title: Ligand Mediated Transformation of Cesium Lead Bromide Perovskite Nanocrystals to Lead Depleted Cs4PbBr6Nanocrystals.
abstract: 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 CsPbBr3NCs 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 CsPbBr3NCs but also present a method to synthesize uniform colloidal Cs4PbBr6NCs, which may actually be a common product of perovskite NCs degradation.
authors.affiliation: Institute of Functional Nano & Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou, Jiangsu 215123, China.|Department of Chemistry, University of California Berkeley , Berkeley, California 94720, United States.|Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Zeke
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Department of Chemistry, University of California Berkeley , Berkeley, California 94720, United States.|Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Yehonadav
authors.identifier: 0000-0001-6230-5182
authors.initials: Y
authors.lastname: Bekenstein
authors.affiliation: Department of Chemistry, University of California Berkeley , Berkeley, California 94720, United States.
authors.forename: Xingchen
authors.initials: X
authors.lastname: Ye
authors.affiliation: Department of Chemistry, University of California Berkeley , Berkeley, California 94720, United States.
authors.forename: Son C
authors.identifier: 0000-0001-7713-4195
authors.initials: SC
authors.lastname: Nguyen
authors.affiliation: Department of Chemistry, University of California Berkeley , Berkeley, California 94720, United States.|Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Joseph
authors.identifier: 0000-0003-2235-2472
authors.initials: J
authors.lastname: Swabeck
authors.affiliation: Department of Chemistry, University of California Berkeley , Berkeley, California 94720, United States.|Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Dandan
authors.initials: D
authors.lastname: Zhang
authors.affiliation: Institute of Functional Nano & Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou, Jiangsu 215123, China.
authors.forename: Shuit-Tong
authors.identifier: 0000-0003-1238-9802
authors.initials: ST
authors.lastname: Lee
authors.affiliation: Department of Chemistry, University of California Berkeley , Berkeley, California 94720, United States.|Department of Materials Science and Engineering, University of California Berkeley , Berkeley, California 94720, United States.|Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.|Kavli Energy NanoScience Institute, University of California Berkeley and Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Peidong
authors.identifier: 0000-0003-4799-1684
authors.initials: P
authors.lastname: Yang
authors.affiliation: Institute of Functional Nano & Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou, Jiangsu 215123, China.
authors.forename: Wanli
authors.initials: W
authors.lastname: Ma
authors.affiliation: Department of Chemistry, University of California Berkeley , Berkeley, California 94720, United States.|Department of Materials Science and Engineering, University of California Berkeley , Berkeley, California 94720, United States.|Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.|Kavli Energy NanoScience Institute, University of California Berkeley and Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: A Paul
authors.identifier: 0000-0001-6895-9048
authors.initials: AP
authors.lastname: Alivisatos