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Jeong, Hu Young
UNIST Central Research Facilities (UCRF)
Research Interests
  • Soft material characterization such as graphene using a low kV Cs-corrected TEM
  • Insitu-TEM characterization of carbon-based materials using nanofactory STM holder for Li-ion battery application
  • Structural characterization of mesoporous materials using SEM & TEM
  • Interface analysis between various oxides and metals through Cs-corrected (S)TEM
  • Resistive switching mechanism of graphene oxide thin films for RRAM application

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Epitaxial Single-Crystal Growth of Transition Metal Dichalcogenide Monolayers via the Atomic Sawtooth Au Surface

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Title
Epitaxial Single-Crystal Growth of Transition Metal Dichalcogenide Monolayers via the Atomic Sawtooth Au Surface
Author
Choi, Soo HoKim, Hyung-JinSong, BumsubKim, Yong InHan, GyeongtakNguyen, Huong Thi ThanhKo, HayoungBoandoh, StephenChoi, Ji HoonOh, Chang SeokCho, Hyun JeJin, Jeong WonWon, Yo SeobLee, Byung HoonYun, Seok JoonShin, Bong GyuJeong, Hu YoungKim, Young-MinHan, Young-KyuLee, Young HeeKim, Soo MinKim, Ki Kang
Issue Date
2021-03
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS
Abstract
Growth of 2D van der Waals layered single-crystal (SC) films is highly desired not only to manifest the intrinsic physical and chemical properties of materials, but also to enable the development of unprecedented devices for industrial applications. While wafer-scale SC hexagonal boron nitride film has been successfully grown, an ideal growth platform for diatomic transition metal dichalcogenide (TMdC) films has not been established to date. Here, the SC growth of TMdC monolayers on a centimeter scale via the atomic sawtooth gold surface as a universal growth template is reported. The atomic tooth-gullet surface is constructed by the one-step solidification of liquid gold, evidenced by transmission electron microscopy. The anisotropic adsorption energy of the TMdC cluster, confirmed by density-functional calculations, prevails at the periodic atomic-step edge to yield unidirectional epitaxial growth of triangular TMdC grains, eventually forming the SC film, regardless of the Miller indices. Growth using the atomic sawtooth gold surface as a universal growth template is demonstrated for several TMdC monolayer films, including WS2, WSe2, MoS2, the MoSe2/WSe2 heterostructure, and W1-xMoxS2 alloys. This strategy provides a general avenue for the SC growth of diatomic van der Waals heterostructures on a wafer scale, to further facilitate the applications of TMdCs in post-silicon technology.
URI
https://scholarworks.unist.ac.kr/handle/201301/52542
URL
https://onlinelibrary.wiley.com/doi/10.1002/adma.202006601
DOI
10.1002/adma.202006601
ISSN
0935-9648
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UCRF_Journal Papers
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