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dc.contributor.authorAlqahtani, Obaid
dc.contributor.authorBabics, Maxime
dc.contributor.authorGorenflot, Julien
dc.contributor.authorSavikhin, Victoria
dc.contributor.authorFerron, Thomas
dc.contributor.authorAlbalawi, Ahmed
dc.contributor.authorPaulke, Andreas
dc.contributor.authorKan, Zhipeng
dc.contributor.authorPope, Michael
dc.contributor.authorClulow, Andrew J.
dc.contributor.authorWolf, Jannic Sebastian
dc.contributor.authorBurn, Paul L.
dc.contributor.authorGentle, Ian R.
dc.contributor.authorNeher, Dieter
dc.contributor.authorToney, Michael F.
dc.contributor.authorLaquai, Frédéric
dc.contributor.authorBeaujuge, Pierre
dc.contributor.authorCollins, Brian A.
dc.date.accessioned2018-04-11T06:55:43Z
dc.date.available2018-04-11T06:55:43Z
dc.date.issued2018-03-24
dc.identifier.citationAlqahtani O, Babics M, Gorenflot J, Savikhin V, Ferron T, et al. (2018) Mixed Domains Enhance Charge Generation and Extraction in Bulk-Heterojunction Solar Cells with Small-Molecule Donors. Advanced Energy Materials: 1702941. Available: http://dx.doi.org/10.1002/aenm.201702941.
dc.identifier.issn1614-6832
dc.identifier.doi10.1002/aenm.201702941
dc.identifier.urihttp://hdl.handle.net/10754/627429
dc.description.abstractThe interplay between nanomorphology and efficiency of polymer-fullerene bulk-heterojunction (BHJ) solar cells has been the subject of intense research, but the generality of these concepts for small-molecule (SM) BHJs remains unclear. Here, the relation between performance; charge generation, recombination, and extraction dynamics; and nanomorphology achievable with two SM donors benzo[1,2-b:4,5-b]dithiophene-pyrido[3,4-b]-pyrazine BDT(PPTh), namely SM1 and SM2, differing by their side-chains, are examined as a function of solution additive composition. The results show that the additive 1,8-diiodooctane acts as a plasticizer in the blends, increases domain size, and promotes ordering/crystallinity. Surprisingly, the system with high domain purity (SM1) exhibits both poor exciton harvesting and severe charge trapping, alleviated only slightly with increased crystallinity. In contrast, the system consisting of mixed domains and lower crystallinity (SM2) shows both excellent exciton harvesting and low charge recombination losses. Importantly, the onset of large, pure crystallites in the latter (SM2) system reduces efficiency, pointing to possible differences in the ideal morphologies for SM-based BHJ solar cells compared with polymer-fullerene devices. In polymer-based systems, tie chains between pure polymer crystals establish a continuous charge transport network, whereas SM-based active layers may in some cases require mixed domains that enable both aggregation and charge percolation to the electrodes.
dc.description.sponsorshipO.A. was supported by Prince Sattam bin Abdulaziz University in Saudi Arabia and the Saudi Arabian Cultural Mission in the United States. T.F. was supported by the Washington State University Seed Grant Program. A.P. and D.N. acknowledge financial support from the German Ministry of Science and Education (project UNVEIL). V.S. acknowledges financial support from the NDSEG fellowship. This research used resources described above of the Advanced Light Source, which is a DOE Office of Science User Facility under Contract No. DE-AC02-05CH11231 and Stanford Synchrotron Radiation Lightsource. P.M.B. acknowledges support by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. CRG_R2_13_BEAU_KAUST_1 and under KAUST Baseline Research Funding. The authors also wish to acknowledge the Australian Centre for Neutron Scattering (formerly the Bragg Institute at the time of the measurements) and the Australian Nuclear Science and Technology Organisation (ANSTO) for providing the neutron research facilities for the NR experiments. The NR measurements were supported by an Australian Research Council Discovery Program (DP120101372). The authors would like to thank Dr. Andrew Nelson, Dr. Ravi Chandra Raju Nagiri, and Mr. Jake McEwan for their assistance in performing the NR measurements.
dc.publisherWiley
dc.relation.urlhttps://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.201702941
dc.rightsThis is the peer reviewed version of the following article: Mixed Domains Enhance Charge Generation and Extraction in Bulk-Heterojunction Solar Cells with Small-Molecule Donors, which has been published in final form at http://doi.org/10.1002/aenm.201702941. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
dc.subjectCharge transport
dc.subjectDomain purity
dc.subjectMicroscopy
dc.subjectMixed domains
dc.subjectOrganic solar cells
dc.subjectPhotovoltaic devices
dc.subjectResonant X-ray scattering
dc.subjectSmall molecules
dc.subjectTransient spectroscopy
dc.titleMixed Domains Enhance Charge Generation and Extraction in Bulk-Heterojunction Solar Cells with Small-Molecule Donors
dc.typeArticle
dc.contributor.departmentAli I. Al-Naimi Petroleum Engineering Research Center (ANPERC)
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.institutionDepartment of Physics and Astronomy; Washington State University; Pullman WA 99164 USA
dc.contributor.institutionStanford Synchrotron Radiation Lightsource; SLAC National Accelerator Laboratory; Menlo Park CA 94025 USA
dc.contributor.institutionElectrical Engineering Department; Stanford University; Stanford CA 94305 USA
dc.contributor.institutionInstitut fur Physik und Astronomie; Physik weicher Materie; University of Potsdam; Potsdam-Golm 14476 Germany
dc.contributor.institutionCentre for Organic Photonics & Electronics; The University of Queensland; Queensland 4072 Australia
kaust.personBabics, Maxime
kaust.personGorenflot, Julien
kaust.personAlbalawi, Ahmed
kaust.personKan, Zhipeng
kaust.personWolf, Jannic Sebastian
kaust.personLaquai, Frederic
kaust.personBeaujuge, Pierre
kaust.grant.numberCRG_R2_13_BEAU_KAUST_1
refterms.dateFOA2019-03-24T00:00:00Z
dc.date.published-online2018-03-24
dc.date.published-print2018-07


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