Accurate Layer-Number Determination of Hexagonal Boron Nitride Using Optical Characterization

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2024-11-11 DOI:10.1021/acs.nanolett.4c04241

Tianyu Zhang, Shuang Qiao, Hongxia Xue, Zhongqi Wang, Chengdong Yao, Xiong Wang, Kai Feng, Lain-Jong Li, Dong-Keun Ki

引用次数: 0

Abstract

Precise determination of the layer number (N) of hexagonal boron nitride (hBN) is crucial for its integration with other layered materials in applications such as ferroelectric devices and moiré potential modulation. We present a nondestructive method to accurately identify N, combining optical contrast analysis with second harmonic generation (SHG) measurements. By studying the flakes on 90 nm thick SiO₂/Si substrates, we demonstrate that red-filtered optical images provide a clear contrast step in N with an uncertainty of ±1 layer, while SHG measurements further reduce the error by distinguishing even and odd layers. We also introduce a real-time detection technique to identify monolayer and few-layer hBN, improving flake identification efficiency. Given the growing interest in twisted hBN interfaces and their integration in van der Waals heterostructures, this method offers a practical approach for future studies.

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利用光学特性准确测定六方氮化硼的层数

精确测定六方氮化硼（hBN）的层数（N）对其与其他层状材料在铁电器件和摩尔电势调制等应用中的整合至关重要。我们提出了一种结合光学对比分析和二次谐波发生（SHG）测量的无损方法来准确识别 N。通过研究 90 nm 厚的二氧化硅/硅衬底上的薄片，我们证明了红色滤波光学图像提供了 N 的清晰对比阶跃，其不确定性为 ±1 层，而 SHG 测量通过区分偶数层和奇数层进一步降低了误差。我们还引入了一种实时检测技术来识别单层和少层氢化硼，从而提高了薄片识别效率。鉴于人们对扭曲的 hBN 界面及其在范德华异质结构中的整合越来越感兴趣，这种方法为未来的研究提供了一种实用的方法。

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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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.