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dc.contributor.authorVezie, Michelle S.
dc.contributor.authorFew, Sheridan
dc.contributor.authorMeager, Iain
dc.contributor.authorPieridou, Galatia
dc.contributor.authorDörling, Bernhard
dc.contributor.authorAshraf, Raja Shahid
dc.contributor.authorGoñi, Alejandro R.
dc.contributor.authorBronstein, Hugo
dc.contributor.authorMcCulloch, Iain
dc.contributor.authorHayes, Sophia C.
dc.contributor.authorCampoy-Quiles, Mariano
dc.contributor.authorNelson, Jenny
dc.date.accessioned2017-01-02T09:28:29Z
dc.date.available2017-01-02T09:28:29Z
dc.date.issued2016-05-16
dc.identifier.citationVezie MS, Few S, Meager I, Pieridou G, Dörling B, et al. (2016) Exploring the origin of high optical absorption in conjugated polymers. Nature Materials 15: 746–753. Available: http://dx.doi.org/10.1038/nmat4645.
dc.identifier.issn1476-1122
dc.identifier.issn1476-4660
dc.identifier.pmid27183327
dc.identifier.doi10.1038/nmat4645
dc.identifier.urihttp://hdl.handle.net/10754/622402
dc.description.abstractThe specific optical absorption of an organic semiconductor is critical to the performance of organic optoelectronic devices. For example, higher light-harvesting efficiency can lead to higher photocurrent in solar cells that are limited by sub-optimal electrical transport. Here, we compare over 40 conjugated polymers, and find that many different chemical structures share an apparent maximum in their extinction coefficients. However, a diketopyrrolopyrrole-thienothiophene copolymer shows remarkably high optical absorption at relatively low photon energies. By investigating its backbone structure and conformation with measurements and quantum chemical calculations, we find that the high optical absorption can be explained by the high persistence length of the polymer. Accordingly, we demonstrate high absorption in other polymers with high theoretical persistence length. Visible light harvesting may be enhanced in other conjugated polymers through judicious design of the structure.
dc.description.sponsorshipM.S.V. and S.F. are grateful to the Engineering and Physical Sciences Research Council (EPSRC) for a doctoral training award and a CDT studentship (EP/G037515/1), respectively. G.P. and S.C.H. acknowledge the University of Cyprus for funding through the internal grant 'ORGANIC'. B.D., A.R.G. and M.C.-Q. acknowledge financial support from the Ministerio de Economia y Competitividad of Spain through projects CSD2010-00044 (Consolider NANOTHERM), SEV-2015-0496 and MAT2012-37776 and the European Research Council through project ERC CoG648901. I.Meager., R.S.A. and I.McCulloch acknowledge support from the European Commission FP7 Project ArtESun (604397). J.N. is grateful to the Royal Society for a Wolfson Merit Award, and acknowledges financial support from EPSRC grants EP/K030671/1, EP/K029843/1 and EP/J017361/1. The authors thank I. Alonso for performing supplementary ellipsometric measurements; we thank T. Kirchartz, J. Moore Frost, C. Muller, I. Alonso and A. Myers for helpful discussions.
dc.publisherSpringer Nature
dc.titleExploring the origin of high optical absorption in conjugated polymers
dc.typeArticle
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalNature Materials
dc.contributor.institutionCentre for Plastic Electronics, Department of Physics, Imperial College London, Prince Consort Road, London, SW7 2AZ, United Kingdom
dc.contributor.institutionCentre for Plastic Electronics, Department of Chemistry, Imperial College London, Exhibition Road, London, SW7 2AZ, United Kingdom
dc.contributor.institutionDepartment of Chemistry, University of Cyprus, PO Box 20537, Nicosia, 1678, Cyprus
dc.contributor.institutionInstitute of Material Science of Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, 08193, Spain
dc.contributor.institutionICREA, Passeig Lluís Companys 23, Barcelona, 08010, Spain
dc.contributor.institutionDepartment of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, United Kingdom
kaust.personMcCulloch, Iain
dc.date.published-online2016-05-16
dc.date.published-print2016-07


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