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dc.contributor.authorSavikhin, Victoria
dc.contributor.authorJagadamma, Lethy K.
dc.contributor.authorPurvis, Lafe J.
dc.contributor.authorRobertson, Iain
dc.contributor.authorOosterhout, Stefan D.
dc.contributor.authorDouglas, Christopher J.
dc.contributor.authorSamuel, Ifor D. W.
dc.contributor.authorToney, Michael F.
dc.identifier.citationSavikhin , V , Jagadamma , L K , Purvis , L J , Robertson , I , Oosterhout , S D , Douglas , C J , Samuel , I D W & Toney , M F 2018 , ' Morphological, chemical, and electronic changes of the conjugated polymer PTB7 with thermal annealing ' , iScience , vol. 2 , pp. 182-192 .
dc.identifier.otherPURE: 252703061
dc.identifier.otherPURE UUID: d52b2b0d-77ed-4dac-a94b-ea6c6facc511
dc.identifier.otherRIS: urn:8F938979489899D369C6303CF40BB2CE
dc.identifier.otherScopus: 85053795613
dc.identifier.otherORCID: /0000-0002-4339-2484/work/60196629
dc.identifier.otherWOS: 000449721500018
dc.descriptionThis work was supported by the Office of Naval Research NDSEG fellowship (V.S.) and the Department of Energy SCGSR Program (L.J.P.). Work was partially supported by the Department of the Navy, Office of Naval Research Award No. N00014-14-1-0580 (S.D.O., M.F.T.). L.K.J., I.R., and I.D.W.S. were supported by the Engineering and Physical Sciences Research Council (grants EP/L017008/1 and EP/L012294/1 ). I.D.W.S. also acknowledges support from a Royal Society Wolfson Research Merit Award. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515.en
dc.description.abstractThere is considerable interest in improving the performance of organic optoelectronic devices through processing techniques. Here, we study the effect of high-temperature annealing on the properties of the semiconducting polymer PTB7 and PTB7:fullerene blends, of interest as efficient organic photovoltaic (OPV) devices. Annealing to moderate temperature improves the PTB7 morphology and optoelectronic properties. High-temperature annealing also improves morphology but results in poorer optoelectronic properties. This is a result of side chain cleavage that creates by-products that act as trap states, increasing electronic disorder and decreasing mobility. We further observe changes to the PTB7 chemical structure after thermal cleavage that are similar to those following solar irradiation. This implies that side chain cleavage is an important mechanism in device photodegradation, which is a major ?burn-in? loss mechanism in OPV. These results lend insight into side chain cleavage as a method of improving optoelectronic properties and suggest strategies for improvement in device photostability.
dc.rights© 2018 The Author(s). This is an open access article under the CC BY-NC-ND license (
dc.subjectQC Physicsen
dc.subjectQD Chemistryen
dc.subjectSDG 7 - Affordable and Clean Energyen
dc.titleMorphological, chemical, and electronic changes of the conjugated polymer PTB7 with thermal annealingen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.description.statusPeer revieweden

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