Large lattice distortions and size-dependent bandgap modulation in epitaxial halide perovskite nanowires.,Nature Communications

当前位置： X-MOL 学术 › Nat. Commun. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Large lattice distortions and size-dependent bandgap modulation in epitaxial halide perovskite nanowires.
Nature Communications ( IF 14.7 ) Pub Date : 2020-01-24 , DOI: 10.1038/s41467-020-14365-2
Eitan Oksenberg ₁ , Aboma Merdasa ₂ , Lothar Houben ₃ , Ifat Kaplan-Ashiri ₃ , Amnon Rothman ₁ , Ivan G Scheblykin ₄ , Eva L Unger _{2,

4} , Ernesto Joselevich ₁

Affiliation

Metal-halide perovskites have been shown to be remarkable and promising optoelectronic materials. However, despite ongoing research from multiple perspectives, some fundamental questions regarding their optoelectronic properties remain controversial. One reason is the high-variance of data collected from, often unstable, polycrystalline thin films. Here we use ordered arrays of stable, single-crystal cesium lead bromide (CsPbBr3) nanowires grown by surface-guided chemical vapor deposition to study fundamental properties of these semiconductors in a one-dimensional model system. Specifically, we uncover the origin of an unusually large size-dependent luminescence emission spectral blue-shift. Using multiple spatially resolved spectroscopy techniques, we establish that bandgap modulation causes the emission shift, and by correlation with state-of-the-art electron microscopy methods, we reveal its origin in substantial and uniform lattice rotations due to heteroepitaxial strain and lattice relaxation. Understanding strain and its effect on the optoelectronic properties of these dynamic materials, from the atomic scale up, is essential to evaluate their performance limits and fundamentals of charge carrier dynamics.

中文翻译：

外延卤化物钙钛矿纳米线中的大晶格畸变和尺寸相关的带隙调制。

金属卤化物钙钛矿已被证明是杰出且有前途的光电材料。然而，尽管正在进行多方面的研究，但有关其光电特性的一些基本问题仍存在争议。原因之一是从通常不稳定的多晶薄膜收集的数据差异很大。在这里，我们使用通过表面引导化学气相沉积法生长的稳定的单晶溴化铯铯（CsPbBr3）纳米线的有序阵列来研究这些半导体在一维模型系统中的基本特性。具体来说，我们揭示了异常大的尺寸依赖性发光发射光谱蓝移的起源。使用多种空间分辨光谱技术，我们确定带隙调制会导致发射位移，并通过与最新的电子显微镜方法相关联，我们揭示了其由于异质外延应变和晶格弛豫而产生的基本均匀的晶格旋转。从原子尺度上了解应变及其对这些动态材料的光电性能的影响，对于评估其性能极限和电荷载流子动力学的基本原理至关重要。

更新日期：2020-01-24

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11