Research output: Contribution to journal › Article › peer-review
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: Contribution to journal › Article › peer-review
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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.
KW - LEAD HALIDE PEROVSKITES
KW - BINDING-ENERGY
KW - TEMPERATURE-DEPENDENCE
KW - QUANTUM-WELLS
KW - PHOTOLUMINESCENCE
KW - METHYLAMMONIUM
KW - SEMICONDUCTORS
KW - FILMS
KW - CH3NH3PBBR3
KW - DYNAMICS
UR - http://www.scopus.com/inward/record.url?scp=85040698170&partnerID=8YFLogxK
UR - http://www.mendeley.com/research/low-inhomogeneous-broadening-excitonic-resonance-mapbbr3-single-crystals
U2 - 10.1021/acs.jpclett.7b02979
DO - 10.1021/acs.jpclett.7b02979
M3 - Article
AN - SCOPUS:85040698170
VL - 9
SP - 302
EP - 305
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
SN - 1948-7185
IS - 2
ER -
ID: 28208581