Controlling structure and interfacial interaction of monolayer TaSe2 on bilayer graphene

Lee, Hyobeom; Im, Hayoon; Choi, Byoung Ki; Park, Kyoungree; Chen, Yi; Ruan, Wei; Zhong, Yong; Lee, Ji-Eun; Ryu, Hyejin; Crommie, Michael F.; Shen, Zhi-Xun; Hwang, Choongyu; Mo, Sung-Kwan; Hwang, Jinwoong

doi:10.1186/s40580-024-00422-9

Title: Controlling structure and interfacial interaction of monolayer TaSe2 on bilayer graphene

Journal Article · 15 April 2024 · Nano Convergence

DOI: https://doi.org/10.1186/s40580-024-00422-9 · OSTI ID:2337538

Lee, Hyobeom; Im, Hayoon; Choi, Byoung Ki; Park, Kyoungree; Chen, Yi; Ruan, Wei; Zhong, Yong; Lee, Ji-Eun; Ryu, Hyejin; Crommie, Michael F.; Shen, Zhi-Xun;

; Mo, Sung-Kwan; Hwang, Jinwoong

Abstract Tunability of interfacial effects between two-dimensional (2D) crystals is crucial not only for understanding the intrinsic properties of each system, but also for designing electronic devices based on ultra-thin heterostructures. A prerequisite of such heterostructure engineering is the availability of 2D crystals with different degrees of interfacial interactions. In this work, we report a controlled epitaxial growth of monolayer TaSe ₂ with different structural phases, 1 H and 1 T , on a bilayer graphene (BLG) substrate using molecular beam epitaxy, and its impact on the electronic properties of the heterostructures using angle-resolved photoemission spectroscopy. 1 H -TaSe ₂ exhibits significant charge transfer and band hybridization at the interface, whereas 1 T -TaSe ₂ shows weak interactions with the substrate. The distinct interfacial interactions are attributed to the dual effects from the differences of the work functions as well as the relative interlayer distance between TaSe ₂ films and BLG substrate. The method demonstrated here provides a viable route towards interface engineering in a variety of transition-metal dichalcogenides that can be applied to future nano-devices with designed electronic properties.

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Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2337538

Journal Information:: Nano Convergence, Journal Name: Nano Convergence Journal Issue: 1 Vol. 11; ISSN 2196-5404

Publisher:: Springer Science + Business MediaCopyright Statement

Country of Publication:: Germany

Language:: English

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