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

Soo Ho Choi, Hyung Jin Kim, Bumsub Song, Yong In Kim, Gyeongtak Han, Huong Thi Thanh Nguyen, Hayoung Ko, Stephen Boandoh, Ji Hoon Choi, Chang Seok Oh, Hyun Je Cho, Jeong Won Jin, Yo Seob Won, Byung Hoon Lee, Seok Joon Yun, Bong Gyu Shin, Hu Young Jeong, Young Min Kim, Young Kyu Han, Young Hee LeeSoo Min Kim, Ki Kang Kim

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

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.

Original languageEnglish
Article number2006601
JournalAdvanced Materials
Volume33
Issue number15
DOIs
StatePublished - 15 Apr 2021

Keywords

  • atomic-sawtooth surface
  • chemical vapor deposition
  • epitaxial growth
  • single-crystal
  • transition metal dichalcogenides

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