Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 139, Issue 15, Pages 5309-5312Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b01409
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Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division within Physical Chemistry of Inorganic Nanostructures Program [DE-AC02-05-CH11231, KC3103]
- National Key Research Projects [2016YFA0202402]
- National Natural Science Fund [61674111]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- National Postdoctoral Program for Innovative Talents [BX201600113]
- State-Sponsored Scholarship for Graduate Students from China Scholarship Council
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Lead halide perovskite nanocrystals (NCs) have emerged as attractive nanomaterials owing to their excellent optical and optoelectronic properties. Their intrinsic instability and soft nature enable a post-synthetic controlled chemical transformation. We studied a ligand mediated transformation of presynthesized CsPbBr3 NCs to a new type of lead halide depleted perovskite derivative nanocrystal, namely Cs4PbBr6. The transformation is initiated by amine addition, and the use of alkyl-thiol ligands greatly improves the size uniformity and chemical stability of the derived NCs. The thermodynamically driven transformation is governed by a two-step dissolution recrystallization mechanism, which is monitored optically. Our results not only shed light on a decomposition pathway of CsPbBr3 NCs but also present a method to synthesize uniform colloidal Cs4PbBr6 NCs, which may actually be a common product of perovskite NCs degradation.
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