Show simple item record

dc.contributorVirginia Techen_US
dc.contributor.authorDrees, M.en_US
dc.contributor.authorDavis, R. M.en_US
dc.contributor.authorHeflin, James R.en_US
dc.date.accessioned2014-02-11T13:46:04Z
dc.date.available2014-02-11T13:46:04Z
dc.date.issued2004-04-28
dc.identifier.citationDrees, M ; Davis, RM ; Heflin, JR, Apr 2004. "Thickness dependence, in situ measurements, and morphology of thermally controlled interdiffusion in polymer-C-60 photovoltaic devices," PHYSICAL REVIEW B 69(16): 165320. DOI: 10.1103/PhysRevB.69.165320
dc.identifier.issn1098-0121
dc.identifier.urihttp://hdl.handle.net/10919/25423
dc.description.abstractA series of detailed studies is presented in which heat-induced interdiffusion is used to create a gradient bulk-heterojunction of 2-methoxy-5-(2(')-ethylhexyloxy)-1,4-phenylenevinylene (MEH-PPV) copolymer and C-60. Starting from a bilayer of spin-cast MEH-PPV and sublimed C-60, films are heated in the vicinity of the glass transition temperature of the polymer to induce an interdiffusion of polymer and fullerene. Variation of the polymer layer thickness shows that the photocurrents increase with decreasing layer thickness within the examined thickness regime as transport of the separated charges out of the film is improved. The interdiffusion was observed in situ by monitoring the photocurrents during the heating process and exhibited a rapid rise during the first five minutes. Cross-sectional transmission electron microscopy studies show that C-60 forms clusters of up to 30 nm in diameter in the polymer bulk of the interdiffused devices. This clustering of the fullerene molecules puts a significant constraint on the interdiffusion process that can be alleviated by use of donor-acceptor combinations with better miscibility.
dc.language.isoen_US
dc.publisherAmerican Physical Society
dc.subjectPhotoinduced electron-transferen_US
dc.subjectSolar cellsen_US
dc.subjectSemiconducting polymersen_US
dc.subjectConducting-polymeren_US
dc.subjectExciton diffusionen_US
dc.subjectAcceptoren_US
dc.subjectBlendsen_US
dc.subjectBuckminsterfullereneen_US
dc.subjectDissociationen_US
dc.subjectTemperatureen_US
dc.subjectPhysicsen_US
dc.titleThickness dependence, in situ measurements, and morphology of thermally controlled interdiffusion in polymer-C-60 photovoltaic devicesen_US
dc.typeArticle - Refereeden_US
dc.identifier.urlhttp://link.aps.org/doi/10.1103/PhysRevB.69.165320
dc.date.accessed2013-12-18
dc.title.serialPhysical Review B
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.69.165320
dc.type.dcmitypeTexten_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record