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dc.contributor.authorCha, Hyojung
dc.contributor.authorWu, Jiaying
dc.contributor.authorWadsworth, Andrew
dc.contributor.authorNagitta, Jade
dc.contributor.authorLimbu, Saurav
dc.contributor.authorPont, Sebastian
dc.contributor.authorLi, Zhe
dc.contributor.authorSearle, Justin
dc.contributor.authorWyatt, Mark F.
dc.contributor.authorBaran, Derya
dc.contributor.authorKim, Ji-Seon
dc.contributor.authorMcCulloch, Iain
dc.contributor.authorDurrant, James R.
dc.date.accessioned2017-10-03T12:49:31Z
dc.date.available2017-10-03T12:49:31Z
dc.date.issued2017-06-28
dc.identifier.citationCha H, Wu J, Wadsworth A, Nagitta J, Limbu S, et al. (2017) An Efficient, “Burn in” Free Organic Solar Cell Employing a Nonfullerene Electron Acceptor. Advanced Materials 29: 1701156. Available: http://dx.doi.org/10.1002/adma.201701156.
dc.identifier.issn0935-9648
dc.identifier.pmid28657152
dc.identifier.doi10.1002/adma.201701156
dc.identifier.urihttp://hdl.handle.net/10754/625643
dc.description.abstractA comparison of the efficiency, stability, and photophysics of organic solar cells employing poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3'″-di(2-octyldodecyl)-2,2';5',2″;5″,2'″-quaterthiophen-5,5'″-diyl)] (PffBT4T-2OD) as a donor polymer blended with either the nonfullerene acceptor EH-IDTBR or the fullerene derivative, [6,6]-phenyl C71 butyric acid methyl ester (PC71 BM) as electron acceptors is reported. Inverted PffBT4T-2OD:EH-IDTBR blend solar cell fabricated without any processing additive achieves power conversion efficiencies (PCEs) of 9.5 ± 0.2%. The devices exhibit a high open circuit voltage of 1.08 ± 0.01 V, attributed to the high lowest unoccupied molecular orbital (LUMO) level of EH-IDTBR. Photoluminescence quenching and transient absorption data are employed to elucidate the ultrafast kinetics and efficiencies of charge separation in both blends, with PffBT4T-2OD exciton diffusion kinetics within polymer domains, and geminate recombination losses following exciton separation being identified as key factors determining the efficiency of photocurrent generation. Remarkably, while encapsulated PffBT4T-2OD:PC71 BM solar cells show significant efficiency loss under simulated solar irradiation (“burn in” degradation) due to the trap-assisted recombination through increased photoinduced trap states, PffBT4T-2OD:EH-IDTBR solar cell shows negligible burn in efficiency loss. Furthermore, PffBT4T-2OD:EH-IDTBR solar cells are found to be substantially more stable under 85 °C thermal stress than PffBT4T-2OD:PC71BM devices.
dc.description.sponsorshipThe authors gratefully acknowledge funding supported by KAUST under the Grant Agreement number OSR-2015-CRG4-2572, the EU FP7 project CHEETAH, the EPSRC through the Centre for Doctoral Training in Plastic Electronics (EP/L0160702/1) and thank Pabitra Shakya for assistance in device fabrication.
dc.publisherWiley
dc.relation.urlhttp://onlinelibrary.wiley.com/doi/10.1002/adma.201701156/full
dc.rightsThis is the peer reviewed version of the following article: An Efficient, "Burn in" Free Organic Solar Cell Employing a Nonfullerene Electron Acceptor, which has been published in final form at http://doi.org/10.1002/adma.201701156. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
dc.subjectCharge Separation
dc.subjectOrganic Solar Cells
dc.subjectNonfullerene Acceptors
dc.subjectTrap Assisted Recombination
dc.titleAn Efficient, “Burn in” Free Organic Solar Cell Employing a Nonfullerene Electron Acceptor
dc.typeArticle
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 Materials
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Chemistry and Centre for Plastic Electronics; Imperial College London; London SW7 2AZ UK
dc.contributor.institutionDepartment of Physics and Centre for Plastic Electronics; Imperial College London; London SW7 2AZ UK
dc.contributor.institutionSPECIFIC IKC; College of Engineering, Swansea University; Baglan Bay Innovation Centre; Port Talbot, Swansea SA12 7AX UK
dc.contributor.institutionEPSRC UK National Mass Spectrometry Facility (NMSF); Swansea University Medical School; Singleton Park, Swansea SA2 8PP UK
kaust.personBaran, Derya
kaust.personMcCulloch, Iain
kaust.grant.numberOSR-2015-CRG4-2572
refterms.dateFOA2018-06-28T00:00:00Z
dc.date.published-online2017-06-28
dc.date.published-print2017-09


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