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Crystals 2018, 8(1), 2; doi:10.3390/cryst8010002

Atomic Characterization of Byproduct Nanoparticles on Cesium Lead Halide Nanocrystals Using High-Resolution Scanning Transmission Electron Microscopy

National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
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Received: 23 November 2017 / Revised: 20 December 2017 / Accepted: 20 December 2017 / Published: 22 December 2017
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Abstract

Recent microstructural studies on lead halide perovskite nanocrystals have consistently reported the coexistence of byproduct nanoparticles (NPs). However, the nature of these NPs and their formation mechanism are still a matter of debate. Herein, we have investigated the structure and compositions of the NPs located on colloidal cesium lead bromide nanocrystals (CsPbBr3 NCs), mainly through aberration-corrected transmission electron microscopy and spectroscopy. Our results show that these NPs can be assigned to PbBr2 and CsPb2Br5. The new CsPb2Br5 species are formed by reacting CsPbBr3 NCs with the remaining PbBr2 during the drying process. In addition, observation of the metallic Pb NPs are ascribed to the electron damage effect on CsPbBr3 NCs during transmission electron microscopy imaging. View Full-Text
Keywords: lead halide perovskite materials; colloidal cesium lead halide nanocrystals; scanning transmission electron microscopy and spectroscopy lead halide perovskite materials; colloidal cesium lead halide nanocrystals; scanning transmission electron microscopy and spectroscopy
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Zhang, M.; Li, H.; Jing, Q.; Lu, Z.; Wang, P. Atomic Characterization of Byproduct Nanoparticles on Cesium Lead Halide Nanocrystals Using High-Resolution Scanning Transmission Electron Microscopy. Crystals 2018, 8, 2.

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