title: Atomically thin cesium lead bromide perovskite quantum wires with high luminescence.
abstract: We report a room-temperature colloidal synthesis of few-unit-cell-thick CsPbBr3QWs with lengths over a hundred nanometers. The surfactant-directed oriented attachment growth mechanism was proposed to explain the formation of such CsPbBr3QWs. Owing to the strong quantum confinement effect, the photoluminescence (PL) emission peak of few-unit-cell-thick CsPbBr3QWs blue-shifted to 430 nm. The ensemble PL quantum yield (PLQY) of the few-unit-cell-thick CsPbBr3QWs increased to 21.13% through a simple heat-treatment process. The improvement of PLQY was ascribed to the reduction of the density of surface trap states and defect states induced by the heat-treatment process. Notably, the dependence of the bandgap on the diameter with different numbers of unit cells was presented for the first time in 1-D CsPbBr3QWs on the basis of the produced few-unit-cell-thick CsPbBr3QWs.
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, Hefei Science Center, National Synchrotron Radiation Laboratory & Synergetic Innovation Center of Quantum Information and Quantum Physics, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China. zengj@ustc.edu.cn xpwang@ustc.edu.cn.
authors.forename: Hongwen
authors.initials: H
authors.lastname: Huang
authors.forename: Mei
authors.initials: M
authors.lastname: Liu
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.forename: Laihao
authors.initials: L
authors.lastname: Luo
authors.forename: Jiangtao
authors.initials: J
authors.lastname: Zhao
authors.forename: Zhenlin
authors.initials: Z
authors.lastname: Luo
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Wang
authors.forename: Zhizhen
authors.initials: Z
authors.lastname: Ye
authors.forename: Haiping
authors.initials: H
authors.lastname: He
authors.forename: Jie
authors.initials: J
authors.lastname: Zeng