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dc.contributor.authorAndaji-Garmaroudi, Zahra
dc.contributor.authorAbdi-Jalebi, Mojtaba
dc.contributor.authorGuo, Dengyang
dc.contributor.authorMacPherson, Stuart
dc.contributor.authorSadhanala, Aditya
dc.contributor.authorTennyson, Beth
dc.contributor.authorRuggeri, Edoardo
dc.contributor.authorAnaya, Miguel
dc.contributor.authorGalkowski, Krzysztof
dc.contributor.authorShivanna, Ravichandran
dc.contributor.authorLohmann, Kilian
dc.contributor.authorFrohna, Kyle
dc.contributor.authorMackowski, Sebastian
dc.contributor.authorSavenije, Tom J
dc.contributor.authorFriend, Richard
dc.contributor.authorStranks, Samuel
dc.date.accessioned2019-08-28T23:30:46Z
dc.date.available2019-08-28T23:30:46Z
dc.date.issued2019-10
dc.identifier.issn0935-9648
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/296227
dc.description.abstractMixed-halide lead perovskites have attracted significant attention in the field of photovoltaics and other optoelectronic applications due to their promising bandgap tunability and device performance. Here, the changes in photoluminescence and photoconductance of solution-processed triple-cation mixed-halide (Cs0.06 MA0.15 FA0.79 )Pb(Br0.4 I0.6 )3 perovskite films (MA: methylammonium, FA: formamidinium) are studied under solar-equivalent illumination. It is found that the illumination leads to localized surface sites of iodide-rich perovskite intermixed with passivating PbI2 material. Time- and spectrally resolved photoluminescence measurements reveal that photoexcited charges efficiently transfer to the passivated iodide-rich perovskite surface layer, leading to high local carrier densities on these sites. The carriers on this surface layer therefore recombine with a high radiative efficiency, with the photoluminescence quantum efficiency of the film under solar excitation densities increasing from 3% to over 45%. At higher excitation densities, nonradiative Auger recombination starts to dominate due to the extremely high concentration of charges on the surface layer. This work reveals new insight into phase segregation of mixed-halide mixed-cation perovskites, as well as routes to highly luminescent films by controlling charge density and transfer in novel device structures.
dc.format.mediumPrint-Electronic
dc.languageeng
dc.publisherWiley
dc.rightsAttribution 4.0 International (CC BY)
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleA Highly Emissive Surface Layer in Mixed-Halide Multication Perovskites.
dc.typeArticle
prism.issueIdentifier42
prism.publicationDate2019
prism.publicationNameAdv Mater
prism.startingPagee1902374
prism.volume31
dc.identifier.doi10.17863/CAM.43272
dcterms.dateAccepted2019-08-19
rioxxterms.versionofrecord10.1002/adma.201902374
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2019-10
dc.contributor.orcidMacPherson, Stuart [0000-0003-3758-1198]
dc.contributor.orcidTennyson, Beth [0000-0003-0071-8445]
dc.contributor.orcidRuggeri, Edoardo [0000-0002-2866-0612]
dc.contributor.orcidShivanna, Ravichandran [0000-0002-0915-6066]
dc.contributor.orcidFrohna, Kyle [0000-0002-2259-6154]
dc.contributor.orcidFriend, Richard [0000-0001-6565-6308]
dc.contributor.orcidStranks, Samuel [0000-0002-8303-7292]
dc.identifier.eissn1521-4095
rioxxterms.typeJournal Article/Review
pubs.funder-project-idLloyd's Register Foundation (via University of Southampton) (unknown)
pubs.funder-project-idEuropean Research Council (756962)
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/P032591/1)
pubs.funder-project-idEPSRC (via Brunel University London) (unknown)
pubs.funder-project-idRoyal Society (UF150033)
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/R023980/1)
pubs.funder-project-idEuropean Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (841386)
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/M005143/1)
pubs.funder-project-idEPSRC (1948703)
cam.issuedOnline2019-09-06
cam.orpheus.successThu Jan 30 10:39:55 GMT 2020 - Embargo updated
rioxxterms.freetoread.startdate2100-01-01


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Attribution 4.0 International (CC BY)
Except where otherwise noted, this item's licence is described as Attribution 4.0 International (CC BY)