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dc.contributor.authorPéan, Emmanuel V
dc.contributor.authorDimitrov, Stoichko
dc.contributor.authorDe Castro, Catherine Suenne
dc.contributor.authorDavies, Matthew L
dc.date.accessioned2020-12-13T13:36:19Z
dc.date.available2020-12-13T13:36:19Z
dc.date.issued2020-12-10
dc.date.submitted2020-09-18
dc.identifier.citationPéan, E. V., Dimitrov, S., De Castro, C. S., & Davies, M. L. (2020). Interpreting time-resolved photoluminescence of perovskite materials. Physical Chemistry Chemical Physics. doi:10.1039/d0cp04950f
dc.identifier.issn1463-9076
dc.identifier.pmid33300902
dc.identifier.doi10.1039/d0cp04950f
dc.identifier.urihttp://hdl.handle.net/10754/666342
dc.description.abstractTime-resolved photoluminescence (TRPL) spectroscopy is a powerful technique to investigate excited charge carrier recombinations in semiconductors and molecular systems. The analysis of the TRPL decays of many molecular systems (e.g. molecules and organic materials) is usually fairly straightfoward and can be fitted with an exponential function allowing extraction of the rate constants. Due to the non-excitonic nature of charge carriers in lead halide perovskite materials coupled with the presence of localised trap states in their band-gap, the TRPL of these materials is much more complicated to interpret. Here we discuss two models used in the literature to simulate charge carrier recombinations and TRPL in perovskites. These models consider the bimolecular nature of direct electron-hole recombination but differ in their treatment of trap-mediated recombination with one model describing trapping as a monomolecular process whereas the other as a bimolecular process between free carriers and the available trap states. In comparison, the classical analysis of perovskite TRPL decay curves (using a sum of exponentials) can lead to misinterpretation. Here we offer some recommendations for meaningful measurements of lead halide perovskite thin-films. The fluence dependence as well as charge carrier accumulation due to incomplete depopulation of all photoexcited carriers between consecutive excitation pulses are discussed for both models.
dc.description.sponsorshipWe are grateful for the financial support of the EPSRC (EP/R016666/1 and EP/S001336/1) and both the EPSRC and Innovate UK for the SPECIFIC Innovation and Knowledge Centre and the European Regional Development Fund through the Welsh Government for support to the Seˆr Solar program. MLD is grateful for funding through the EPSRC GCRF SUNRISE project (EP/P032591/1). We would like to acknowledge the assistance provided by the European Regional Development Fund through the Welsh Government (80708), the Ser Solar project via Welsh Government and Edinburgh Instruments.
dc.publisherRoyal Society of Chemistry (RSC)
dc.relation.urlhttp://xlink.rsc.org/?DOI=D0CP04950F
dc.rightsArchived with thanks to Physical chemistry chemical physics : PCCP
dc.titleInterpreting time-resolved photoluminescence of perovskite materials.
dc.typeArticle
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalPhysical chemistry chemical physics : PCCP
dc.rights.embargodate2021-12-10
dc.eprint.versionPost-print
dc.contributor.institutionSPECIFIC IKC
dc.contributor.institutionMaterials Research Centre
dc.contributor.institutionCollege of Engineering
dc.contributor.institutionSwansea University Bay Campus
dc.contributor.institutionSwansea SA1 8EN
dc.contributor.institutionSchool of Biological and Chemical Sciences
dc.contributor.institutionQueen 58 Mary University of London
dc.contributor.institutionLondon E1 4NS
dc.contributor.institutionUK
dc.contributor.institutionKingdom of Saudi Arabia
kaust.personDe Castro, Catherine Suenne
kaust.personDe Castro, Catherine Suenne
dc.date.accepted2020-11-19
refterms.dateFOA2020-12-15T10:40:09Z


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