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.

N1 - Funding information: The present study was performed within the Project “Establishment of the Laboratory “Photoactive Nanocomposite Materials” No. 14.Z50.31.0016 supported by a Mega-grant of the Government of the Russian Federation. Y.V.K. and O.A.L. acknowledge the Russian Science Foundation (Grant 17-72-10070). The work was carried out using equipment of the resource centers “Nanophotonics”, “Geomodel”, and “Centre for Optical and Laser Materials Research” of Saint-Petersburg State University.

PY - 2018/1/18

Y1 - 2018/1/18

N2 - We present an optical study of MAPbBr 3 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 MAPbBr 3. 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 MAPbBr 3 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 MAPbBr 3. 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.

UR - http://www.scopus.com/inward/record.url?scp=85040698170&partnerID=8YFLogxK

U2 - 10.48550/arXiv.1711.07648

DO - 10.48550/arXiv.1711.07648

M3 - Article

VL - 9

SP - 302

EP - 305

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

SN - 1948-7185

IS - 2

ER -