| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Doublet luminescence due to coexistence of excitons and electron-hole plasmas in optically excited CH3NH3PbBr3 single crystal |
| Jie Wang(王杰)1, Guang-Zhe Ma(马广哲)1, Lu Cao(曹露)1, Min Gao(高敏)2, and Dong Shi(石东)1,† |
1 School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China;
2 School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China |
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Abstract Doublet luminescence from hybrid metal trihalide perovskite semiconductors is observed along with materials processing when high-quality single crystals are obtainable. Yet, the underlying physical mechanism remains poorly understood. Here, we report controllable solution-processed crystallization that affords high-quality CH3NH3PbBr3 single crystals with atomically flat pristine surfaces. Front-face photoluminescence (PL) shows doublet luminescence components with variable relative intensities depending on the crystal surface conditions. We further find that the low-energy PL component with asymmetric spectral line-shape becomes predominant when the atomically flat crystal surfaces are passivated in the ion-abundant saturated solutions, while poor-quality single crystal with visually rough surface only gives the high-energy PL with symmetric line-shape. The asymmetric spectral line-shape of the low-energy PL matches perfectly with the simulated bandedge emission. Therefore, the low-energy PL component is attributable to the intrinsic bandedge emission from the crystal bulk while the high-energy one to surface-specific emission. Elliott fitting to the absorption data and multi-exponential fitting to the time-resolved photoluminescence traces jointly indicate the coexistence of excitons and electron-hole plasmas in optically excited CH3NH3PbBr3 single crystals, thereby catching the physical merit that leads to the occurrence of doublet luminescence.
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Received: 21 June 2021
Revised: 30 August 2021
Accepted manuscript online: 24 September 2021
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PACS:
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71.10.Li
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(Excited states and pairing interactions in model systems)
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71.20.Nr
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(Semiconductor compounds)
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71.15.Qe
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(Excited states: methodology)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51872038). |
Corresponding Authors:
Dong Shi
E-mail: dshi@uestc.edu.cn
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Cite this article:
Jie Wang(王杰), Guang-Zhe Ma(马广哲), Lu Cao(曹露), Min Gao(高敏), and Dong Shi(石东) Doublet luminescence due to coexistence of excitons and electron-hole plasmas in optically excited CH3NH3PbBr3 single crystal 2022 Chin. Phys. B 31 047104
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