通过二次谐波产生CsPbBr3单晶的偏振分辨表面和体态

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-10-06 DOI:10.1063/5.0291184

Shixiong Zhang, Weizhi Yu, Junkang Wu, Yingming Song, Ruiming Li, Hongri Liu, Meifeng Liu, Weikun Ge, Ning Tang

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引用次数: 0

摘要

卤化物钙钛矿单晶由于其优异的电子和光学性能，已成为开发高效光电器件的潜在候选者。位于单晶表面或内部的缺陷状态在决定器件性能方面起着至关重要的作用。本文采用偏振分辨二次谐波（SHG）测量方法研究了CsPbBr3单晶的表面态和体态。SHG强度的单向各向异性表明，表面以多晶Cs4PbBr6和CsPb2Br5相为主，表现出Cs对称性。此外，双光子吸收诱导的非偏振强发光表现出双重对称性。根据体内Br空位的能级位置确定其为辐射复合中心。这些实验结果不仅建立了一种区分表面态和体态的方法，而且有助于更深入地了解CsPbBr3单晶中缺陷态的光学性质。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Polarization-resolved surface and bulk states in CsPbBr3 single crystals via second harmonic generation

Due to their superior electronic and optical properties, halide perovskite single crystals have been potential candidates for developing high-efficiency optoelectronic devices. Defect states located on the surface or within the bulk of single crystals play a crucial role in determining the performance of devices. In this work, the surface and bulk states in CsPbBr3 single crystals were investigated by polarization-resolved second harmonic generation (SHG) measurements. Onefold anisotropy of SHG intensity indicates that the polycrystalline Cs4PbBr6 and CsPb2Br5 phases dominate the surface, which exhibits Cs symmetry. Moreover, an unpolarized and strong luminescence was observed induced by two-photon absorption, which displays a twofold symmetry. Br vacancies within the bulk were identified as the radiative recombination centers according to their energy level position. These experimental results not only establish a method for distinguishing between surface and bulk states but also facilitate a deeper understanding of the optical properties of defect states in CsPbBr3 single crystals.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.