Atomically thin cesium lead bromide perovskite quantum wires with high luminescence.

Title Atomically thin cesium lead bromide perovskite quantum wires with high luminescence.
Authors H. Huang; M. Liu; J. Li; L. Luo; J. Zhao; Z. Luo; X. Wang; Z. Ye; H. He; J. Zeng
Journal Nanoscale
DOI 10.1039/c6nr08250e
Abstract

We report a room-temperature colloidal synthesis of few-unit-cell-thick CsPbBr3 QWs with lengths over a hundred nanometers. The surfactant-directed oriented attachment growth mechanism was proposed to explain the formation of such CsPbBr3 QWs. Owing to the strong quantum confinement effect, the photoluminescence (PL) emission peak of few-unit-cell-thick CsPbBr3 QWs blue-shifted to 430 nm. The ensemble PL quantum yield (PLQY) of the few-unit-cell-thick CsPbBr3 QWs 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 CsPbBr3 QWs on the basis of the produced few-unit-cell-thick CsPbBr3 QWs.

Citation H. Huang; M. Liu; J. Li; L. Luo; J. Zhao; Z. Luo; X. Wang; Z. Ye; H. He; J. Zeng.Atomically thin cesium lead bromide perovskite quantum wires with high luminescence.. Nanoscale. 2017;9(1):104108. doi:10.1039/c6nr08250e

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