The fate of electron–hole pairs in polymer:fullerene blends for organic photovoltaics

Handle URI:
http://hdl.handle.net/10754/622033
Title:
The fate of electron–hole pairs in polymer:fullerene blends for organic photovoltaics
Authors:
Causa', Martina; Jonghe-Risse, Jelissa De; Scarongella, Mariateresa; Brauer, Jan C.; Domingo, Ester; Moser, Jacques-E.; Stingelin, Natalie; Banerji, Natalie
Abstract:
There has been long-standing debate on how free charges are generated in donor: acceptor blends that are used in organic solar cells, and which are generally comprised of a complex phase morphology, where intermixed and neat phases of the donor and acceptor material co-exist. Here we resolve this question, basing our conclusions on Stark effect spectroscopy data obtained in the absence and presence of externally applied electric fields. Reconciling opposing views found in literature, we unambiguously demonstrate that the fate of photogenerated electron-hole pairs-whether they will dissociate to free charges or geminately recombine-is determined at ultrafast times, despite the fact that their actual spatial separation can be much slower. Our insights are important to further develop rational approaches towards material design and processing of organic solar cells, assisting to realize their purported promise as lead-free, third-generation energy technology that can reach efficiencies over 10%.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Causa’ M, De Jonghe-Risse J, Scarongella M, Brauer JC, Buchaca-Domingo E, et al. (2016) The fate of electron–hole pairs in polymer:fullerene blends for organic photovoltaics. Nature Communications 7: 12556. Available: http://dx.doi.org/10.1038/ncomms12556.
Publisher:
Springer Nature
Journal:
Nature Communications
Issue Date:
2-Sep-2016
DOI:
10.1038/ncomms12556
Type:
Article
ISSN:
2041-1723
Sponsors:
M.C., M.S., J.C.B. and N.B. thank the Swiss National Science Foundation (PP00P2_150536) and the University of Fribourg for funding. N.B., J.D.J.-R and J.-E.M are grateful to NCCR-MUST, a research instrument of the Swiss National Science Foundation, for support. N.S. is supported by a European Research Council (ERC) Starting Independent Researcher Fellowship under the grant agreement No. 279587. E.B.-D. is funded by a SABIC Post-Doctoral Fellowship at King Abdullah University of Science and Technology. We thank Prof. Martin Heeney (Imperial College, London, UK) for providing the pBTTT polymer, and we thank Prof. E. Vauthey and R. Letrun (Univ. of Geneva, Switzerland) for use of their fluorescence up-conversion set-up and help with the experiment. We thank Dr A. Devizis (Center for Physical Sciences and Technology, Vilnius) for having built the EDA set-up and for useful discussion.
Additional Links:
http://www.nature.com/articles/ncomms12556
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorCausa', Martinaen
dc.contributor.authorJonghe-Risse, Jelissa Deen
dc.contributor.authorScarongella, Mariateresaen
dc.contributor.authorBrauer, Jan C.en
dc.contributor.authorDomingo, Esteren
dc.contributor.authorMoser, Jacques-E.en
dc.contributor.authorStingelin, Natalieen
dc.contributor.authorBanerji, Natalieen
dc.date.accessioned2016-12-18T13:36:59Z-
dc.date.available2016-12-18T13:36:59Z-
dc.date.issued2016-09-02en
dc.identifier.citationCausa’ M, De Jonghe-Risse J, Scarongella M, Brauer JC, Buchaca-Domingo E, et al. (2016) The fate of electron–hole pairs in polymer:fullerene blends for organic photovoltaics. Nature Communications 7: 12556. Available: http://dx.doi.org/10.1038/ncomms12556.en
dc.identifier.issn2041-1723en
dc.identifier.doi10.1038/ncomms12556en
dc.identifier.urihttp://hdl.handle.net/10754/622033-
dc.description.abstractThere has been long-standing debate on how free charges are generated in donor: acceptor blends that are used in organic solar cells, and which are generally comprised of a complex phase morphology, where intermixed and neat phases of the donor and acceptor material co-exist. Here we resolve this question, basing our conclusions on Stark effect spectroscopy data obtained in the absence and presence of externally applied electric fields. Reconciling opposing views found in literature, we unambiguously demonstrate that the fate of photogenerated electron-hole pairs-whether they will dissociate to free charges or geminately recombine-is determined at ultrafast times, despite the fact that their actual spatial separation can be much slower. Our insights are important to further develop rational approaches towards material design and processing of organic solar cells, assisting to realize their purported promise as lead-free, third-generation energy technology that can reach efficiencies over 10%.en
dc.description.sponsorshipM.C., M.S., J.C.B. and N.B. thank the Swiss National Science Foundation (PP00P2_150536) and the University of Fribourg for funding. N.B., J.D.J.-R and J.-E.M are grateful to NCCR-MUST, a research instrument of the Swiss National Science Foundation, for support. N.S. is supported by a European Research Council (ERC) Starting Independent Researcher Fellowship under the grant agreement No. 279587. E.B.-D. is funded by a SABIC Post-Doctoral Fellowship at King Abdullah University of Science and Technology. We thank Prof. Martin Heeney (Imperial College, London, UK) for providing the pBTTT polymer, and we thank Prof. E. Vauthey and R. Letrun (Univ. of Geneva, Switzerland) for use of their fluorescence up-conversion set-up and help with the experiment. We thank Dr A. Devizis (Center for Physical Sciences and Technology, Vilnius) for having built the EDA set-up and for useful discussion.en
dc.publisherSpringer Natureen
dc.relation.urlhttp://www.nature.com/articles/ncomms12556en
dc.rightsThis work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.titleThe fate of electron–hole pairs in polymer:fullerene blends for organic photovoltaicsen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalNature Communicationsen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionDepartment of Chemistry, University of Fribourg, Chemin du Musée 9, Fribourg, Switzerlanden
dc.contributor.institutionPhotochemical Dynamics Group, Institute of Chemical Sciences AndEngineering and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 6, Lausanne, Switzerlanden
dc.contributor.institutionDepartment of Materials and Centre for Plastic Electronics, Imperial College London, Exhibition Road, London, United Kingdomen
kaust.authorDomingo, Esteren
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