Strong carrier-phonon coupling in lead halide perovskite nanocrystals

C.M. Iaru, J.J. Geuchies, P.M. Koenraad, D.A.M. Vanmaekelbergh, A.Y. Silov

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

31 Citaties (Scopus)

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We highlight the importance of carrier-phonon coupling in inorganic lead halide perovskite nanocrystals. The low-temperature photoluminescence (PL) spectrum of CsPbBr3 has been investigated under a nonresonant and a nonstandard, quasi-resonant excitation scheme, and phonon replicas of the main PL band have been identified as due to the Fröhlich interaction. The energy of longitudinal optical (LO) phonons has been determined from the separation of the zero phonon band and phonon replicas. We reason that the observed LO phonon coupling can only be related to an orthorhombically distorted crystal structure of the perovskite nanocrystals. Additionally, the strength of carrier-phonon coupling has been characterized using the ratio between the intensities of the first phonon replica and the zero-phonon band. PL emission from localized versus delocalized carriers has been identified as the source of the observed discrepancies between the LO phonon energy and phonon coupling strength under quasi-resonant and nonresonant excitation conditions, respectively.

TaalEngels
Pagina's11024-11030
Aantal pagina's7
TijdschriftACS Nano
Volume11
Nummer van het tijdschrift11
DOI's
StatusGepubliceerd - 28 nov 2017

Vingerafdruk

Perovskite
Nanocrystals
halides
Photoluminescence
nanocrystals
Lead
replicas
photoluminescence
Phonons
Crystal structure
excitation
phonons
crystal structure
perovskite
energy
Temperature
interactions

Trefwoorden

    Citeer dit

    Iaru, C.M. ; Geuchies, J.J. ; Koenraad, P.M. ; Vanmaekelbergh, D.A.M. ; Silov, A.Y./ Strong carrier-phonon coupling in lead halide perovskite nanocrystals. In: ACS Nano. 2017 ; Vol. 11, Nr. 11. blz. 11024-11030
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    abstract = "We highlight the importance of carrier-phonon coupling in inorganic lead halide perovskite nanocrystals. The low-temperature photoluminescence (PL) spectrum of CsPbBr3 has been investigated under a nonresonant and a nonstandard, quasi-resonant excitation scheme, and phonon replicas of the main PL band have been identified as due to the Fr{\"o}hlich interaction. The energy of longitudinal optical (LO) phonons has been determined from the separation of the zero phonon band and phonon replicas. We reason that the observed LO phonon coupling can only be related to an orthorhombically distorted crystal structure of the perovskite nanocrystals. Additionally, the strength of carrier-phonon coupling has been characterized using the ratio between the intensities of the first phonon replica and the zero-phonon band. PL emission from localized versus delocalized carriers has been identified as the source of the observed discrepancies between the LO phonon energy and phonon coupling strength under quasi-resonant and nonresonant excitation conditions, respectively.",
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    Strong carrier-phonon coupling in lead halide perovskite nanocrystals. / Iaru, C.M.; Geuchies, J.J.; Koenraad, P.M.; Vanmaekelbergh, D.A.M.; Silov, A.Y.

    In: ACS Nano, Vol. 11, Nr. 11, 28.11.2017, blz. 11024-11030.

    Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

    TY - JOUR

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    AU - Iaru,C.M.

    AU - Geuchies,J.J.

    AU - Koenraad,P.M.

    AU - Vanmaekelbergh,D.A.M.

    AU - Silov,A.Y.

    PY - 2017/11/28

    Y1 - 2017/11/28

    N2 - We highlight the importance of carrier-phonon coupling in inorganic lead halide perovskite nanocrystals. The low-temperature photoluminescence (PL) spectrum of CsPbBr3 has been investigated under a nonresonant and a nonstandard, quasi-resonant excitation scheme, and phonon replicas of the main PL band have been identified as due to the Fröhlich interaction. The energy of longitudinal optical (LO) phonons has been determined from the separation of the zero phonon band and phonon replicas. We reason that the observed LO phonon coupling can only be related to an orthorhombically distorted crystal structure of the perovskite nanocrystals. Additionally, the strength of carrier-phonon coupling has been characterized using the ratio between the intensities of the first phonon replica and the zero-phonon band. PL emission from localized versus delocalized carriers has been identified as the source of the observed discrepancies between the LO phonon energy and phonon coupling strength under quasi-resonant and nonresonant excitation conditions, respectively.

    AB - We highlight the importance of carrier-phonon coupling in inorganic lead halide perovskite nanocrystals. The low-temperature photoluminescence (PL) spectrum of CsPbBr3 has been investigated under a nonresonant and a nonstandard, quasi-resonant excitation scheme, and phonon replicas of the main PL band have been identified as due to the Fröhlich interaction. The energy of longitudinal optical (LO) phonons has been determined from the separation of the zero phonon band and phonon replicas. We reason that the observed LO phonon coupling can only be related to an orthorhombically distorted crystal structure of the perovskite nanocrystals. Additionally, the strength of carrier-phonon coupling has been characterized using the ratio between the intensities of the first phonon replica and the zero-phonon band. PL emission from localized versus delocalized carriers has been identified as the source of the observed discrepancies between the LO phonon energy and phonon coupling strength under quasi-resonant and nonresonant excitation conditions, respectively.

    KW - carrier localization

    KW - crystal phase

    KW - Fröhlich interaction

    KW - nanocrystals

    KW - perovskite

    KW - phonon

    KW - photoluminescence

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    U2 - 10.1021/acsnano.7b05033

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    Iaru CM, Geuchies JJ, Koenraad PM, Vanmaekelbergh DAM, Silov AY. Strong carrier-phonon coupling in lead halide perovskite nanocrystals. ACS Nano. 2017 nov 28;11(11):11024-11030. Beschikbaar vanaf, DOI: 10.1021/acsnano.7b05033