journal article·2020-06-09

Unveiling the Two-Step Formation Pathway of Cs4PbBr6 Nanocrystals

Juan Hui, Yingnan Jiang, Ömür Ö Gökçinar, Junbin Tang, Qiyu Yu, Meng Zhang, Kui Yu

Chemistry of Materials· Volume 32· Issue 11
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Abstract

All-inorganic cesium lead halide perovskites have received much attention, but the study of the formation pathway is relatively little. We report here a new one-step approach for the synthesis of Cs4PbBr6 nanocrystals (NCs), as well as the exploration of its formation process. Mixing three independent precursors of Cs, Pb, and Br in a cuvette, we monitor the evolution of Cs4PbBr6 NCs by in situ absorption spectroscopy, the formation of which features a sharp absorption peak at 313 nm. Based on this model, we further divide the synthesis process into two stages, in which the two precursors react for a certain period before adding the third precursor to the reaction. We find that the absorption peak exhibits a dramatic change from 358 to 313 nm with the addition of Cs precursor to the reaction mixture of Pb and Br precursors. Accordingly, we propose that there might be a two-step formation pathway for Cs4PbBr6 NCs. The formation of the Pb–Br bond is the first step, and then, a new reaction takes place after the Cs precursor is involved, which eventually results in the formation of Cs4PbBr6 NCs. The present study provides a new approach to synthesize the Cs4PbBr6 NCs and understand their formation pathway.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Optical properties and cooling technologies in crystalline materials · Solid-state spectroscopy and crystallography

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, Sichuan 610065, P. R. China

Jilin Ginseng Academy, Changchun University of Chinese Medicine, Changchun, Jilin 130117, P. R. China

Key Laboratory of Material Corrosion and Protection of Sichuan Province, College of Materials Science and Engineering, Sichuan University of Science and Engineering,Zigong, Sichuan 643000, P. R. China

Engineering Research Center in Biomaterials, Sichuan University, Chengdu, Sichuan 610065, P. R. China

State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan 610065, P. R. China

Funding

Ministry of Education of the People's Republic of China · Department of Science and Technology of Jilin Province · National Natural Science Foundation of China · Key State Laboratory for Supramolecular Structures and Materials, Jilin University · State Key Laboratory of Polymer Materials Engineering, Sichuan University

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