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dc.contributor.authorKaruthedath, Safakath
dc.contributor.authorFirdaus, Yuliar
dc.contributor.authorLiang, Ru-Ze
dc.contributor.authorGorenflot, Julien
dc.contributor.authorBeaujuge, Pierre
dc.contributor.authorAnthopoulos, Thomas D.
dc.contributor.authorLaquai, Frédéric
dc.date.accessioned2019-08-18T12:20:45Z
dc.date.available2019-08-18T12:20:45Z
dc.date.issued2019-07-22
dc.identifier.citationKaruthedath, S., Firdaus, Y., Liang, R., Gorenflot, J., Beaujuge, P. M., Anthopoulos, T. D., & Laquai, F. (2019). Impact of Fullerene on the Photophysics of Ternary Small Molecule Organic Solar Cells. Advanced Energy Materials, 1901443. doi:10.1002/aenm.201901443
dc.identifier.doi10.1002/aenm.201901443
dc.identifier.urihttp://hdl.handle.net/10754/656470
dc.description.abstractTernary organic solar cells (OSCs) are among the best-performing organic photovoltaic devices to date, largely due to the recent development of nonfullerene acceptors. However, fullerene molecules still play an important role in ternary OSC systems, since, for reasons not well understood, they often improve the device performance, despite their lack of absorption. Here, the photophysics of a prototypical ternary small-molecule OSC blend composed of the donor DR3, the nonfullerene acceptor ICC6, and the fullerene derivative PC71BM is studied by ultrafast spectroscopy. Surprisingly, it is found that after excitation of PC71BM, ultrafast singlet energy transfer to ICC6 competes efficiently with charge transfer. Subsequently, singlets on ICC6 undergo hole transfer to DR3, resulting in free charge generation. Interestingly, PC71BM improves indirectly the electron mobility of the ternary blend, while electrons reside predominantly in ICC6 domains as indicated by fast spectroscopy. The improved mobility facilitates charge carrier extraction, in turn leading to higher device efficiencies of the ternary compared to binary solar cells. Using the (photo)physical parameters obtained from (transient) spectroscopy and charge transport measurements, the device's current–voltage characteristics are simulated and it is demonstrated that the parameters accurately reproduce the experimentally measured device performance.
dc.description.sponsorshipThis publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No: OSR-2018-CARF/CCF-3079
dc.publisherWiley
dc.relation.urlhttps://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.201901443
dc.rightsArchived with thanks to Advanced Energy Materials
dc.subjectbulk heterojunction
dc.subjectcharge generation
dc.subjectenergy transfer
dc.subjectfullerene
dc.subjectternary organic solar cells
dc.subjectultrafast spectroscopy
dc.titleImpact of Fullerene on the Photophysics of Ternary Small Molecule Organic Solar Cells
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentMaterial Science and Engineering Program (MSE),Physical Sciences and Engineering Division (PSE), KAUST Solar Center (KSC), King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalAdvanced Energy Materials
dc.rights.embargodate2020-07-22
dc.eprint.versionPost-print
kaust.personKaruthedath, Safakath
kaust.personFirdaus, Yuliar
kaust.personLiang, Ru-Ze
kaust.personGorenflot, Julien
kaust.personBeaujuge, Pierre
kaust.personAnthopoulos, Thomas D.
kaust.personLaquai, Frederic
kaust.grant.numberOSR-2018-CARF/CCF-3079
refterms.dateFOA2020-07-22T00:00:00Z
kaust.acknowledged.supportUnitCCF
kaust.acknowledged.supportUnitOffice of Sponsored Research (OSR)


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