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dc.contributor.authorRoose, Bart
dc.contributor.authorDey, Krishanu
dc.contributor.authorChiang, Yu-Hsien
dc.contributor.authorFriend, Richard
dc.contributor.authorStranks, Samuel
dc.date.accessioned2020-07-23T23:30:44Z
dc.date.available2020-07-23T23:30:44Z
dc.date.issued2020-08-20
dc.identifier.issn1948-7185
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/308343
dc.description.abstractIt is common practice in the lead halide perovskite solar cell field to add a small molar excess of lead iodide (PbI2) to the precursor solution to increase the device performance. However, recent reports have shown that an excess of PbI2 can accelerate performance loss. In addition, PbI2 is photoactive (band gap ∼2.3 eV), which may lead to parasitic absorption losses in a solar cell. Here we show that devices using small quantities of excess PbI2 exhibit better device performance as compared with stoichiometric devices, both initially and for the duration of a stability test under operating conditions, primarily by enhancing the charge extraction. However, the photolysis of PbI2 negates the beneficial effect on charge extraction by leaving voids in the perovskite film and introduces trap states that are detrimental for device performance. We propose that although excess PbI2 provides a good template for enhanced performance, the community must continue to seek other additives or synthesis routes that fulfill the same beneficial role as excess PbI2, but without the photolysis that negates these beneficial effects under long-term device operation.
dc.format.mediumPrint-Electronic
dc.languageeng
dc.publisherAmerican Chemical Society (ACS)
dc.rightsAttribution 4.0 International (CC BY)
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleCritical Assessment of the Use of Excess Lead Iodide in Lead Halide Perovskite Solar Cells.
dc.typeArticle
prism.endingPage6512
prism.issueIdentifier16
prism.publicationDate2020
prism.publicationNameJ Phys Chem Lett
prism.startingPage6505
prism.volume11
dc.identifier.doi10.17863/CAM.55435
dcterms.dateAccepted2020-07-22
rioxxterms.versionofrecord10.1021/acs.jpclett.0c01820
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2020-08
dc.contributor.orcidRoose, Bart [0000-0002-0972-1475]
dc.contributor.orcidFriend, Richard [0000-0001-6565-6308]
dc.contributor.orcidStranks, Samuel [0000-0002-8303-7292]
dc.identifier.eissn1948-7185
rioxxterms.typeJournal Article/Review
pubs.funder-project-idRoyal Society (UF150033)
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/R023980/1)
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/M005143/1)
pubs.funder-project-idRoyal Society (NF170520)
pubs.funder-project-idEPSRC (EP/T02030X/1)
pubs.funder-project-idEuropean Research Council (756962)
cam.issuedOnline2020-07-22
datacite.issupplementedby.urlhttps://doi.org/10.17863/CAM.55401
cam.orpheus.successTue Jul 28 09:04:52 BST 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)