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Low Inhomogeneous Broadening of Excitonic Resonance in MAPbBr3 Single Crystals
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-01-04 00:00:00 , DOI: 10.1021/acs.jpclett.7b02979 Olga A. Lozhkina 1 , Vyacheslav I. Yudin 1 , Anna A. Murashkina 1 , Vladimir V. Shilovskikh 1 , Valentin G. Davydov 1 , Ruslan Kevorkyants 1 , Alexei V. Emeline 1 , Yury V. Kapitonov 1 , Detlef W. Bahnemann 1, 2
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-01-04 00:00:00 , DOI: 10.1021/acs.jpclett.7b02979 Olga A. Lozhkina 1 , Vyacheslav I. Yudin 1 , Anna A. Murashkina 1 , Vladimir V. Shilovskikh 1 , Valentin G. Davydov 1 , Ruslan Kevorkyants 1 , Alexei V. Emeline 1 , Yury V. Kapitonov 1 , Detlef W. Bahnemann 1, 2
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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.
中文翻译：
MAPbBr 3单晶中激子共振的非均质展宽
我们提出了从溶液中生长的MAPbBr 3单晶的光学研究。通过电子反向散射衍射确认了晶体Pm 3 m的对称性。我们的主要注意力集中在与MAPbBr 3中的激子态有关的光学效应上。。窄激子共振的光致发光温度依赖性显示出令人鼓舞的低不均质展宽Γ≈0.5 meV，这使人们能够区分来自自由激子的信号和源自局部缺陷的激子重组产生的信号。共振的激子起源是由其超线性泵浦强度依赖性证明的，与缺陷辅助复合带的线性行为相反。首次在高分辨率PL光谱中观察到了源自自由激子复合并伴随部分能量转移至声子的声子复制体，并通过独立的低温拉曼散射实验进行了证实。反过来，低温，低频拉曼散射研究使我们能够解析低频声子谱的结构。
更新日期：2018-01-04
中文翻译：
MAPbBr 3单晶中激子共振的非均质展宽
我们提出了从溶液中生长的MAPbBr 3单晶的光学研究。通过电子反向散射衍射确认了晶体Pm 3 m的对称性。我们的主要注意力集中在与MAPbBr 3中的激子态有关的光学效应上。。窄激子共振的光致发光温度依赖性显示出令人鼓舞的低不均质展宽Γ≈0.5 meV，这使人们能够区分来自自由激子的信号和源自局部缺陷的激子重组产生的信号。共振的激子起源是由其超线性泵浦强度依赖性证明的，与缺陷辅助复合带的线性行为相反。首次在高分辨率PL光谱中观察到了源自自由激子复合并伴随部分能量转移至声子的声子复制体，并通过独立的低温拉曼散射实验进行了证实。反过来，低温，低频拉曼散射研究使我们能够解析低频声子谱的结构。
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