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Quantum confinement effect of two-dimensional all-inorganic halide perovskites

全无机卤素钙钛矿中的量子限制效应

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Abstract

Quantum confinement effect (QCE), an essential physical phenomenon of semiconductors when the size becomes comparable to the exciton Bohr radius, typically results in quite different physical properties of low-dimensional materials from their bulk counterparts and can be exploited to enhance the device performance in various optoelectronic applications. Here, taking CsPbBr3 as an example, we reported QCE in all-inorganic halide perovskite in two-dimensional (2D) nanoplates. Blue shifts in optical absorption and photoluminescence spectra were found to be stronger in thinner nanoplates than that in thicker nanoplates, whose thickness lowered below ∼7 nm. The exciton binding energy results showed similar trend as that obtained for the optical absorption and photoluminescence. Meanwile, the function of integrated intensity and full width at half maximum and temperature also showed similar results, further supporting our conclusions. The results displayed the QCE in all-inorganic halide perovskite nanoplates and helped to design the all-inorganic halide perovskites with desired optical properties.

摘要

摘要当半导体材料尺寸缩小到与激子尺寸相当的时候, 量子限制效应会在对应的低维材料中诱导出不同的物理行为. 本文以CsPbBr3为例, 报道了在全无机钙钛矿纳米片中的量子限制效应. 根据DFT理论模拟可知, 当CsPbBr3材料减薄至7纳米左右时, 该效应导致该材料的光吸收和光致发光光谱的峰位蓝移, 且样品越薄, 峰位蓝移现象越明显. 该效应也会导致激子束缚能随着材料厚度的减薄而显著增大. 同时, 变温光致发光光谱的光强-温度与半高宽-温度函数都显示出厚度越薄量子限制效应越强的趋势. 本文揭示了二维全无机卤化物钙钛矿的量子限制效应, 可为设计全无机卤化物钙钛矿光电器件提供参考依据.

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Acknowledgements

This work was supported by the National Basic Research Program of China (2014CB931702), the National Key Research and Development Program of China (2016YFB0401701), the National Natural Science Foundation of China (NSFC 51572128 and 21403109), NSFC-RGC (5151101197), the Natural Science Foundation of Jiangsu Province (BK20160827), China Postdoctoral Science Foundation (2016M590455), the Fundamental Research Funds for the Central Universities (30915012205 and 30916015106), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China

    Bo Cai  (蔡波), Xiaoming Li  (李晓明), Yu Gu  (顾宇), Jianhai Li  (李建海), Meiqiu Xie  (谢美秋), Fei Cao  (曹菲), Jizhong Song  (宋继中), Shengli Zhang  (张胜利) & Haibo Zeng  (曾海波)

  2. King Abdullah University of Science and Technology (KAUST), KAUST Catalysis Center (KCC), Physical Sciences and Engineering Division (PSE), Thuwal, 23955-6900, Saudi Arabia

    Moussab Harb & Luigi Cavallo

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  1. Bo Cai  (蔡波)
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  11. Haibo Zeng  (曾海波)
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Correspondence to Haibo Zeng  (曾海波).

Additional information

Bo Cai received his bachelor degree in materials science and engineer from Nanjing University of Science and Technology in 2013. Now, he is a PhD candidate in Prof. Zeng’s group. His current research interest is perovskite DFT simulations.

Xiaoming Li received his PhD degree in material science from Nanjing University of Aeronautics and Astronautics in 2017. Now, he is a research member in Prof. Zeng’s group. His current research interests include all-inorganic halide perovskites and their optoelectronic applications.

Yu Gu received his PhD degree from Clemson University, USA in 2014. Now, he is an associate professor in Prof. Zeng’s group. His current research interest is optoelectronic device simulation.

Haibo Zeng received his PhD degree from the Institute of Solid States Physics, Chinese Academy of Sciences in 2006. Now he is the leader of MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials. His current research interests are low-dimensional semiconductor optoelectronics including 2D materials (simulations and experiments) and QDs (synthesis, optics, photodetectors and LEDs).

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Cai, B., Li, X., Gu, Y. et al. Quantum confinement effect of two-dimensional all-inorganic halide perovskites. Sci. China Mater. 60, 811–818 (2017). https://doi.org/10.1007/s40843-017-9090-0

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