Low Inhomogeneous Broadening of Excitonic Resonance in MAPbBr3 Single Crystals

The Journal of Physical Chemistry Letters
Olga A LozhkinaDetlef W Bahnemann

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.

References

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Sep 24, 2014·Physical Chemistry Chemical Physics : PCCP·Kewei WuTom Wu
Nov 14, 2015·Scientific Reports·Zhipeng LianJia-Lin Sun
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Sep 27, 2016·Journal of the American Chemical Society·Ajay Ram Srimath KandadaGuglielmo Lanzani
Apr 15, 2017·Physical Review Letters·Omer YaffeLouis E Brus

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Citations

Jan 28, 2021·Journal of the American Chemical Society·Hongsun RyuJoon I Jang
Feb 7, 2019·The Journal of Physical Chemistry Letters·Han LiuJiehua Liu

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