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Exfoliated flakes of layered materials, such as hexagonal boron nitride (hBN) and graphite with a thickness of several tens of nanometers, are used to construct van der Waals heterostructures. A flake with a desirable thickness, size, and shape is often selected from many exfoliated flakes placed randomly on a substrate using an optical microscope. This study examined the visualization of thick hBN and graphite flakes on SiO2/Si substrates through calculations and experiments. In particular, the study analyzed areas with different atomic layer thicknesses in a flake. For visualization, the SiO2 thickness was optimized based on the calculation. As an experimental result, the area with different thicknesses in a hBN flake showed different brightness in the image obtained using an optical microscope with a narrow band-pass filter. The maximum contrast was 12% with respect to the difference of one atomic layer thickness. In addition, hBN and graphite flakes were observed by differential interference contrast (DIC) microscopy. In the observation, the area with different thicknesses exhibited different brightnesses and colors. Adjusting the DIC bias had a similar effect to selecting a wavelength using a narrow band-pass filter.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Hexagonal boron nitride, van der Waals heterostructures, optical microscope

刊行年月日: 2023-07-16

出版者: IOP Publishing

掲載誌:

• Nanotechnology (ISSN: 13616528) vol. 34 issue. 29 295701

研究助成金:

• Chubei Itoh Foundation
• Kansai Research Foundation
• Japan Society for the Promotion of Science 21H04655
• Hyogo Science and Technology Association
• Iketani Science and Technology Foundation

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1088/1361-6528/accf23

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更新時刻: 2025-02-15 12:30:44 +0900

MDRでの公開時刻: 2025-02-15 12:30:44 +0900