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dc.contributor.authorGehrig, Dominik W.
dc.contributor.authorHoward, Ian A.
dc.contributor.authorSweetnam, Sean
dc.contributor.authorBurke, Timothy M.
dc.contributor.authorMcGehee, Michael D.
dc.contributor.authorLaquai, Frédéric
dc.date.accessioned2015-05-17T20:38:33Z
dc.date.available2015-05-17T20:38:33Z
dc.date.issued2015-04-07
dc.identifier.citationThe Impact of Donor-Acceptor Phase Separation on the Charge Carrier Dynamics in pBTTT:PCBM Photovoltaic Blends 2015:n/a Macromolecular Rapid Communications
dc.identifier.issn10221336
dc.identifier.doi10.1002/marc.201500112
dc.identifier.urihttp://hdl.handle.net/10754/553017
dc.description.abstractThe effect of donor–acceptor phase separation, controlled by the donor–acceptor mixing ratio, on the charge generation and recombination dynamics in pBTTT-C14:PC70BM bulk heterojunction photovoltaic blends is presented. Transient absorption (TA) spectroscopy spanning the dynamic range from pico- to microseconds in the visible and near-infrared spectral regions reveals that in a 1:1 blend exciton dissociation is ultrafast; however, charges cannot entirely escape their mutual Coulomb attraction and thus predominantly recombine geminately on a sub-ns timescale. In contrast, a polymer:fullerene mixing ratio of 1:4 facilitates the formation of spatially separated, that is free, charges and reduces substantially the fraction of geminate charge recombination, in turn leading to much more efficient photovoltaic devices. This illustrates that spatially extended donor or acceptor domains are required for the separation of charges on an ultrafast timescale (<100 fs), indicating that they are not only important for efficient charge transport and extraction, but also critically influence the initial stages of free charge carrier formation.
dc.publisherWiley
dc.relation.urlhttp://doi.wiley.com/10.1002/marc.201500112
dc.rightsThis is the peer reviewed version of the following article: Gehrig, D. W., Howard, I. A., Sweetnam, S., Burke, T. M., McGehee, M. D. and Laquai, F. (2015), The Impact of Donor–Acceptor Phase Separation on the Charge Carrier Dynamics in pBTTT:PCBM Photovoltaic Blends. Macromol. Rapid Commun.. doi: 10.1002/marc.201500112, which has been published in final form at http://doi.wiley.com/10.1002/marc.201500112. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
dc.subjectcarrier dynamics
dc.subjectpBTTT
dc.subjectphase separation
dc.subjectpolymer solar cells
dc.subjecttransient absorption spectroscopy
dc.titleThe Impact of Donor-Acceptor Phase Separation on the Charge Carrier Dynamics in pBTTT:PCBM Photovoltaic Blends
dc.typeArticle
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalMacromolecular Rapid Communications
dc.eprint.versionPost-print
dc.contributor.institutionMax Planck Research Group for Organic Optoelectronics; Max Planck Institute for Polymer Research; Ackermannweg 10 D-55128 Mainz Germany
dc.contributor.institutionInstitute of Microstructure Technology (IMT); Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 D-76344 Eggenstein-Leopoldshafen Germany
dc.contributor.institutionMaterials Science and Engineering; Stanford University; 476 Lomita Mall Stanford CA 94305-4045 USA
dc.contributor.institutionMaterials Science and Engineering; Stanford University; 476 Lomita Mall Stanford CA 94305-4045 USA
dc.contributor.institutionMaterials Science and Engineering; Stanford University; 476 Lomita Mall Stanford CA 94305-4045 USA
dc.contributor.institutionMax Planck Research Group for Organic Optoelectronics; Max Planck Institute for Polymer Research; Ackermannweg 10 D-55128 Mainz Germany
kaust.personLaquai, Frederic
refterms.dateFOA2016-04-07T00:00:00Z
dc.date.published-online2015-04-07
dc.date.published-print2015-06


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