Low Inhomogeneous Broadening of Excitonic Resonance in MAPbBr3 Single Crystals

Olga A. Lozhkina, Vyacheslav I. Yudin, Anna A. Murashkina, Vladimir V. Shilovskikh, Valentin G. Davydov, Ruslan Kevorkyants, Alexei V. Emeline, Yury V. Kapitonov, Detlef W. Bahnemann

Research output

6 Citations (Scopus)

Abstract

We present an optical study of MAPbBr3 single crystal grown from solution. The crystal Pm3m symmetry was confirmed by electron backscatter diffraction. Our major attention was focused on optical effects related to the excitonic states in MAPbBr3. Photoluminescence temperature dependence of narrow exciton resonance showed encouragingly low inhomogeneous broadening γ ≈ 0.5 meV that allows one to distinguish the signals from free excitons and those arising from recombination of excitons localized on defects. Excitonic origin of the resonance was proved by its superlinear pump intensity dependence, in contrast to the linear behavior of the defect-assisted recombination bands. For the first time, the phonon replicas originating from free exciton recombination accompanied by partial energy transfer to the phonons were observed in high-resolution PL spectra and confirmed by independent low-temperature Raman scattering experiments. In turn, low-temperature, low-frequency Raman scattering studies let us resolve the structure of the low-frequency phonon spectrum.

Original languageEnglish
Pages (from-to)302-305
Number of pages4
JournalJournal of Physical Chemistry Letters
Volume9
Issue number2
DOIs
Publication statusPublished - 18 Jan 2018

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Excitons
excitons
Single crystals
single crystals
Raman scattering
Raman spectra
low frequencies
Defects
defects
Crystal symmetry
Phonons
replicas
Electron diffraction
Energy transfer
Temperature
Photoluminescence
phonons
energy transfer
Pumps
pumps

Scopus subject areas

  • Materials Science(all)

Cite this

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title = "Low Inhomogeneous Broadening of Excitonic Resonance in MAPbBr3 Single Crystals",
abstract = "We present an optical study of MAPbBr3 single crystal grown from solution. The crystal Pm3m symmetry was confirmed by electron backscatter diffraction. Our major attention was focused on optical effects related to the excitonic states in MAPbBr3. Photoluminescence temperature dependence of narrow exciton resonance showed encouragingly low inhomogeneous broadening γ ≈ 0.5 meV that allows one to distinguish the signals from free excitons and those arising from recombination of excitons localized on defects. Excitonic origin of the resonance was proved by its superlinear pump intensity dependence, in contrast to the linear behavior of the defect-assisted recombination bands. For the first time, the phonon replicas originating from free exciton recombination accompanied by partial energy transfer to the phonons were observed in high-resolution PL spectra and confirmed by independent low-temperature Raman scattering experiments. In turn, low-temperature, low-frequency Raman scattering studies let us resolve the structure of the low-frequency phonon spectrum.",
author = "Lozhkina, {Olga A.} and Yudin, {Vyacheslav I.} and Murashkina, {Anna A.} and Shilovskikh, {Vladimir V.} and Davydov, {Valentin G.} and Ruslan Kevorkyants and Emeline, {Alexei V.} and Kapitonov, {Yury V.} and Bahnemann, {Detlef W.}",
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Low Inhomogeneous Broadening of Excitonic Resonance in MAPbBr3 Single Crystals. / Lozhkina, Olga A.; Yudin, Vyacheslav I.; Murashkina, Anna A.; Shilovskikh, Vladimir V.; Davydov, Valentin G.; Kevorkyants, Ruslan; Emeline, Alexei V.; Kapitonov, Yury V.; Bahnemann, Detlef W.

In: Journal of Physical Chemistry Letters, Vol. 9, No. 2, 18.01.2018, p. 302-305.

Research output

TY - JOUR

T1 - Low Inhomogeneous Broadening of Excitonic Resonance in MAPbBr3 Single Crystals

AU - Lozhkina, Olga A.

AU - Yudin, Vyacheslav I.

AU - Murashkina, Anna A.

AU - Shilovskikh, Vladimir V.

AU - Davydov, Valentin G.

AU - Kevorkyants, Ruslan

AU - Emeline, Alexei V.

AU - Kapitonov, Yury V.

AU - Bahnemann, Detlef W.

PY - 2018/1/18

Y1 - 2018/1/18

N2 - We present an optical study of MAPbBr3 single crystal grown from solution. The crystal Pm3m symmetry was confirmed by electron backscatter diffraction. Our major attention was focused on optical effects related to the excitonic states in MAPbBr3. Photoluminescence temperature dependence of narrow exciton resonance showed encouragingly low inhomogeneous broadening γ ≈ 0.5 meV that allows one to distinguish the signals from free excitons and those arising from recombination of excitons localized on defects. Excitonic origin of the resonance was proved by its superlinear pump intensity dependence, in contrast to the linear behavior of the defect-assisted recombination bands. For the first time, the phonon replicas originating from free exciton recombination accompanied by partial energy transfer to the phonons were observed in high-resolution PL spectra and confirmed by independent low-temperature Raman scattering experiments. In turn, low-temperature, low-frequency Raman scattering studies let us resolve the structure of the low-frequency phonon spectrum.

AB - We present an optical study of MAPbBr3 single crystal grown from solution. The crystal Pm3m symmetry was confirmed by electron backscatter diffraction. Our major attention was focused on optical effects related to the excitonic states in MAPbBr3. Photoluminescence temperature dependence of narrow exciton resonance showed encouragingly low inhomogeneous broadening γ ≈ 0.5 meV that allows one to distinguish the signals from free excitons and those arising from recombination of excitons localized on defects. Excitonic origin of the resonance was proved by its superlinear pump intensity dependence, in contrast to the linear behavior of the defect-assisted recombination bands. For the first time, the phonon replicas originating from free exciton recombination accompanied by partial energy transfer to the phonons were observed in high-resolution PL spectra and confirmed by independent low-temperature Raman scattering experiments. In turn, low-temperature, low-frequency Raman scattering studies let us resolve the structure of the low-frequency phonon spectrum.

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