A Close Look at Charge Generation in Polymer:Fullerene Blends with Microstructure Control

Handle URI:
http://hdl.handle.net/10754/597232
Title:
A Close Look at Charge Generation in Polymer:Fullerene Blends with Microstructure Control
Authors:
Scarongella, Mariateresa; De Jonghe-Risse, Jelissa; Buchaca-Domingo, Ester; Causa’, Martina; Fei, Zhuping; Heeney, Martin; Moser, Jacques-E.; Stingelin, Natalie; Banerji, Natalie
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.
Citation:
Scarongella 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.
Publisher:
American Chemical Society (ACS)
Journal:
Journal of the American Chemical Society
Issue Date:
4-Mar-2015
DOI:
10.1021/ja510032x
PubMed ID:
25650696
Type:
Article
ISSN:
0002-7863; 1520-5126
Sponsors:
M.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
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Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorScarongella, Mariateresaen
dc.contributor.authorDe Jonghe-Risse, Jelissaen
dc.contributor.authorBuchaca-Domingo, Esteren
dc.contributor.authorCausa’, Martinaen
dc.contributor.authorFei, Zhupingen
dc.contributor.authorHeeney, Martinen
dc.contributor.authorMoser, Jacques-E.en
dc.contributor.authorStingelin, Natalieen
dc.contributor.authorBanerji, Natalieen
dc.date.accessioned2016-02-25T12:28:32Zen
dc.date.available2016-02-25T12:28:32Zen
dc.date.issued2015-03-04en
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.en
dc.identifier.issn0002-7863en
dc.identifier.issn1520-5126en
dc.identifier.pmid25650696en
dc.identifier.doi10.1021/ja510032xen
dc.identifier.urihttp://hdl.handle.net/10754/597232en
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.en
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 theen
dc.publisherAmerican Chemical Society (ACS)en
dc.titleA Close Look at Charge Generation in Polymer:Fullerene Blends with Microstructure Controlen
dc.typeArticleen
dc.identifier.journalJournal of the American Chemical Societyen
dc.contributor.institutionEcole Polytechnique Federale de Lausanne, Lausanne, Switzerlanden
dc.contributor.institutionImperial College London, London, United Kingdomen
dc.contributor.institutionUniversite de Fribourg, Fribourg, Switzerlanden

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