中国物理B ›› 2023, Vol. 32 ›› Issue (11): 117802-117802.doi: 10.1088/1674-1056/ad028e

所属专题: SPECIAL TOPIC — Celebrating the 100th Anniversary of Physics Discipline of Northwest University

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Temperature-dependent photoluminescence of lead-free cesium tin halide perovskite microplates

Jiayu Tan(谭佳雨), Yixuan Zhou(周译玄), De Lu(卢德), Xukun Feng(冯旭坤), Yuqi Liu(刘玉琪), Mengen Zhang(张蒙恩), Fangzhengyi Lu(卢方正一), Yuanyuan Huang(黄媛媛), and Xinlong Xu(徐新龙)   

  1. Shaanxi Joint Laboratory of Graphene, State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, School of Physics, Northwest University, Xi'an 710069, China
  • 收稿日期:2023-07-04 修回日期:2023-09-13 接受日期:2023-10-12 出版日期:2023-10-16 发布日期:2023-11-03
  • 通讯作者: Yixuan Zhou E-mail:yxzhou@nwu.edu.cn;xlxuphy@nwu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11974279, 12074311, 12004310, and 12261141662).

Temperature-dependent photoluminescence of lead-free cesium tin halide perovskite microplates

Jiayu Tan(谭佳雨), Yixuan Zhou(周译玄), De Lu(卢德), Xukun Feng(冯旭坤), Yuqi Liu(刘玉琪), Mengen Zhang(张蒙恩), Fangzhengyi Lu(卢方正一), Yuanyuan Huang(黄媛媛), and Xinlong Xu(徐新龙)   

  1. Shaanxi Joint Laboratory of Graphene, State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, School of Physics, Northwest University, Xi'an 710069, China
  • Received:2023-07-04 Revised:2023-09-13 Accepted:2023-10-12 Online:2023-10-16 Published:2023-11-03
  • Contact: Yixuan Zhou E-mail:yxzhou@nwu.edu.cn;xlxuphy@nwu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11974279, 12074311, 12004310, and 12261141662).

摘要: Tin halide perovskites recently have attracted extensive research attention due to their similar electronic and band structures but non-toxicity compared with their lead analogues. In this work, we prepare high-quality CsSnX3 (X=Br, I) microplates with lateral sizes of around 1-4 μ m by chemical vapor deposition and investigate their low-temperature photoluminescence (PL) properties. A remarkable splitting of PL peaks of the CsSnBr3 microplate is observed at low temperatures. Besides the possible structural phase transition at below 70 K, the multi-peak fittings using Gauss functions and the power-dependent saturation phenomenon suggest that the PL could also be influenced by the conversion from the emission of bound excitons into free excitons. With the increase of temperature, the peak position shows a blueshift tendency for CsSnI3, which is governed by thermal expansion. However, the peak position of the CsSnBr3 microplate exhibits a transition from redshift to blueshift at ~ 160 K. The full width at half maximum of CsSnX3 broadens with increasing temperature, and the fitting results imply that longitudinal optical phonons dominate the electron-phonon coupling and the coupling strength is much more robust in CsSnBr3 than in CsSnI3. The PL intensity of CsSnX3 microplates is suppressed due to the enhanced non-radiative relaxation and exciton dissociation competing with radiative recombination. According to the Arrhenius law, the exciton binding energy of CsSnBr3 is ~ 38.4 meV, slightly smaller than that of CsSnI3.

关键词: cesium tin halide perovskite, temperature-dependent photoluminescence, chemical vapor deposition, microplate

Abstract: Tin halide perovskites recently have attracted extensive research attention due to their similar electronic and band structures but non-toxicity compared with their lead analogues. In this work, we prepare high-quality CsSnX3 (X=Br, I) microplates with lateral sizes of around 1-4 μ m by chemical vapor deposition and investigate their low-temperature photoluminescence (PL) properties. A remarkable splitting of PL peaks of the CsSnBr3 microplate is observed at low temperatures. Besides the possible structural phase transition at below 70 K, the multi-peak fittings using Gauss functions and the power-dependent saturation phenomenon suggest that the PL could also be influenced by the conversion from the emission of bound excitons into free excitons. With the increase of temperature, the peak position shows a blueshift tendency for CsSnI3, which is governed by thermal expansion. However, the peak position of the CsSnBr3 microplate exhibits a transition from redshift to blueshift at ~ 160 K. The full width at half maximum of CsSnX3 broadens with increasing temperature, and the fitting results imply that longitudinal optical phonons dominate the electron-phonon coupling and the coupling strength is much more robust in CsSnBr3 than in CsSnI3. The PL intensity of CsSnX3 microplates is suppressed due to the enhanced non-radiative relaxation and exciton dissociation competing with radiative recombination. According to the Arrhenius law, the exciton binding energy of CsSnBr3 is ~ 38.4 meV, slightly smaller than that of CsSnI3.

Key words: cesium tin halide perovskite, temperature-dependent photoluminescence, chemical vapor deposition, microplate

中图分类号:  (Optical properties of bulk materials and thin films)

  • 78.20.-e
78.55.-m (Photoluminescence, properties and materials)