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. 2020 Aug 27;13(3):225–234. doi: 10.1007/s12200-020-1051-x

Self-trapped excitons in two-dimensional perovskites

Junze Li 1, Haizhen Wang 1,✉, Dehui Li 1,2,✉
PMCID: PMC9743880  PMID: 36641579

Abstract

With strong electron-phonon coupling, the self-trapped excitons are usually formed in materials, which leads to the local lattice distortion and localized excitons. The self-trapping strongly depends on the dimensionality of the materials. In the three-dimensional case, there is a potential barrier for self-trapping, whereas no such barrier is present for quasi-one-dimensional systems. Two-dimensional (2D) systems are marginal cases with a much lower potential barrier or nonexistent potential barrier for the self-trapping, leading to the easier formation of self-trapped states. Self-trapped excitons emission exhibits a broadband emission with a large Stokes shift below the bandgap. 2D perovskites are a class of layered structure material with unique optical properties and would find potential promising optoelectronic. In particular, self-trapped excitons are present in 2D perovskites and can significantly influence the optical and electrical properties of 2D perovskites due to the soft characteristic and strong electron-phonon interaction. Here, we summarized the luminescence characteristics, origins, and characterizations of self-trapped excitons in 2D perovskites and finally gave an introduction to their applications in optoelectronics.

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Keywords: self-trapped exciton (STE), two-dimensional (2D) perovskites, broadband emission, electron-phonon coupling, optoelectronic applications

Acknowledgements

D. L. acknowledges the support from the National Basic Research Program of China (No. 2018YFA0704403), the National Natural Science Foundation of China (NSFC) (Grant No. 61674060), and Innovation Fund of Wuhan National Laboratory for Optoelectronics (WNLO).

Footnotes

Junze Li obtained his Ph.D. degree in Physical Electronics from Huazhong University of Science and Technology, China in June 2020. In July 2020, he joined School of Optical and Electronic Information, Huazhong University of Science and Technology, China as a postdoctoral. His current research interests focus on optoelectronic devices based on 2D perovskite.

Haizhen Wang is a scientist in School of Optical and Electronic Information at Huazhong University of Science and Technology in China. She received her Ph.D. degree from New Mexico State University, USA. Her research interest mainly focuses on the design of transition metal-based bifunctional electrocatalysts and anode materials for lithium ion batteries as well as two-dimensional halide perovskites.

Dehui Li is a professor in School of Optical and Electronic Information at Huazhong University of Science and Technology in China. He obtained his Ph.D. degree from Nanyang Technological University, Singapore in 2013 and was a postdoctoral fellow with Prof. Xiangfeng Duan (2013–2016) at University of California, Los Angeles, USA. His current research interests include low-dimensional halide perovskites, two-dimensional layered materials and surface plasmons in optoelectronics.

Contributor Information

Haizhen Wang, Email: wanghz@hust.edu.cn.

Dehui Li, Email: dehuili@hust.edu.cn.

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