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Thickness threshold of structural ordering in thin MEH-PPV films

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dc.title Thickness threshold of structural ordering in thin MEH-PPV films en
dc.contributor.author Urbánek, Pavel
dc.contributor.author Kuřitka, Ivo
dc.contributor.author Daniš, Stanislav
dc.contributor.author Toušková, Jana
dc.contributor.author Toušek, Jiří
dc.relation.ispartof Polymer
dc.identifier.issn 0032-3861 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2014
utb.relation.volume 55
utb.relation.issue 16
dc.citation.spage 4050
dc.citation.epage 4056
dc.type article
dc.language.iso en
dc.publisher Elsevier
dc.identifier.doi 10.1016/j.polymer.2014.05.054
dc.relation.uri https://www.sciencedirect.com/science/article/pii/S003238611400442X
dc.subject Photoluminescence en
dc.subject Surface photovoltaic effect en
dc.subject Threshold en
dc.description.abstract The microstructure of thin poly-[2-methoxy-5-(2′-ethyl-hexyloxy)-p- phenylene vinylene] (MEH-PPV) films was investigated by photoluminescence measurements and X-Ray diffraction analysis over thickness from several tens up to several hundreds of nanometer. Obtained results were correlated with exciton diffusion length obtained by the photovoltage method. All measurements revealed that there is a threshold thickness for the microstructural order as well as for exciton diffusion length which are primary physical properties for function of any device made up from such films. Development of more ordered phase can be observed above the critical thickness of about 150 nm. Below the threshold, the polymer chains are preferentially in conformations promoting localized intrachain interactions. Above the threshold, two main features can be observed: (i) the conjugation length of polymer chain segments reaches its maximum and (ii) polymer stacking in more ordered and larger crystalline domains influences strongly the material properties, namely enhances the exciton diffusion length. © 2014 Elsevier Ltd. All rights reserved. en
utb.faculty University Institute
dc.identifier.uri http://hdl.handle.net/10563/1003837
utb.identifier.obdid 43872013
utb.identifier.scopus 2-s2.0-84905489289
utb.identifier.wok 000340812300087
utb.identifier.coden POLMA
utb.source j-scopus
dc.date.accessioned 2014-11-06T13:30:51Z
dc.date.available 2014-11-06T13:30:51Z
dc.description.sponsorship Operational Programme 'Education for Competitiveness'; European Social Fund (ESF); national budget of the Czech Republic [CZ.1.07/2.3.00/20.0104, CZ.1.05/2.1.00/03.0111]; Operational Programme 'Research and Development for Innovations'; European Regional Development Fund (ERDF)
utb.ou Centre of Polymer Systems
utb.contributor.internalauthor Urbánek, Pavel
utb.contributor.internalauthor Kuřitka, Ivo
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