Cyanamide Passivation Enables Robust Elemental Imaging of Metal Halide Perovskites at Atomic ResolutionClick to copy article linkArticle link copied!
- Jiakai LiuJiakai LiuKAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi ArabiaCollege of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, ChinaMore by Jiakai Liu
- Kepeng SongKepeng SongKAUST Advanced Membranes and Porous Materials Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi ArabiaSchool of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, ChinaSuzhou Research Institute, Shandong University, Suzhou 215123, ChinaMore by Kepeng Song
- Xiaopeng ZhengXiaopeng ZhengKAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi ArabiaMore by Xiaopeng Zheng
- Jun YinJun YinKAUST Advanced Membranes and Porous Materials Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi ArabiaMore by Jun Yin
- Ke Xin YaoKe Xin YaoCollege of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaMore by Ke Xin Yao
- Cailing ChenCailing ChenKAUST Advanced Membranes and Porous Materials Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi ArabiaMore by Cailing Chen
- Haoze YangHaoze YangKAUST Advanced Membranes and Porous Materials Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi ArabiaMore by Haoze Yang
- Mohamed Nejib HedhiliMohamed Nejib HedhiliImaging and Characterization Core Lab, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi ArabiaMore by Mohamed Nejib Hedhili
- Wang ZhangWang ZhangCollege of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, ChinaMore by Wang Zhang
- Peigang HanPeigang HanCollege of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, ChinaMore by Peigang Han
- Omar F. MohammedOmar F. MohammedKAUST Advanced Membranes and Porous Materials Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi ArabiaMore by Omar F. Mohammed
- Yu Han*Yu Han*Email: [email protected]KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi ArabiaKAUST Advanced Membranes and Porous Materials Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi ArabiaMore by Yu Han
- Osman M. Bakr*Osman M. Bakr*Email: [email protected]KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi ArabiaMore by Osman M. Bakr
Abstract

Lead halide perovskites (LHPs) have attracted a tremendous amount of attention because of their applications in solar cells, lighting, and optoelectronics. However, the atomistic principles underlying their decomposition processes remain in large part obscure, likely due to the lack of precise information about their local structures and composition along regions with dimensions on the angstrom scale, such as crystal interfaces. Aberration-corrected scanning transmission electron microscopy combined with X-ray energy dispersive spectroscopy (EDS) is an ideal tool, in principle, for probing such information. However, atomic-resolution EDS has not been achieved for LHPs because of their instability under electron-beam irradiation. We report the fabrication of CsPbBr3 nanoplates with high beam stability through an interface-assisted regrowth strategy using cyanamide. The ultrahigh stability of the nanoplates primarily stems from two contributions: defect-healing self-assembly/regrowth processes and surface modulation by strong electron-withdrawing cyanamide molecules. The ultrahigh stability of as-prepared CsPbBr3 nanoplates enabled atomic-resolution EDS elemental mapping, which revealed atomically and elementally resolved details of the LHP nanostructures at an unprecedented level. While improving the stability of LHPs is critical for device applications, this work illustrates how improving the beam stability of LHPs is essential for addressing fundamental questions on structure–property relations in LHPs.
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