrical & Computer Engineering, University of Louisville, Louisville, KY 40292en_US
dc.description.abstractFullerene derivatives such as [6,6]-phenyl-C$_{61}$-butyric acid methyl ester (PC$_{60}$BM) and [6,6]-phenyl-C$_{71}$-butyric acid methyl ester (PC$_{70}$BM) are promising electron acceptors for use in efficient organic solar cells. Capacitive photocurrent spectra of both PC$_{60}$BM and PC$_{70}$BM in conjunction with indium tin oxide (ITO) reveal peaks with wavelengths longer than the S$_1 \leftarrow$S$_0$ transitions. The energies of low-lying triplet states of both molecules calculated using the ZINDO/S method agree with the experimentally observed transition frequencies. An excitation mechanism that involves collisions between the photoinduced free electrons in ITO and the organic molecules on the interface is proposed to explain the experimental observation. Tests on other organic solar cells are in process. Possibilities of improving the conversion efficiency of organic solar cells utilizing this mechanism will be discussed.en_US
dc.language.isoenen_US
dc.publisherOhio State Universityen_US
dc.titleOBSERVATION OF SINGLET-TRIPLET TRANSITIONS IN CAPACITIVE PHOTOCURRENT SPECTROSCOPY OF ORGANIC SOLAR CELLSen_US
dc.typeArticleen_US
dc.typeImageen_US
dc.typePresentationen_US


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