Surface-Guided CsPbBr3 Perovskite Nanowires on Flat and Faceted Sapphire with Size-Dependent Photoluminescence and Fast Photoconductive Response
Surface-Guided CsPbBr3 Perovskite Nanowires on Flat and Faceted Sapphire with Size-Dependent Photoluminescence and Fast Photoconductive Response
复制标题
DOI：
10.1021/acs.nanolett.7b04310
复制
发表时间：
2018-01-01
期刊：
影响因子：
10.8
通讯作者：
Joselevich, Ernesto
中科院分区：
文献类型：
--
作者：
Oksenberg, Eitan;Sanders, Ella;Joselevich, Ernesto
全无机卤化铅钙钛矿纳米线已经成为越来越多的关注的焦点，因为它们与它们的混合有机无机对应物相比表现出改善的稳定性，同时保留了它们有趣的光学和光电性质。具有可控取向和形态的表面引导纳米线阵列作为各种应用和系统研究的构建块是有前途的。我们报道了CsPbBr 3纳米线的水平和对齐生长具有均匀的晶体取向的平面和多面的蓝宝石表面上形成阵列与6重和2重对称性，分别沿沿着特定方向的蓝宝石衬底。我们观察到波导行为和直径依赖的光致发光发射远远超出量子限制制度。这些阵列可以轻松集成到多个器件中，显示p型行为和光电导性。基于这些纳米线的光电探测器表现出迄今为止报道的任何基于CsPbBr 3的光电探测器的最快的上升和衰减时间。卤化物钙钛矿纳米线的一维阵列是研究这些独特材料的有趣特性和潜在应用的一个有前途的平台。
All-inorganic lead halide perovskite nanowires have been the focus of increasing interest since they exhibit improved stability compared to their hybrid organic inorganic counterparts, while retaining their interesting optical and optoelectronic properties. Arrays of surface-guided nanowires with controlled orientations and morphology are promising as building blocks for various applications and for systematic research. We report the horizontal and aligned growth of CsPbBr3 nanowires with a uniform crystallographic orientation on flat and faceted sapphire surfaces to form arrays with 6-fold and 2-fold symmetries, respectively, along specific directions of the sapphire substrate. We observed waveguiding behavior and diameter-dependent photoluminescence emission well beyond the quantum confinement regime. The arrays were easily integrated into multiple devices, displaying p-type behavior and photoconductivity. Photodetectors based on those nanowires exhibit the fastest rise and decay times for any CsPbBr3-based photodetectors reported so far. One-dimensional arrays of halide perovskite nanowires are a promising platform for investigating the intriguing properties and potential applications of these unique materials.