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" Ligand Mediated Transformation of Cesium Lead Bromide Perovskite Nanocrystals to Lead Depleted Cs4PbBr6 Nanocrystals. "
Liu, ZekeBekenstein, YehonadavYe, XingchenNguyen, Son CSwabeck, JosephZhang, DandanLee, Shuit-TongYang, PeidongMa, WanliAlivisatos, A Paul
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AL
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| Record Number
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901011
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LA9z08s421
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| Title & Author
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Ligand Mediated Transformation of Cesium Lead Bromide Perovskite Nanocrystals to Lead Depleted Cs4PbBr6 Nanocrystals. [Article]\ Liu, ZekeBekenstein, YehonadavYe, XingchenNguyen, Son CSwabeck, JosephZhang, DandanLee, Shuit-TongYang, PeidongMa, WanliAlivisatos, A Paul
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2017
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Lawrence Berkeley National Laboratory
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| Abstract
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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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