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Published on: October 1, 2019
Stable Bismuth-Doped Lead Halide Perovskite Core-Shell Nanocrystals by Surface Segregation Effect
Jingrun Zhu1, Lihui Zhou2, Yihua Zhu1
1Key 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.
Stable bismuth-doped lead halide perovskite nanocrystals (NCs) with a core-shell structure were developed. This strategy enhances NC stability and photocatalytic efficiency, paving the way for robust perovskite devices.
Area of Science:
- Materials Science
- Nanotechnology
- Photocatalysis
Background:
- Lead halide perovskite nanocrystals (NCs) offer excellent optoelectronic properties but suffer from poor stability, hindering their widespread application.
- Developing stable NCs is crucial for advancing perovskite-based technologies.
Purpose of the Study:
- To engineer stable core-shell structured bismuth-doped lead halide perovskite NCs.
- To investigate the structural and electronic properties of these novel NCs.
- To evaluate their performance in photocatalytic applications.
Main Methods:
- Synthesis of bismuth-doped lead halide perovskite NCs with a core-shell architecture via heterovalent substitutions and surface segregation.
- Advanced characterization techniques (e.g., TEM, XRD) to confirm core-shell structure.
- Ultrafast transient absorption spectroscopy to study carrier dynamics.
- Photocatalytic efficiency testing under cyclic conditions with moisture and light irradiation.
Main Results:
- Successfully fabricated stable core-shell perovskite NCs.
- Confirmed the core-shell structure and observed carrier transfer between core and shell.
- Demonstrated outstanding structural stability, retaining 97% of initial photocatalytic efficiency after cycling under harsh conditions.
- Established that the core-shell structure creates gradient energy levels.
Conclusions:
- The developed core-shell structure effectively enhances the stability of lead halide perovskite NCs.
- Bismuth doping and heterovalent substitution are key to achieving this stability.
- These stable NCs show significant potential for durable and efficient photocatalytic applications.
- The findings pave the way for developing more robust lead halide perovskite devices.
