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Hole delocalization as a driving force for charge pair dissociation in organic photovoltaics
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dc.contributor.author | Matheson, Andrew B. | |
dc.contributor.author | Ruseckas, Arvydas | |
dc.contributor.author | Pearson, Scott J. | |
dc.contributor.author | Samuel, Ifor D. W. | |
dc.date.accessioned | 2019-02-27T12:30:07Z | |
dc.date.available | 2019-02-27T12:30:07Z | |
dc.date.issued | 2019-02-27 | |
dc.identifier.citation | Matheson , A B , Ruseckas , A , Pearson , S J & Samuel , I D W 2019 , ' Hole delocalization as a driving force for charge pair dissociation in organic photovoltaics ' , Materials Horizons , vol. Advance Article . https://doi.org/10.1039/C8MH01204K | en |
dc.identifier.issn | 2051-6347 | |
dc.identifier.other | PURE: 257948775 | |
dc.identifier.other | PURE UUID: b6adff55-1eb8-4e4c-83da-421d99241eab | |
dc.identifier.other | crossref: 10.1039/C8MH01204K | |
dc.identifier.other | ORCID: /0000-0001-9114-3522/work/54819052 | |
dc.identifier.other | Scopus: 85065995331 | |
dc.identifier.other | WOS: 000474145200014 | |
dc.identifier.uri | https://hdl.handle.net/10023/17163 | |
dc.description | This work was supported by the Engineering and Physical Sciences Research Council (grants EP/L017008/1, EP/G03673X/1 and EP/J009016/1) and the European Research Council (grant 321305). I. D. W. S. acknowledges a Royal Society Wolfson Research Merit Award. | en |
dc.description.abstract | Charge carrier photogeneration is studied in photovoltaic blends of the conjugated polymer PTB7 with the electron acceptor PC71BM at low excitation densities using broadband transient absorption spectroscopy. In the optimized blend we observe a rise of hole polaron absorption on a 500 ps time scale which implies an increase of hole delocalization when photo-generated charge pairs dissociate into free charges. This concept is supported by the observed saturation of polaron absorption with electrochemical oxidation of polymer films, and the significant differences in transient absorption spectra observed in an inefficient blend due to bound charge transfer (CT) states. Our results suggest that hole polaron delocalization on polymer chains and entropy provide driving force for charge separation by lowering the free energy of the spatially separated charge pair. A potential barrier to the reformation of CT states appears as a result of carrier delocalization which also helps to reduce non-geminate carrier recombination. | |
dc.format.extent | 7 | |
dc.language.iso | eng | |
dc.relation.ispartof | Materials Horizons | en |
dc.rights | Copyright 2019 the Author(s). This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. | en |
dc.subject | QC Physics | en |
dc.subject | TK Electrical engineering. Electronics Nuclear engineering | en |
dc.subject | DAS | en |
dc.subject | SDG 7 - Affordable and Clean Energy | en |
dc.subject.lcc | QC | en |
dc.subject.lcc | TK | en |
dc.title | Hole delocalization as a driving force for charge pair dissociation in organic photovoltaics | en |
dc.type | Journal article | en |
dc.contributor.sponsor | EPSRC | en |
dc.contributor.sponsor | EPSRC | en |
dc.contributor.sponsor | The Royal Society | en |
dc.description.version | Publisher PDF | en |
dc.contributor.institution | University of St Andrews. Organic Semiconductor Centre | en |
dc.contributor.institution | University of St Andrews. School of Physics and Astronomy | en |
dc.contributor.institution | University of St Andrews. Condensed Matter Physics | en |
dc.contributor.institution | University of St Andrews. Centre for Biophotonics | en |
dc.identifier.doi | https://doi.org/10.1039/C8MH01204K | |
dc.description.status | Peer reviewed | en |
dc.identifier.grantnumber | ep/l017008/1 | en |
dc.identifier.grantnumber | N/A | en |
dc.identifier.grantnumber | en |
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