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

作　　者：Guocan Jiang Onur Erdem Rene Hubner Maximilian Georgi Wei Wei Xuelin Fan Jin Wang Hilmi Volkan Demir Nikolai Gaponik 

机构地区：[1]Physical Chemistry,Technische Universitat Dresden,Zellescher Weg 19,01069 Dresden,Germany [2]Department of Physics,Department of Electrical and Electronics Engineering,and UN A M-Institute of Materials Science and Nanotechnology,Bilkent University,06800 Ankara,Turkey [3]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 [4]Helmholtz-Zentrum Dresden-Rossendorf,Institute of Ion Beam Physics and Materials Research,Bautzner Landstrasse 400,01328 Dresden,Germany [5]Key Laboratory of the Ministry of Education for Advanced Catalysis Materials,Zhejiang Normal University,Jinhua 321004,China

出　　处：《Nano Research》2021年第4期1078-1086,共9页纳米研究（英文版）

基　　金：G.J.acknow ledges the China Scholarship Council(No.201706740088).This work was partly supported by the bilateral IB-BMBF-TOBITAK Project ColMiBack(01DL20002)and DFG project EY 16/14-3.O.E.acknowledges TOBITAK for the financial support through BIDEB-2211 program.H.V.D.gratefully acknowledges support from TUBA.The use of the HZDR Ion Beam Center TEM facilities and the funding of TEM Talos by the German Federal Ministry of Education of Research(BMBF),Grant No.03SF0451,in the framework o f HEMCP are acknowledged.M.G.acknowledges the Swiss National Science Foundation(SNF)and the German Research Foundation(DFG EY 16/18-2)for financial support.W.W.received supports from Jiangsu Overseas Visiting Scholar Program for University Prom inent Young&Middle-aged Teachers and Presidents.X.F.acknowledges the China Scholarship Council(No.201606340161).J.W.received supports from the National Natural Science Foundation of China(No.21701143).We are very grateful to Prof.A lexander Eychmuller,Dr.Vladim ir Lesnyak and Dr.Alexey Shavel for the valuable discussions.We are grateful to Susanne Goldberg for TEM imaging,Franziska Eichler for the instruction to the PL decay measurements.We appreciate Linlin Wang and Dr.Juliane Simmchen for their help with DLS measurements.We thank Dr.Andre Wolf for his corrections to the draft.

摘　　要：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 highmolecular-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 toform 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 PbBr_(2)in the reaction mixture,which in turn caused the formation of CsPb_(2)Br_(5)-mPbBr_(2)and CsPbBr_(3)-Cs_(4)PbBr_(6)-nCsBr NPs.The presence of CsPbBr_(3)-Cs_(4)PbBr_(6)-nCsBr NPs was responsible for the high PL QY,as the Cs_(4)PbBr_(6)phase with a wide energy bandgap can passivate the surface defects of the CsPbBr_(3)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.

关 键 词：lead bromide perovskites MECHANOSYNTHESIS polymer ligands polymer micelles poly(ethyleneimine)-induced phase conversion 

分 类 号：O62[理学—有机化学]