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dc.contributor.authorGorenflot, Julien*
dc.contributor.authorPaulke, Andreas*
dc.contributor.authorPiersimoni, Fortunato*
dc.contributor.authorWolf, Jannic Sebastian*
dc.contributor.authorKan, Zhipeng*
dc.contributor.authorCruciani, Federico*
dc.contributor.authorEl Labban, Abdulrahman*
dc.contributor.authorNeher, Dieter*
dc.contributor.authorBeaujuge, Pierre*
dc.contributor.authorLaquai, Frédéric*
dc.date.accessioned2017-10-11T12:04:10Z
dc.date.available2017-10-11T12:04:10Z
dc.date.issued2017-09-28en
dc.identifier.citationGorenflot J, Paulke A, Piersimoni F, Wolf J, Kan Z, et al. (2017) From Recombination Dynamics to Device Performance: Quantifying the Efficiency of Exciton Dissociation, Charge Separation, and Extraction in Bulk Heterojunction Solar Cells with Fluorine-Substituted Polymer Donors. Advanced Energy Materials: 1701678. Available: http://dx.doi.org/10.1002/aenm.201701678.en
dc.identifier.issn1614-6832en
dc.identifier.doi10.1002/aenm.201701678en
dc.identifier.urihttp://hdl.handle.net/10754/625860
dc.description.abstractAn original set of experimental and modeling tools is used to quantify the yield of each of the physical processes leading to photocurrent generation in organic bulk heterojunction solar cells, enabling evaluation of materials and processing condition beyond the trivial comparison of device performances. Transient absorption spectroscopy, “the” technique to monitor all intermediate states over the entire relevant timescale, is combined with time-delayed collection field experiments, transfer matrix simulations, spectral deconvolution, and parametrization of the charge carrier recombination by a two-pool model, allowing quantification of densities of excitons and charges and extrapolation of their kinetics to device-relevant conditions. Photon absorption, charge transfer, charge separation, and charge extraction are all quantified for two recently developed wide-bandgap donor polymers: poly(4,8-bis((2-ethylhexyl)oxy)benzo[1,2-b:4,5-b′]dithiophene-3,4-difluorothiophene) (PBDT[2F]T) and its nonfluorinated counterpart poly(4,8-bis((2-ethylhexyl)oxy)benzo[1,2-b:4,5-b′]dithiophene-3,4-thiophene) (PBDT[2H]T) combined with PC71BM in bulk heterojunctions. The product of these yields is shown to agree well with the devices' external quantum efficiency. This methodology elucidates in the specific case studied here the origin of improved photocurrents obtained when using PBDT[2F]T instead of PBDT[2H]T as well as upon using solvent additives. Furthermore, a higher charge transfer (CT)-state energy is shown to lead to significantly lower energy losses (resulting in higher VOC) during charge generation compared to P3HT:PCBM.en
dc.description.sponsorshipThe research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST). A.P. and D.N. acknowledge funding from the BMBF in the project UNVEIL.en
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://onlinelibrary.wiley.com/doi/10.1002/aenm.201701678/fullen
dc.rightsThis is the peer reviewed version of the following article: From Recombination Dynamics to Device Performance: Quantifying the Efficiency of Exciton Dissociation, Charge Separation, and Extraction in Bulk Heterojunction Solar Cells with Fluorine-Substituted Polymer Donors, which has been published in final form at http://doi.org/10.1002/aenm.201701678. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.en
dc.titleFrom Recombination Dynamics to Device Performance: Quantifying the Efficiency of Exciton Dissociation, Charge Separation, and Extraction in Bulk Heterojunction Solar Cells with Fluorine-Substituted Polymer Donorsen
dc.typeArticleen
dc.contributor.departmentKAUST Solar Center (KSC)*
dc.contributor.departmentMaterials Science and Engineering Program*
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division*
dc.contributor.departmentChemical Science Program*
dc.identifier.journalAdvanced Energy Materialsen
dc.eprint.versionPost-printen
dc.contributor.institutionInstitute of Physics and Astronomy, Soft Matter Physics; University of Potsdam; Karl-Liebknecht-Straße 24−25 14476 Potsdam-Golm Germany*
kaust.authorGorenflot, Julien*
kaust.authorWolf, Jannic Sebastian*
kaust.authorKan, Zhipeng*
kaust.authorCruciani, Federico*
kaust.authorEl Labban, Abdulrahman*
kaust.authorBeaujuge, Pierre*
kaust.authorLaquai, Frédéric*


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