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dc.contributor.authorPranculis, Vytenis
dc.contributor.authorRuseckas, Arvydas
dc.contributor.authorVithanage, Dimali A.
dc.contributor.authorHedley, Gordon J
dc.contributor.authorSamuel, Ifor D. W.
dc.contributor.authorGulbinas, Vidmantas
dc.date.accessioned2016-07-27T15:30:08Z
dc.date.available2016-07-27T15:30:08Z
dc.date.issued2016-05-12
dc.identifier.citationPranculis , V , Ruseckas , A , Vithanage , D A , Hedley , G J , Samuel , I D W & Gulbinas , V 2016 , ' The influence of blend ratio and processing additive on free carrier yield and mobility in PTB7:PC 71 BM photovoltaic solar cells ' , Journal of Physical Chemistry C , vol. 120 , no. 18 , pp. 9588-9594 . https://doi.org/10.1021/acs.jpcc.6b01548en
dc.identifier.issn1932-7447
dc.identifier.otherPURE: 242259817
dc.identifier.otherPURE UUID: 32dab82a-d444-404e-8a0c-76f893719cec
dc.identifier.otherRIS: urn:5BB7E46CC55ED8C0E8CA118A2F8EEC0F
dc.identifier.otherScopus: 84971422333
dc.identifier.otherORCID: /0000-0001-9114-3522/work/32543057
dc.identifier.otherORCID: /0000-0001-6457-3236/work/60427388
dc.identifier.otherWOS: 000375969000006
dc.identifier.urihttps://hdl.handle.net/10023/9216
dc.descriptionThis work was supported by the Research Council of Lithuania (project MIP-85/2015), the Engineering and Physical Sciences Research Council of the UK (grants EP/J009016/1 and EP/L012294/1) and the European Research Council of the European Union (grant 321305). I.D.W.S. also acknowledges support from a Royal Society Wolfson Research Merit Award. D.A.V. is grateful to Supergen SuperSolar Hub for the travel grant.en
dc.description.abstractCharge separation and extraction dynamics were investigated in high performance bulk heterojunction solar cells made from the polymer PTB7 and the soluble fullerene PC71BM on a broad time scale from sub-picosecond to microseconds using ultrafast optical probing of carrier drift and the integral-mode photocurrent measurements. We show that the short circuit current is determined by the separation of charge pairs into free carriers which is strongly influenced by blend composition. This separation is found to be efficient in fullerene-rich blends where a high electron mobility of > 0.1 cm2V-1s-1 is observed in the first 10 ps after excitation. Morphology optimization using the solvent additive 1,8-di-iodooctane (DIO) doubles the charge pair separation efficiency and the short circuit current. Carrier extraction at low internal electric field is slightly faster from the cells prepared with DIO which can reduce recombination losses and enhance a fill factor.
dc.language.isoeng
dc.relation.ispartofJournal of Physical Chemistry Cen
dc.rightsCopyright 2016 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.en
dc.subjectQC Physicsen
dc.subjectDASen
dc.subjectSDG 7 - Affordable and Clean Energyen
dc.subject.lccQCen
dc.titleThe influence of blend ratio and processing additive on free carrier yield and mobility in PTB7:PC71BM photovoltaic solar cellsen
dc.typeJournal articleen
dc.contributor.sponsorEPSRCen
dc.contributor.sponsorEPSRCen
dc.contributor.sponsorEuropean Research Councilen
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.identifier.doihttps://doi.org/10.1021/acs.jpcc.6b01548
dc.description.statusPeer revieweden
dc.identifier.grantnumberN/Aen
dc.identifier.grantnumberEP/L012294/1en
dc.identifier.grantnumberen


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