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dc.contributor.authorHimmelberger, Scott
dc.contributor.authorDacuña, Javier
dc.contributor.authorRivnay, Jonathan
dc.contributor.authorJimison, Leslie H.
dc.contributor.authorMcCarthy-Ward, Thomas
dc.contributor.authorHeeney, Martin
dc.contributor.authorMcCulloch, Iain
dc.contributor.authorToney, Michael F.
dc.contributor.authorSalleo, Alberto
dc.date.accessioned2016-02-25T13:12:08Z
dc.date.available2016-02-25T13:12:08Z
dc.date.issued2012-11-23
dc.identifier.citationHimmelberger S, Dacuña J, Rivnay J, Jimison LH, McCarthy-Ward T, et al. (2012) Effects of Confinement on Microstructure and Charge Transport in High Performance Semicrystalline Polymer Semiconductors. Advanced Functional Materials 23: 2091–2098. Available: http://dx.doi.org/10.1002/adfm.201202408.
dc.identifier.issn1616-301X
dc.identifier.doi10.1002/adfm.201202408
dc.identifier.urihttp://hdl.handle.net/10754/598073
dc.description.abstractThe film thickness of one of the most crystalline and highest performing polymer semiconductors, poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b] thiophene) (PBTTT), is varied in order to determine the effects of interfaces and confinement on the microstructure and performance in organic field effect transistors (OFETs). Crystalline texture and overall film crystallinity are found to depend strongly on film thickness and thermal processing. The angular distribution of crystallites narrows upon both a decrease in film thickness and thermal annealing. These changes in the film microstructure are paired with thin-film transistor characterization and shown to be directly correlated with variations in charge carrier mobility. Charge transport is shown to be governed by film crystallinity in films below 20 nm and by crystalline orientation for thicker films. An optimal thickness is found for PBTTT at which the mobility is maximized in unannealed films and where mobility reaches a plateau at its highest value for annealed films. The effects of confinement on the morphology and charge transport properties of poly(2,5-bis(3-tetradecylthiophen-2-yl) thieno[3,2-b]thiophene) (PBTTT) are studied using quantitative X-ray diffraction and field-effect transistor measurements. Polymer crystallinity is found to limit charge transport in the thinnest films while crystalline texture and intergrain connectivity modulate carrier mobility in thicker films. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
dc.description.sponsorshipPortions of this research were carried out at the Stanford Synchrotron Radiation Lightsource, a national user facility operated by Stanford University on behalf of the US Department of Energy, Office of Basic Energy Sciences. A.S. and S.H. gratefully acknowledge financial support from the National Science Foundation. This publication was partially based on work supported by the Center for Advanced Molecular Photovoltaics (Award No. KUS-C1-015-21), made by King Abdullah University of Science and Technology (KAUST).
dc.publisherWiley
dc.subjectcharge transport
dc.subjectcrystallinity
dc.subjectorganic electronics
dc.subjectorganic field-effect transistors
dc.subjectthin films
dc.titleEffects of Confinement on Microstructure and Charge Transport in High Performance Semicrystalline Polymer Semiconductors
dc.typeArticle
dc.identifier.journalAdvanced Functional Materials
dc.contributor.institutionMaterials Science and Engineering, Stanford, United States
dc.contributor.institutionImperial College London, London, United Kingdom
dc.contributor.institutionStanford Synchrotron Radiation Laboratory, Menlo Park, United States
kaust.grant.numberKUS-C1-015-21
kaust.grant.fundedcenterCenter for Advanced Molecular Photovoltaics (CAMP)
dc.date.published-online2012-11-23
dc.date.published-print2013-04-25


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