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dc.contributor.authorKaruthedath, Safakath
dc.contributor.authorGorenflot, Julien
dc.contributor.authorFirdaus, Yuliar
dc.contributor.authorSit, Wai-Yu
dc.contributor.authorEisner, Flurin
dc.contributor.authorSeitkhan, Akmaral
dc.contributor.authorRavva, Mahesh Kumar
dc.contributor.authorAnthopoulos, Thomas D.
dc.contributor.authorLaquai, Frédéric
dc.date.accessioned2018-11-13T06:59:27Z
dc.date.available2018-11-13T06:59:27Z
dc.date.issued2018-11-08
dc.identifier.citationKaruthedath S, Gorenflot J, Firdaus Y, Sit W-Y, Eisner F, et al. (2018) Charge and Triplet Exciton Generation in Neat PC70\nBM Films and Hybrid CuSCN:PC70\nBM Solar Cells. Advanced Energy Materials: 1802476. Available: http://dx.doi.org/10.1002/aenm.201802476.
dc.identifier.issn1614-6832
dc.identifier.doi10.1002/aenm.201802476
dc.identifier.urihttp://hdl.handle.net/10754/629866
dc.description.abstractOrganic solar cells that use only fullerenes as the photoactive material exhibit poor exciton-to-charge conversion efficiencies, resulting in low internal quantum efficiencies (IQE). However, the IQE can be greatly improved, when copper(I) thiocyanate (CuSCN) is used as a carrier-selective interlayer between the phenyl-C70-butyric acid methyl ester (PC70BM) layer and the anode. Efficiencies of ≈5.4% have recently been reported for optimized CuSCN:PC70BM (1:3)-mesostructured heterojunctions, yet the reasons causing the efficiency boost remain unclear. Here, transient absorption (TA) spectroscopy is used to demonstrate that CuSCN does not only act as a carrier-selective electrode layer, but also facilitates fullerene exciton dissociation and hole transfer at the interface with PC70BM. While intrinsic charge generation in neat PC70BM films proceeds with low yield, hybrid films exhibit much improved exciton dissociation due to the presence of abundant interfaces. Triplet generation with a rate proportional to the product of singlet and charge concentrations is observed in neat PC70BM films, implying a charge–singlet spin exchange mechanism, while in hybrid films, this mechanism is absent and triplet formation is a consequence of nongeminate recombination of free charges. At low carrier concentrations, the fraction of charges outweighs the population of triplets, leading to respectable device efficiencies under one sun illumination.
dc.description.sponsorshipS.K. and J.G. contributed equally to this work. The research reported in this publication was supported by funding from the King Abdullah University of Science and Technology (KAUST).
dc.publisherWiley
dc.relation.urlhttps://onlinelibrary.wiley.com/doi/full/10.1002/aenm.201802476
dc.rightsArchived with thanks to Advanced Energy Materials
dc.subjectcopper thiocyanate
dc.subjectfullerene
dc.subjecthybrid solar cells
dc.subjecttransient absorption spectroscopy
dc.subjecttriplet exciton
dc.titleCharge and Triplet Exciton Generation in Neat PC70\nBM Films and Hybrid CuSCN:PC70\nBM Solar Cells
dc.typeArticle
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; Imperial College London; South Kensington London SW7 2AZ UK
dc.contributor.institutionDepartment of Chemistry; SRM University-AP; Amaravati 522502 India
kaust.personKaruthedath, Safakath
kaust.personGorenflot, Julien
kaust.personFirdaus, Yuliar
kaust.personSeitkhan, Akmaral
kaust.personRavva, Mahesh Kumar
kaust.personAnthopoulos, Thomas D.
kaust.personLaquai, Frederic
refterms.dateFOA2018-11-13T07:02:46Z
dc.date.published-online2018-11-08
dc.date.published-print2019-01


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