Thickness dependence, in situ measurements, and morphology of thermally controlled interdiffusion in polymer-C-60 photovoltaic devices

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dc.contributorVirginia Techen
dc.contributor.authorDrees, M.en
dc.contributor.authorDavis, Ruth M.en
dc.contributor.authorHeflin, James R.en
dc.contributor.departmentChemical Engineeringen
dc.contributor.departmentPhysicsen
dc.date.accessed2013-12-18en
dc.date.accessioned2014-02-11T13:46:04Zen
dc.date.available2014-02-11T13:46:04Zen
dc.date.issued2004-04-28en
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.en
dc.format.mimetypeapplication/pdfen
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.69.165320en
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.69.165320en
dc.identifier.issn1098-0121en
dc.identifier.urihttp://hdl.handle.net/10919/25423en
dc.identifier.urlhttp://link.aps.org/doi/10.1103/PhysRevB.69.165320en
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectPhotoinduced electron-transferen
dc.subjectSolar cellsen
dc.subjectSemiconducting polymersen
dc.subjectConducting-polymeren
dc.subjectExciton diffusionen
dc.subjectAcceptoren
dc.subjectBlendsen
dc.subjectBuckminsterfullereneen
dc.subjectDissociationen
dc.subjectTemperatureen
dc.subjectPhysicsen
dc.titleThickness dependence, in situ measurements, and morphology of thermally controlled interdiffusion in polymer-C-60 photovoltaic devicesen
dc.title.serialPhysical Review Ben
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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