Print Email Facebook Twitter Exciton quenching close to polymer: Vacuum interface of spin-coated films of poly(p-phenylenevinylene) derivative Title Exciton quenching close to polymer: Vacuum interface of spin-coated films of poly(p-phenylenevinylene) derivative Author Mikhnenko, O.V. Cordella, F. Sieval, A.B. Hummelen, J.C. Blom, P.W.M. Loi, M.A. TNO Industrie en Techniek Publication year 2009 Abstract Polymer-fullerene bilayer heterostructures are suited to study excitonic processes in conjugated polymers. Excitons are efficiently quenched at the polymer-fullerene interface, whereas the polymer-vacuum interface is often considered as an exciton-reflecting interface. Here, we report about efficient exciton quenching close to the polymer-vacuum interface of spin-coated MDMO-PPV (poly[2-methoxy-5-(2′-ethyl-hexyloxy)-p-phenylenevinylene]) films. The quenching efficiency is estimated to be as high as that of the polymer-fullerene interface. This efficient quenching is consistent with enhanced intermolecular interactions close to the polymer-vacuum interface due to the formation of a "skin layer" during the spin-coating procedure. In the skin layer, the polymer density is higher; that is, the intermolecular distances are shorter than in the rest of the film. The effect of exciton quenching at the polymer-vacuum interface should be taken into account when the thickness of the polymer film is on the order of the exciton diffusion length; in particular, in the determination of the exciton diffusion length. © 2009 American Chemical Society. Subject ElectronicsIndustrial InnovationBi-layerExciton diffusion lengthExciton quenchingHeterostructuresIntermolecular distanceIntermolecular interactionsMDMO-PPVMethoxyPhenylenevinylenePoly(p-phenylene vinylene) derivativesPolymer densitiesPolymer-fullereneQuenching efficiencySkin layerSpin-coated filmsVacuum interfacesConjugated polymersExcitonsFullerenesOrganic light emitting diodes (OLED)Plastic filmsPolymer filmsQuenchingSpin dynamicsSpontaneous emissionPlastic coatings To reference this document use: http://resolver.tudelft.nl/uuid:e7bb3e1c-94d6-4871-97ed-b61f1016dbed TNO identifier 461657 ISSN 1520-6106 Source Journal of Physical Chemistry B, 113 (27), 9104-9109 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.