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dc.contributor.authorCha, Hyojung
dc.contributor.authorWheeler, Scot
dc.contributor.authorHolliday, Sarah
dc.contributor.authorDimitrov, Stoichko D.
dc.contributor.authorWadsworth, Andrew
dc.contributor.authorLee, Hyun Hwi
dc.contributor.authorBaran, Derya
dc.contributor.authorMcCulloch, Iain
dc.contributor.authorDurrant, James R.
dc.date.accessioned2018-01-01T12:19:04Z
dc.date.available2018-01-01T12:19:04Z
dc.date.issued2017-11-27
dc.identifier.citationCha H, Wheeler S, Holliday S, Dimitrov SD, Wadsworth A, et al. (2017) Influence of Blend Morphology and Energetics on Charge Separation and Recombination Dynamics in Organic Solar Cells Incorporating a Nonfullerene Acceptor. Advanced Functional Materials 28: 1704389. Available: http://dx.doi.org/10.1002/adfm.201704389.
dc.identifier.issn1616-301X
dc.identifier.doi10.1002/adfm.201704389
dc.identifier.urihttp://hdl.handle.net/10754/626631
dc.description.abstractNonfullerene acceptors (NFAs) in blends with highly crystalline donor polymers have been shown to yield particularly high device voltage outputs, but typically more modest quantum yields for photocurrent generation as well as often lower fill factors (FF). In this study, we employ transient optical and optoelectronic analysis to elucidate the factors determining device photocurrent and FF in blends of the highly crystalline donor polymer PffBT4T-2OD with the promising NFA FBR or the more widely studied fullerene acceptor PC71BM. Geminate recombination losses, as measured by ultrafast transient absorption spectroscopy, are observed to be significantly higher for PffBT4T-2OD:FBR blends. This is assigned to the smaller LUMO-LUMO offset of the PffBT4T-2OD:FBR blends relative to PffBT4T-2OD:PC71BM, resulting in the lower photocurrent generation efficiency obtained with FBR. Employing time delayed charge extraction measurements, these geminate recombination losses are observed to be field dependent, resulting in the lower FF observed with PffBT4T-2OD:FBR devices. These data therefore provide a detailed understanding of the impact of acceptor design, and particularly acceptor energetics, on organic solar cell performance. Our study concludes with a discussion of the implications of these results for the design of NFAs in organic solar cells.
dc.description.sponsorshipThe authors gratefully acknowledge funding supported by KAUST under the Grant agreement number OSR-2015-CRG4-2572, the EU FP7 project CHEETAH and BASF. This work is partially funded by the European Regional development fund through the Welsh government.
dc.publisherWiley-Blackwell
dc.relation.urlhttp://onlinelibrary.wiley.com/doi/10.1002/adfm.201704389/full
dc.rightsThis is the peer reviewed version of the following article: Influence of Blend Morphology and Energetics on Charge Separation and Recombination Dynamics in Organic Solar Cells Incorporating a Nonfullerene Acceptor, which has been published in final form at http://doi.org/10.1002/adfm.201704389. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
dc.subjectField-dependent generation
dc.subjectGeminate recombination
dc.subjectNonfullerene acceptors
dc.subjectNongeminate recombination
dc.subjectOrganic solar cells
dc.titleInfluence of Blend Morphology and Energetics on Charge Separation and Recombination Dynamics in Organic Solar Cells Incorporating a Nonfullerene Acceptor
dc.typeArticle
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentChemical Science Program
dc.identifier.journalAdvanced Functional Materials
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Chemistry and Centre for Plastic Electronics; Imperial College London; London SW7 2AZ UK
dc.contributor.institutionSPECIFIC IKC; College of Engineering; Swansea University; Swansea SA2 7AX UK
dc.contributor.institutionPohang Accelerator Laboratory POSTECH; Pohang Gyeongbuk 37673 Republic of Korea
kaust.personBaran, Derya
kaust.personMcCulloch, Iain
kaust.grant.numberOSR-2015-CRG4-2572


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