Regulation of the luminescence mechanism of two-dimensional tin halide perovskites

Tianju Zhang, Chaocheng Zhou, Xuezhen Feng, Ningning Dong, Hong Chen, Xianfeng Chen, Long Zhang, Jia Lin () and Jun Wang ()
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Tianju Zhang: Chinese Academy of Sciences
Chaocheng Zhou: Shanghai University of Electric Power
Xuezhen Feng: Southern University of Science and Technology
Ningning Dong: Chinese Academy of Sciences
Hong Chen: Southern University of Science and Technology
Xianfeng Chen: Shanghai Jiao Tong University
Long Zhang: University of Chinese Academy of Sciences
Jia Lin: Shanghai University of Electric Power
Jun Wang: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract Two-dimensional (2D) Sn-based perovskites are a kind of non-toxic environment-friendly luminescent material. However, the research on the luminescence mechanism of this type of perovskite is still very controversial, which greatly limits the further improvement and application of the luminescence performance. At present, the focus of controversy is defects and phonon scattering rates. In this work, we combine the organic cation control engineering with temperature-dependent transient absorption spectroscopy to systematically study the interband exciton relaxation pathways in layered A2SnI4 (A = PEA+, BA+, HA+, and OA+) structures. It is revealed that exciton-phonon scattering and exciton-defect scattering have different effects on exciton relaxation. Our study further confirms that the deformation potential scattering by charged defects, not by the non-polar optical phonons, dominates the excitons interband relaxation, which is largely different from the Pb-based perovskites. These results enhance the understanding of the origin of the non-radiative pathway in Sn-based perovskite materials.

Date: 2022
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DOI: 10.1038/s41467-021-27663-0

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