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Research Article | Open Access

Mechanosynthesis of polymer-stabilized lead bromide perovskites: Insight into the formation and phase conversion of nanoparticles

Guocan Jiang1, Onur Erdem2, René Hübner4, Maximilian Georgi1, Wei Wei1, Xuelin Fan1, Jin Wang5, Hilmi Volkan Demir2,3, Nikolai Gaponik1( )
Physical Chemistry, Technische Universität Dresden, Zellescher Weg 19, 01069 Dresden, Germany
Department of Physics, Department of Electrical and Electronics Engineering, and UNAM − Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey
LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, School of Mathematical and Physical Sciences, School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore
Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstrasse 400, 01328 Dresden, Germany
Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua 321004, China
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Abstract

The application of polymers to replace oleylamine (OLA) and oleic acid (OA) as ligands for perovskite nanocrystals is an effective strategy to improve their stability and durability especially for the solution-based processing. Herein, we report a mechanosynthesis of lead bromide perovskite nanoparticles (NPs) stabilized by partially hydrolyzed poly(methyl methacrylate) (h-PMMA) and high- molecular-weight highly-branched poly(ethylenimine) (PEI-25K). The as-synthesized NP solutions exhibited green emission centered at 516 nm, possessing a narrow full-width at half-maximum of 17 nm and as high photoluminescence quantum yield (PL QY) as 85%, while showing excellent durability and resistance to polar solvents, e.g., methanol. The colloids of polymer-stabilized NPs were directly processable to form stable and strongly-emitting thin films and solids, making them attractive as gain media. Furthermore, the roles of h-PMMA and PEI-25K in the grinding process were studied in depth. The h-PMMA can form micelles in the grinding solvent of dichloromethane to act as size-regulating templates for the growth of NPs. The PEI-25K with large amounts of amino groups induced significant enrichment of PbBr2 in the reaction mixture, which in turn caused the formation of CsPb2Br5-mPbBr2 and CsPbBr3-Cs4PbBr6-nCsBr NPs. The presence of CsPbBr3-Cs4PbBr6-nCsBr NPs was responsible for the high PL QY, as the Cs4PbBr6 phase with a wide energy bandgap can passivate the surface defects of the CsPbBr3 phase. This work describes a direct and facile mechanosynthesis of polymer-coordinated perovskite NPs and promotes in-depth understanding of the formation and phase conversion for perovskite NPs in the grinding process.

Keywords

lead bromide perovskitesmechanosynthesispolymer ligandspolymer micellespoly(ethyleneimine)-induced phase conversion

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Nano Research
Volume 14 Issue 4,
April 2021
Pages 1078-1086
DOI: 10.1007/s12274-020-3152-7
Cite this article:
Jiang G, Erdem O, Hübner R, et al. Mechanosynthesis of polymer-stabilized lead bromide perovskites: Insight into the formation and phase conversion of nanoparticles. Nano Research, 2021, 14(4): 1078-1086. https://doi.org/10.1007/s12274-020-3152-7
Topics:
Bromine compoundsEsters Micelles NanoparticlesOrganic solventsPerovskitePolymer films SolsSurface defects

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Received: 05 July 2020
Revised: 30 September 2020
Accepted: 02 October 2020
Published: 02 November 2020
© The Author(s) 2020

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