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dc.contributor.authorScarongella, Mariateresa
dc.contributor.authorDe Jonghe-Risse, Jelissa
dc.contributor.authorBuchaca-Domingo, Ester
dc.contributor.authorCausa’, Martina
dc.contributor.authorFei, Zhuping
dc.contributor.authorHeeney, Martin
dc.contributor.authorMoser, Jacques-E.
dc.contributor.authorStingelin, Natalie
dc.contributor.authorBanerji, Natalie
dc.date.accessioned2016-02-25T12:28:32Z
dc.date.available2016-02-25T12:28:32Z
dc.date.issued2015-02-18
dc.identifier.citationScarongella M, De Jonghe-Risse J, Buchaca-Domingo E, Causa’ M, Fei Z, et al. (2015) A Close Look at Charge Generation in Polymer:Fullerene Blends with Microstructure Control. Journal of the American Chemical Society 137: 2908–2918. Available: http://dx.doi.org/10.1021/ja510032x.
dc.identifier.issn0002-7863
dc.identifier.issn1520-5126
dc.identifier.pmid25650696
dc.identifier.doi10.1021/ja510032x
dc.identifier.urihttp://hdl.handle.net/10754/597232
dc.description.abstract© 2015 American Chemical Society. We reveal some of the key mechanisms during charge generation in polymer:fullerene blends exploiting our well-defined understanding of the microstructures obtained in pBTTT:PCBM systems via processing with fatty acid methyl ester additives. Based on ultrafast transient absorption, electro-absorption, and fluorescence up-conversion spectroscopy, we find that exciton diffusion through relatively phase-pure polymer or fullerene domains limits the rate of electron and hole transfer, while prompt charge separation occurs in regions where the polymer and fullerene are molecularly intermixed (such as the co-crystal phase where fullerenes intercalate between polymer chains in pBTTT:PCBM). We moreover confirm the importance of neat domains, which are essential to prevent geminate recombination of bound electron-hole pairs. Most interestingly, using an electro-absorption (Stark effect) signature, we directly visualize the migration of holes from intermixed to neat regions, which occurs on the subpicosecond time scale. This ultrafast transport is likely sustained by high local mobility (possibly along chains extending from the co-crystal phase to neat regions) and by an energy cascade driving the holes toward the neat domains.
dc.description.sponsorshipM.S., M.C. and N.B. are funded by the Swiss National Science Foundation, through the Ambizione Fellowship (PZ00P2_136853) and the Stipend Professorship (PP00P2_150536). N.B. and M.C. are also supported by the
dc.publisherAmerican Chemical Society (ACS)
dc.titleA Close Look at Charge Generation in Polymer:Fullerene Blends with Microstructure Control
dc.typeArticle
dc.identifier.journalJournal of the American Chemical Society
dc.contributor.institutionEcole Polytechnique Federale de Lausanne, Lausanne, Switzerland
dc.contributor.institutionImperial College London, London, United Kingdom
dc.contributor.institutionUniversite de Fribourg, Fribourg, Switzerland
dc.date.published-online2015-02-18
dc.date.published-print2015-03-04


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