Optical properties of CVD-grown multilayer graphene on nickel using spectroscopic ellipsometry

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2024-10-19 DOI:10.1016/j.optmat.2024.116300

Hervin Maulina , Eri Widianto , Emmistasega Subama , Muhammad Riswan , Cipto Driyo , Dwi Nugraheni Rositawati , Fahrudin Nugroho , Moh Edi Wibowo , Iman Santoso

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引用次数: 0

Abstract

Incorporating graphene into relevant technologies requires its integration with commercially suitable substrates. Understanding the interactions between graphene and these substrates is crucial, as graphene serves as an ideal model system for investigating electronic phenomena. In this work, we report the optical properties of multilayer graphene on nickel substrates using spectroscopic ellipsometry. We provide information on the spectral dependence of optical properties of multilayer graphene, such as the complex dielectric constant, refractive index, and optical conductivity in the energy range of 1.6–5.0 eV. The optical conductivity profile obtained from SE analysis showed a symmetrical peak at 4.38 eV, suggesting an interband transition from the

π

π^{*}

orbital at the M point. The graphene/Ni interaction generated changes in the number of available states below the Fermi level, leading to significant changes in electron density. Our result provides the information essential for understanding relevant research and developing graphene-based optoelectronic applications.

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利用光谱椭偏仪测量镍上 CVD 生长的多层石墨烯的光学特性

要将石墨烯应用到相关技术中，就必须将其与商业上适用的基底相结合。了解石墨烯与这些基底之间的相互作用至关重要，因为石墨烯是研究电子现象的理想模型系统。在这项工作中，我们利用光谱椭偏仪报告了镍基底上多层石墨烯的光学特性。我们提供了多层石墨烯光学特性的光谱依赖性信息，如复介电常数、折射率和 1.6-5.0 eV 能量范围内的光导率。通过 SE 分析获得的光导率曲线在 4.38 eV 处显示出一个对称峰，表明在 M 点存在从 π 到 π∗ 轨道的带间跃迁。石墨烯/镍的相互作用导致费米级以下可用态的数量发生变化，从而导致电子密度的显著变化。我们的研究结果为了解相关研究和开发基于石墨烯的光电应用提供了重要信息。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.