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Influence of the Vibrational Modes from the Organic Moieties in 2D Lead Halides on Excitonic Recombination and Phase Transition

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cam.issuedOnline2020-10-27
cam.orpheus.successMon Nov 16 07:30:26 GMT 2020 - Embargo updated
dc.contributor.authorMoral, RF
dc.contributor.authorGermino, JC
dc.contributor.authorBonato, LG
dc.contributor.authorAlmeida, DB
dc.contributor.authorTherézio, EM
dc.contributor.authorAtvars, TDZ
dc.contributor.authorStranks, SD
dc.contributor.authorNome, RA
dc.contributor.authorNogueira, AF
dc.contributor.orcidNogueira, AF [0000-0002-0838-7962]
dc.date.accessioned2020-11-11T00:30:27Z
dc.date.available2020-11-11T00:30:27Z
dc.date.issued2020
dc.description.abstract<jats:title>Abstract</jats:title><jats:p>2D metal halide semiconductors have been intensively studied in the past few years due to their unique optical properties and potential for new‐generation photonic devices. Despite the large number of recent works, this class of materials is still in need of further understanding due to their complex structural and optical characteristics. In this work, a molecular‐level explanation for the dual band emission in the 2D (C<jats:sub>4</jats:sub>H<jats:sub>9</jats:sub>NH<jats:sub>3</jats:sub>)<jats:sub>2</jats:sub>PbI<jats:sub>4</jats:sub> in its bulk form is presented, demonstrating that this feature is caused by a strong exciton–phonon coupling. Temperature‐dependent photoluminescence with Raman and IR spectroscopies reveals that vibrations involving the C‐NH<jats:sub>3</jats:sub><jats:sup>+</jats:sup> butylammonium polar head are responsible for this exciton–phonon coupling. Additionally, experimental shifts in the mean phonon frequencies coupled with the electronic excitation, combined with a theoretical model, show that these vibrational modes present a soft‐mode behavior in the phase transition of this material.</jats:p>
dc.identifier.doi10.17863/CAM.59847
dc.identifier.eissn2195-1071
dc.identifier.issn2195-1071
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/312746
dc.language.isoeng
dc.publisherWiley
dc.publisher.urlhttp://dx.doi.org/10.1002/adom.202001431
dc.rightsAll rights reserved
dc.subject2D metal halides
dc.subjectexciton dynamics
dc.subjectexciton&#8211
dc.subjectphonon coupling
dc.subjectphase transition
dc.subjectsoft modes
dc.titleInfluence of the Vibrational Modes from the Organic Moieties in 2D Lead Halides on Excitonic Recombination and Phase Transition
dc.typeArticle
prism.issueIdentifier24
prism.publicationDate2020
prism.publicationNameAdvanced Optical Materials
prism.volume8
pubs.funder-project-idRoyal Society (UF150033)
rioxxterms.licenseref.startdate2020-12-01
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.typeJournal Article/Review
rioxxterms.versionAM
rioxxterms.versionofrecord10.1002/adom.202001431

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