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Article: Local Phonon Modes Concerned with the Self-Trapped Exciton State in CsPbBr3 Nanocrystals

TitleLocal Phonon Modes Concerned with the Self-Trapped Exciton State in CsPbBr3 Nanocrystals
Authors
Issue Date2020
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journals/jpccck/
Citation
The Journal of Physical Chemistry C, 2020, v. 124 n. 49, p. 27130-27135 How to Cite?
AbstractThe exciton-phonon coupling plays a significant role in the optical property of lead halide perovskite semiconductors, but the concerned phonon modes have not been well identified. Under the resonant excitation and low temperature conditions, strong and sharp Raman signals in CsPbBr3 nanocrystals (NCs) were found to superimpose on the fluorescence band of the free exciton, including both Stokes and anti-Stokes signals. Also, two basic phonon modes with energies of 3.7 and 6.3 meV were obtained, respectively. At the same time, the emission band from the self-trapped exciton (STE) recombination was clearly observed under the weak excitation conditions. The Raman signals and STE band show very high similarity in temperature dependence. Both of them decrease quickly with the rise of temperature from 10 to 50 K and then tend to vanish at higher temperatures. Therefore, the two phonon modes are proposed to be concerned with the STE state.
Persistent Identifierhttp://hdl.handle.net/10722/295457
ISSN
2020 Impact Factor: 4.126
2015 SCImago Journal Rankings: 1.995
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorMa, X-
dc.contributor.authorShen, P-
dc.contributor.authorWang, YN-
dc.contributor.authorPan, F-
dc.contributor.authorChen, G-
dc.contributor.authorXu, S-
dc.contributor.authorYe, H-
dc.date.accessioned2021-01-25T11:15:11Z-
dc.date.available2021-01-25T11:15:11Z-
dc.date.issued2020-
dc.identifier.citationThe Journal of Physical Chemistry C, 2020, v. 124 n. 49, p. 27130-27135-
dc.identifier.issn1932-7447-
dc.identifier.urihttp://hdl.handle.net/10722/295457-
dc.description.abstractThe exciton-phonon coupling plays a significant role in the optical property of lead halide perovskite semiconductors, but the concerned phonon modes have not been well identified. Under the resonant excitation and low temperature conditions, strong and sharp Raman signals in CsPbBr3 nanocrystals (NCs) were found to superimpose on the fluorescence band of the free exciton, including both Stokes and anti-Stokes signals. Also, two basic phonon modes with energies of 3.7 and 6.3 meV were obtained, respectively. At the same time, the emission band from the self-trapped exciton (STE) recombination was clearly observed under the weak excitation conditions. The Raman signals and STE band show very high similarity in temperature dependence. Both of them decrease quickly with the rise of temperature from 10 to 50 K and then tend to vanish at higher temperatures. Therefore, the two phonon modes are proposed to be concerned with the STE state.-
dc.languageeng-
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journals/jpccck/-
dc.relation.ispartofThe Journal of Physical Chemistry C-
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in [JournalTitle], copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [insert ACS Articles on Request author-directed link to Published Work, see http://pubs.acs.org/page/policy/articlesonrequest/index.html].-
dc.titleLocal Phonon Modes Concerned with the Self-Trapped Exciton State in CsPbBr3 Nanocrystals-
dc.typeArticle-
dc.identifier.emailXu, S: sjxu@hku.hk-
dc.identifier.authorityXu, S=rp00821-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/acs.jpcc.0c07879-
dc.identifier.hkuros321003-
dc.identifier.volume124-
dc.identifier.issue49-
dc.identifier.spage27130-
dc.identifier.epage27135-
dc.identifier.isiWOS:000599610500064-
dc.publisher.placeUnited States-

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