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<p>Transition metal dichalcogenides (TMDCs), such as molybdenum disulfide (MoS<sub>2</sub>), have attracted extensive attention in recent years because of their unique optical, chemical, optoelectronic and electrical properties. The property of MoS<sub>2</sub> is closely related to its thickness or the number of layers. It is important identify the number of MoS<sub>2</sub> layers before implementing practical applications. In this work, we discuss a nondestructive and powerful method of identifying the layer number of MoS<sub>2</sub> on the SiO<sub>2</sub>/Si substrates by the Raman integrated area ratios of the E<sup>1</sup><sub>2g</sub> and A<sub>1g</sub> modes to those of the SiO<sub>2</sub>/Si substrate. The related photoluminescence (PL) spectra and optical microscopy are also studied as a reference. This technique of measuring Raman intensity ratios from MoS<sub>2</sub> and the substrate can be expanded to determine the layer number of other ultrathin 2D flakes.</p>

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Layer Number Identification of MoS2 by the Raman Integrated Area Ratio of Its Vibration Modes to Substrate

  • 期刊论文

  • 发表日期：

    2025年5月15日

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  • Zusong Zhu,
  • Jiancun You,
  • Dequan Zhu

摘要

Transition metal dichalcogenides (TMDCs), such as molybdenum disulfide (MoS2), have attracted extensive attention in recent years because of their unique optical, chemical, optoelectronic and electrical properties. The property of MoS2 is closely related to its thickness or the number of layers. It is important identify the number of MoS2 layers before implementing practical applications. In this work, we discuss a nondestructive and powerful method of identifying the layer number of MoS2 on the SiO2/Si substrates by the Raman integrated area ratios of the E12g and A1g modes to those of the SiO2/Si substrate. The related photoluminescence (PL) spectra and optical microscopy are also studied as a reference. This technique of measuring Raman intensity ratios from MoS2 and the substrate can be expanded to determine the layer number of other ultrathin 2D flakes.