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dc.contributor.authorDyer-Smith, Clare
dc.contributor.authorHoward, Ian A.
dc.contributor.authorCabanetos, Clement
dc.contributor.authorEl Labban, Abdulrahman
dc.contributor.authorBeaujuge, Pierre
dc.contributor.authorLaquai, Frédéric
dc.date.accessioned2015-05-17T20:34:34Z
dc.date.available2015-05-17T20:34:34Z
dc.date.issued2015-01-29
dc.identifier.citationDyer-Smith C., Howard I. A., Cabanetos C., El Labban A., Beaujuge P. M., Laquai F. (2015). Interplay Between Side Chain Pattern, Polymer Aggregation, and Charge Carrier Dynamics in PBDTTPD:PCBM Bulk-Heterojunction Solar Cells. Adv. Energy Mater., 5: . doi: 10.1002/aenm.201401778
dc.identifier.issn16146832
dc.identifier.doi10.1002/aenm.201401778
dc.identifier.urihttp://hdl.handle.net/10754/553014
dc.description.abstractPoly(benzo[1,2-b:4,5-b′]dithiophene–alt–thieno[3,4-c]pyrrole-4,6-dione) (PBDTTPD) polymer donors with linear side-chains yield bulk-heterojunction (BHJ) solar cell power conversion efficiencies (PCEs) of about 4% with phenyl-C71-butyric acid methyl ester (PC71BM) as the acceptor, while a PBDTTPD polymer with a combination of branched and linear substituents yields a doubling of the PCE to 8%. Using transient optical spectroscopy it is shown that while the exciton dissociation and ultrafast charge generation steps are not strongly affected by the side chain modifications, the polymer with branched side chains exhibits a decreased rate of nongeminate recombination and a lower fraction of sub-nanosecond geminate recombination. In turn the yield of long-lived charge carriers increases, resulting in a 33% increase in short circuit current (J sc). In parallel, the two polymers show distinct grazing incidence X-ray scattering spectra indicative of the presence of stacks with different orientation patterns in optimized thin-film BHJ devices. Independent of the packing pattern the spectroscopic data also reveals the existence of polymer aggregates in the pristine polymer films as well as in both blends which trap excitons and hinder their dissociation.
dc.publisherWiley
dc.relation.urlhttp://doi.wiley.com/10.1002/aenm.201401778
dc.rightsThis is the peer reviewed version of the following article: Dyer-Smith C., Howard I. A., Cabanetos C., El Labban A., Beaujuge P. M., Laquai F. (2015). Interplay Between Side Chain Pattern, Polymer Aggregation, and Charge Carrier Dynamics in PBDTTPD:PCBM Bulk-Heterojunction Solar Cells. Adv. Energy Mater., 5: . doi: 10.1002/aenm.201401778, which has been published in final form at http://doi.wiley.com/10.1002/aenm.201401778. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
dc.subjectbulk-heterojunction solar cells
dc.subjectcharge carrier dynamics
dc.subjectpolymer solar cells
dc.subjectstructure–property relationships
dc.subjecttransient absorption spectroscopy
dc.titleInterplay Between Side Chain Pattern, Polymer Aggregation, and Charge Carrier Dynamics in PBDTTPD:PCBM Bulk-Heterojunction Solar Cells
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalAdvanced Energy Materials
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.institutionMax Planck Research Group for Organic Optoelectronics; Max Planck Institute for Polymer Research; Ackermannweg 10 D-55128 Mainz Germany
dc.contributor.institutionMax Planck Research Group for Organic Optoelectronics; Max Planck Institute for Polymer Research; Ackermannweg 10 D-55128 Mainz Germany
kaust.personCabanetos, Clement
kaust.personEl Labban, Abdulrahman
kaust.personBeaujuge, Pierre
refterms.dateFOA2016-01-29T00:00:00Z
dc.date.published-online2015-01-29
dc.date.published-print2015-05


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