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Site-controlled interlayer coupling in WSe2/2D perovskite heterostructure

单层硒化钨/二维钙钛矿异质结层间耦合强度的定点 调控

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Abstract

Interlayer excitons (IXs) formed in transition metal dichalcogenides (TMDs)/two-dimensional (2D) perovskite heterostructures are emerging as new platforms in the research of excitons. Compared with IXs in TMD van der Waals heterostructures, IXs can be robustly formed in TMDs/2D perovskite heterostructures regardless of the twist angle and thermal annealing process. Efficient control of interlayer coupling is essential for realizing their functionalities and enhancing their performances. Nevertheless, the study on the control of interlayer coupling strength between TMD and 2D perovskites is elusive. Therefore, we realize the control of interlayer coupling between monolayer WSe2 and (iso-BA)2PbI4 with SiO2 pillars in situ. An abnormal 10-nm blue shift and 2.5 times photoluminescence intensity enhancement were observed for heterostructures on the pillar, which was contrary to the red shift observed in TMD heterobilayers. We attributed the abnormal blue shift to the enhanced interlayer coupling arising from the reduced gap between constituent layers. In addition, IXs became more dominant over intralayer excitons with enhanced coupling. The interlayer coupling could be further engineered by tuning the height (h) and diameter (d) of pillars. In particular, an additional triplet IX showed up for the pillar with an h/d ratio of 0.6 due to the symmetry breaking of monolayer WSe2. The symmetry breaking also induced an anisotropic response of IXs. Our study is beneficial for tuning and enhancing the performance of IX-based devices, exciton localization and quantum emitters.

摘要

与过渡金属硫化物中的层间激子相比, 过渡金属硫化物与二维 钙钛矿间的层间激子有更高的鲁棒性, 且其光学性质与层间旋转角和 是否退火无关. 因此, 过渡金属硫化物与二维钙钛矿间的层间激子正成 为一个新的研究激子的体系. 层间激子的有效控制是实现其功能和提 高其性能的关键, 然而, 目前缺少对过渡金属硫化物与二位钙钛矿间层 间激子有效控制的研究. 本文利用二氧化硅纳米柱实现了单层WSe2和 (iso-BA)2PbI4二维钙钛矿间层间激子的定点调控. 与过渡金属硫化物 层间激子在应力作用下红移的现象相反, 我们在过渡金属硫化物和二 维钙钛矿间的层间激子中观测到10 nm的蓝移以及2.5倍的信号增强. 我们推断该蓝移是由层间间距减小导致的层间耦合强度增大引起的. 该推断也由观测到的层间激子相对自由激子的比例随着耦合强度的增 大而增大的现象验证. 同时, 层间耦合还可以通过改变纳米柱的直径和 高度进行调控. 特别地, 由于对称性被破坏, 我们在直径/高度比为0.6的 纳米柱上观测到三线态层间激子, 且层间激子的各项异性证明其对称 性确实已被破坏. 总之, 本研究对调控基于层间激子的光电器件、激子 局域态和量子光源具有一定促进作用.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (2018YFA0704403), the National Natural Science Foundation of China (62005091 and 62074064), Hubei Provincial Natural Science Foundation (2020CFB194), and Huazhong University of Science and Technology (HUST) grant (2019kfyXJJS046).

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Authors and Affiliations

  1. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China

    Qinglin Wei  (魏青林), Xinglin Wen  (温兴林), Junchao Hu  (胡俊超), Yingying Chen  (陈瑛瑛), Zeyi Liu  (刘泽一), Tinghao Lin  (林庭浩) & Dehui Li  (李德慧)

  2. Wuhan National Laboratory for Optoelectronics, Optical Valley Laboratory, Huazhong University of Science and Technology, Wuhan, 430074, China

    Xinglin Wen  (温兴林) & Dehui Li  (李德慧)

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  1. Qinglin Wei  (魏青林)
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  2. Xinglin Wen  (温兴林)
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  3. Junchao Hu  (胡俊超)
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  4. Yingying Chen  (陈瑛瑛)
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  5. Zeyi Liu  (刘泽一)
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  6. Tinghao Lin  (林庭浩)
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  7. Dehui Li  (李德慧)
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Contributions

Wen X and Li D conceived the idea and supervised the project; Wei Q prepared the heterostructures and conducted the optical measurement; Hu J synthesized 2D perovskites; Chen Y, Liu Z, and Lin T helped in TMD transfer and EBL fabrication. All authors analyzed the data and commented on the manuscript.

Corresponding authors

Correspondence to Xinglin Wen  (温兴林) or Dehui Li  (李德慧).

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The authors declare that they have no conflict of interest.

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Supporting data are available in the online version of the paper.

Qinglin Wei received her BS degree from Huazhong University of Science and Technology (HUST) in 2019. She is currently pursuing her Master degree at the School of Optical and Electronic Information, HUST. Her research focuses on spectroscopy of transition metal dichalcogenides, two-dimensional perovskites and their heterostructures.

Xinglin Wen received his BS degree in physics from Wuhan University in 2011 and PhD degree from Nanyang Technological University in 2016. He was a post-doctor at Nanyang Technological University from 2016 to 2018. He is currently an associate professor at the School of Optical and Electronic Information, HUST. His research interests include two-dimensional materials, plasmonics and plasmon-exciton coupled system.

Dehui Li received his BS degree in physics from Xi’an Jiaotong University in 2006 and his MS degree from the Institute of Modern Physics, Chinese Academy of Sciences in 2009. He obtained his PhD degree from Nanyang Technological University in 2013. He was a post-doctor at the University of California, Los Angeles from 2013 to 2016. Currently, he is a professor at the School of Optical and Electronic Information, HUST. His research focuses on the synthesis and optoelectronic properties of functional semiconducting nanomaterials and heterostructures.

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Wei, Q., Wen, X., Hu, J. et al. Site-controlled interlayer coupling in WSe2/2D perovskite heterostructure. Sci. China Mater. 65, 1337–1344 (2022). https://doi.org/10.1007/s40843-021-1911-6

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  • DOI: https://doi.org/10.1007/s40843-021-1911-6

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