Stable Bismuth-Doped Lead Halide Perovskite Core-Shell Nanocrystals by Surface Segregation Effect

Jingrun Zhu; Lihui Zhou; Yihua Zhu; Jianfei Huang; Lu Hou; Jianhua Shen; Sheng Dai; Chunzhong Li

doi:10.1002/smll.202104399

Stable Bismuth-Doped Lead Halide Perovskite Core-Shell Nanocrystals by Surface Segregation Effect

Small. 2022 Jan;18(3):e2104399. doi: 10.1002/smll.202104399. Epub 2021 Nov 27.

Authors

Jingrun Zhu¹, Lihui Zhou², Yihua Zhu¹, Jianfei Huang³, Lu Hou¹, Jianhua Shen¹, Sheng Dai², Chunzhong Li^{1

4}

Affiliations

¹ Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, Frontier Science Center for Materiobiology and Dynamic Chemistry, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China.
² Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China.
³ Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA.
⁴ School of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China.

PMID: 34837312
DOI: 10.1002/smll.202104399

Abstract

Lead halide perovskite nanocrystals (NCs) exhibit excellent optoelectronic performance, however, the broad application is limited by their poor stability. Herein, a strategy for stable core-shell structured bismuth-doped lead halide perovskite NCs is reported. The stable core-shell perovskite NCs are prepared based on heterovalent substitutions and surface segregation effect. Core-shell features are revealed through advanced characterization and structure analyses. Meanwhile, the transfer of carriers between the core and the shell is observed by ultrafast transient absorption spectroscopy. The core-shell structured perovskite NCs exhibit outstanding structure stability and retain 97% of the original photocatalytic efficiency after cycle experiments under moisture ambient and light irradiation. Such a core-shell structure constructs gradient energy levels. These findings are expected to facilitate the development of stable lead halide perovskite devices.

Keywords: core-shell structure; nanocrystals; perovskites; stability.

Abstract

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