Aqueous Phase Exfoliating Quasi-2D CsPbBr3 Nanosheets with Ultrahigh Intrinsic Water Stability

Meilin Xie; Huan Liu; Fengjun Chun; Wen Deng; Chao Luo; Zhihao Zhu; Min Yang; Yongmei Li; Wen Li; Wei Yan; Weiqing Yang

doi:10.1002/smll.201901994

Aqueous Phase Exfoliating Quasi-2D CsPbBr₃ Nanosheets with Ultrahigh Intrinsic Water Stability

Small. 2019 Aug;15(34):e1901994. doi: 10.1002/smll.201901994. Epub 2019 Jun 28.

Authors

Meilin Xie¹, Huan Liu², Fengjun Chun¹, Wen Deng¹, Chao Luo¹, Zhihao Zhu¹, Min Yang³, Yongmei Li¹, Wen Li¹, Wei Yan⁴, Weiqing Yang¹

Affiliations

¹ Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China.
² State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
³ College of Chemistry and Life Science, Institute of Functional Molecules, Chengdu Normal University, Chengdu, 611130, China.
⁴ State Key Laboratory of Optical Technologies for Microfabrication, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, 610209, China.

PMID: 31250545
DOI: 10.1002/smll.201901994

Abstract

All-inorganic cesium lead halide perovskite nanocrystals (NCs) have emerged as attractive optoelectronic materials due to the excellent optical and electronic properties. However, their environmental stability, especially in the presence of water, is still a significant challenge for their further commercialization. Here, ultrahigh intrinsically water-stable all-inorganic quasi-2D CsPbBr₃ nanosheets (NSs) via aqueous phase exfoliation method are reported. Compared to conventional perovskite NCs, these unique quasi-2D CsPbBr₃ nanosheets present an outstanding long-term water stability with 87% photoluminescence (PL) intensity remaining after 168 h under water conditions. Moreover, the photoluminescence quantum yields (PLQY) of quasi-2D CsPbBr₃ NSs is up to 82.3%, and these quasi-2D CsPbBr₃ NSs also present good photostability of keeping 85% PL intensity after 2 h under 365 nm UV light. Evidently, such quasi-2D perovskite NSs will open up a new way to investigate the intrinsic stability of all-inorganic perovskites and further promote the commercial development of perovskite-based optoelectronic and photovoltaic devices.

Keywords: CsPbBr3; all-inorganic perovskites; aqueous phase exfoliation; intrinsic water stability; quasi-2D.

Abstract

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