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dc.contributor.authorMondal, Navendu
dc.contributor.authorNaphade, Rounak
dc.contributor.authorZhou, Xiaohe
dc.contributor.authorZheng, Yangzi
dc.contributor.authorLee, Kwangjae
dc.contributor.authorGereige, Issam
dc.contributor.authorAl-Saggaf, Ahmed
dc.contributor.authorBakr, Osman
dc.contributor.authorMohammed, Omar F.
dc.contributor.authorGartstein, Yuri N.
dc.contributor.authorMalko, Anton V.
dc.date.accessioned2020-02-02T12:30:44Z
dc.date.available2020-02-02T12:30:44Z
dc.date.issued2020-01-20
dc.date.submitted2019-12-15
dc.identifier.citationMondal, N., Naphade, R., Zhou, X., Zheng, Y., Lee, K., Gereige, I., … Malko, A. V. (2020). Dynamical Interconversion between Excitons and Geminate Charge Pairs in Two-Dimensional Perovskite Layers Described by the Onsager–Braun Model. The Journal of Physical Chemistry Letters, 1112–1119. doi:10.1021/acs.jpclett.9b03709
dc.identifier.doi10.1021/acs.jpclett.9b03709
dc.identifier.urihttp://hdl.handle.net/10754/661347
dc.description.abstractTime-resolved photoluminescence (PL) and femtosecond transient absorption (TA) spectroscopy are employed to study the photoexcitation dynamics in a highly emissive two-dimensional perovskite compound (en)4Pb2Br9·3Br with the ethylene diammonium (en) spacer. We find that while the PL kinetics is substantially T-dependent over the whole range of studied temperatures T ∼ 77-350 K, the PL quantum yield remains remarkably nearly T-independent up to T ∼ 280-290 K, appreciably decreasing only at higher temperatures. Considerable differences are also revealed between the TA spectra and the responses to the excitation power at low and at room temperatures. Numerical solutions of Onsager-Braun-type kinetic-diffusion equations illustrate that the salient features of the experimental observations are consistent with the picture of a T-dependent dynamic interplay between tightly bound emissive excitons and larger-size, loosely bound, nonemissive geminate charge pairs arising already at earlier relaxation times. The geminate pairs play the role of
dc.description.sponsorshipThe work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under Award No. DE-SC0010697.
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttps://pubs.acs.org/doi/10.1021/acs.jpclett.9b03709
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in The journal of physical chemistry letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.jpclett.9b03709.
dc.titleDynamical Interconversion between Excitons and Geminate Charge Pairs in Two-Dimensional Perovskite Layers Described by the Onsager-Braun Model.
dc.typeArticle
dc.contributor.departmentChemical Science Program
dc.contributor.departmentFunctional Nanomaterials Lab (FuNL)
dc.contributor.departmentKAUST Catalysis Center (KCC)
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentUltrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
dc.identifier.journalThe journal of physical chemistry letters
dc.rights.embargodate2021-01-21
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Physics , The University of Texas at Dallas , Richardson , Texas 75080 , United States.
dc.contributor.institutionSaudi Aramco Research & Development Center , Dhahran 31311 , Kingdom of Saudi Arabia.
kaust.personNaphade, Rounak
kaust.personLee, Kwangjae
kaust.personBakr, Osman M.
kaust.personMohammed, Omar F.
dc.date.accepted2020-01-20
refterms.dateFOA2020-02-03T05:31:46Z
dc.date.published-online2020-01-20
dc.date.published-print2020-02-06


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