WS2/Au and WS2/Ag structures fabricated by metal-assisted exfoliation: Thickness-dependent physical properties

Eunseo Cho; Dong-Wook Kim; Nahyun Kim; Anh T. Nguyen; Seoyoung Lim; Jungeun Song; Jungyoon Cho; Soyeong Kwon

doi:10.1117/12.2677969

5 October 2023 WS₂/Au and WS₂/Ag structures fabricated by metal-assisted exfoliation: Thickness-dependent physical properties

Eunseo Cho, Dong-Wook Kim, Nahyun Kim, Anh T. Nguyen, Seoyoung Lim, Jungeun Song, Jungyoon Cho, Soyeong Kwon

Author Affiliations +

Proceedings Volume PC12651, Low-Dimensional Materials and Devices 2023; PC126510W (2023) https://doi.org/10.1117/12.2677969
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Conference Poster

Abstract

WS2 flakes were prepared on template-stripped ultra-flat Au and Ag layers using a metal-assisted exfoliation technique, and their physical characteristics were investigated. The identification of the thickness for each flake is confirmed by the agreement between the measured and calculated optical reflectance spectra. Despite the extremely small flake thickness, the resonant cavity modes can appear in WS2/Au and WS2/Ag, according to the anticipated phase shifts of light. The contact potential difference of the flake was studied using Kelvin probe force microscopy to propose the interfacial band alignment. This work can provide valuable insights into the use of the 2D-semiconductor/metal structures for optoelectronic device applications.

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Eunseo Cho, Dong-Wook Kim, Nahyun Kim, Anh T. Nguyen, Seoyoung Lim, Jungeun Song, Jungyoon Cho, and Soyeong Kwon "WS₂/Au and WS₂/Ag structures fabricated by metal-assisted exfoliation: Thickness-dependent physical properties", Proc. SPIE PC12651, Low-Dimensional Materials and Devices 2023, PC126510W (5 October 2023); https://doi.org/10.1117/12.2677969

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