Department of Materials and Interfaces and ‡Chemical Research Support, Weizmann Institute of Science , Rehovot, 76100, Israel.
Nano Lett. 2018 Jan 10;18(1):424-433. doi: 10.1021/acs.nanolett.7b04310. Epub 2017 Dec 12.
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 CsPbBr 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 CsPbBr-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.
全无机卤化铅钙钛矿纳米线由于与它们的杂化有机-无机对应物相比具有更好的稳定性，同时保留了其有趣的光学和光电性质，因此引起了越来越多的关注。具有受控取向和形态的表面引导纳米线阵列有望成为各种应用和系统研究的构建块。我们报告了 CsPbBr 纳米线在平坦和多面蓝宝石表面上的水平和对齐生长，以分别沿蓝宝石衬底的特定方向形成具有 6 重和 2 重对称性的阵列。我们观察到了导波行为和直径相关的光致发光发射，其范围远远超出了量子限制范围。这些阵列很容易集成到多个设备中，显示出 p 型行为和光电导性。基于这些纳米线的光电探测器具有迄今为止报道的任何基于 CsPbBr 的光电探测器最快的上升和下降时间。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性质和潜在应用的有前途的平台。
