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dc.contributorVirginia Tech. Physics Departmenten_US
dc.contributorVirginia Tech. Department of Chemical Engineeringen_US
dc.contributor.authorDrees, Martinen_US
dc.contributor.authorDavis, Richey M.en_US
dc.contributor.authorHeflin, James R.en_US
dc.date.accessioned2015-05-21T15:46:26Z
dc.date.available2015-05-21T15:46:26Z
dc.date.issued2005-02-01en_US
dc.identifier.citationDrees, M., Davis, R. M., Heflin, J. R. (2005). Improved morphology of polymer-fullerene photovoltaic devices with thermally induced concentration gradients. Journal of Applied Physics, 97(3). doi: 10.1063/1.1845574en_US
dc.identifier.issn0021-8979en_US
dc.identifier.urihttp://hdl.handle.net/10919/52390
dc.description.abstractGradient concentration profiles for efficient charge transfer and transport can be created in polymer-fullerene organic photovoltaics by thermally induced interdiffusion of an initial bilayer. Prior demonstrations with poly[2-methoxy-5-(2(')-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) and C-60 have been limited by the low miscibility of the two component materials. The morphology of the interdiffused films and resultant photovoltaic efficiency are improved by the use of the more miscible electron donor/electron acceptor pair of poly(3-octylthiophene) and C-60. The resultant concentration gradient profile is demonstrated by Auger spectroscopy and ion-beam milling. Increases in the short-circuit currents and fill factors relative to interdiffused MEH-PPV/C-60 devices lead to monochromatic power conversion efficiencies of 1.5% at 470 nm. (C) 2005 American Institute of Physics.en_US
dc.format.extent4 pagesen_US
dc.format.mimetypeapplication/pdfen_US
dc.language.isoen_USen_US
dc.publisherAmerican Institute of Physicsen_US
dc.subjectPolymersen_US
dc.subjectChemical interdiffusionen_US
dc.subjectActive layeren_US
dc.subjectSolar cellsen_US
dc.subjectAuger electron spectroscopyen_US
dc.titleImproved morphology of polymer-fullerene photovoltaic devices with thermally induced concentration gradientsen_US
dc.typeArticleen_US
dc.identifier.urlhttp://scitation.aip.org/content/aip/journal/jap/97/3/10.1063/1.1845574en_US
dc.date.accessed2015-04-24en_US
dc.title.serialJournal of Applied Physicsen_US
dc.identifier.doihttps://doi.org/10.1063/1.1845574
dc.type.dcmitypeTexten_US


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