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

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buir.contributor.authorErdem, Onur
buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage1086en_US
dc.citation.spage1078en_US
dc.citation.volumeNumber14en_US
dc.contributor.authorJiang, G.
dc.contributor.authorErdem, Onur
dc.contributor.authorHübner, R.
dc.contributor.authorGeorgi, M.
dc.contributor.authorWei, W.
dc.contributor.authorFan, X.
dc.contributor.authorWang, J.
dc.contributor.authorDemir, Hilmi Volkan
dc.date.accessioned2022-02-16T11:07:28Z
dc.date.available2022-02-16T11:07:28Z
dc.date.issued2021-04
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentDepartment of Physicsen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractThe 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.en_US
dc.description.provenanceSubmitted by Dilan Ayverdi (dilan.ayverdi@bilkent.edu.tr) on 2022-02-16T11:07:28Z No. of bitstreams: 1 Mechanosynthesis_of_polymer-stabilized_lead_bromide_perovskites_insight_into_the_formation_and_phase_conversion_of_nanoparticles.pdf: 4541712 bytes, checksum: 68084f538d7ec7e3ecb74305129db256 (MD5)en
dc.description.provenanceMade available in DSpace on 2022-02-16T11:07:28Z (GMT). No. of bitstreams: 1 Mechanosynthesis_of_polymer-stabilized_lead_bromide_perovskites_insight_into_the_formation_and_phase_conversion_of_nanoparticles.pdf: 4541712 bytes, checksum: 68084f538d7ec7e3ecb74305129db256 (MD5) Previous issue date: 2021-04en
dc.identifier.doi10.1007/s12274-020-3152-7en_US
dc.identifier.issn1998-0124
dc.identifier.urihttp://hdl.handle.net/11693/77420
dc.language.isoEnglishen_US
dc.publisherTsinghua University Pressen_US
dc.relation.isversionofhttps://doi.org/10.1007/s12274-020-3152-7en_US
dc.source.titleNano Researchen_US
dc.subjectLead bromide perovskitesen_US
dc.subjectMechanosynthesisen_US
dc.subjectPolymer ligandsen_US
dc.subjectPolymer micellesen_US
dc.subjectPoly(ethyleneimine)-induced phase conversionen_US
dc.titleMechanosynthesis of polymer-stabilized lead bromide perovskites: insight into the formation and phase conversion of nanoparticlesen_US
dc.typeArticleen_US

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