Robust excitonic light emission in 2D tin halide perovskites by weak excited state polaronic effect

Hongzhi Zhou, Qingjie Feng, Cheng Sun, Yahui Li, Weijian Tao, Wei Tang, Linjun Li, Enzheng Shi, Guangjun Nan () and Haiming Zhu ()
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Hongzhi Zhou: Zhejiang University
Qingjie Feng: Zhejiang Normal University
Cheng Sun: Zhejiang University
Yahui Li: Westlake University
Weijian Tao: Zhejiang University
Wei Tang: College of Optical Science and Engineering
Linjun Li: College of Optical Science and Engineering
Enzheng Shi: Westlake University
Guangjun Nan: Zhejiang Normal University
Haiming Zhu: Zhejiang University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract 2D perovskites hold immense promise in optoelectronics due to their strongly bound electron-hole pairs (i.e., excitons). While exciton polaron from interplay between exciton and lattice has been established in 2D lead-based perovskites, the exciton nature and behavior in the emerging 2D tin-based perovskites remains unclear. By combining spin-resolved ultrafast spectroscopy and sophisticated theoretical calculations, we reveal 2D tin-based perovskites as genuine excitonic semiconductors with weak polaronic screening effect and persistent Coulomb interaction, thanks to weak exciton-phonon coupling. We determine an excited state exciton binding energy of ~0.18 eV in n = 2 tin iodide perovskites, nearly twice of that in lead counterpart, despite of same large value of ~0.2 eV from steady state measurement. This finding emphasizes the pivotal role of excited state polaronic effect in these materials. The robust excitons in 2D tin-based perovskites exhibit excitation power-insensitive, high-efficiency and color-purity emission, rendering them superior for light-emitting applications.

Date: 2024
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DOI: 10.1038/s41467-024-52952-9

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