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IBS CMSD Seminar_Prof. Ki Kang Kim(Sungkyunkwan University)(Mar. 22, 2023)

Writer : Center for Molecular Spectroscopy and Dynamics RegDate : 2023-03-14 Hit:1351

SPEAKER
Prof. Ki Kang Kim (Sungkyunkwan University)
TITLE
Toward single-crystal 2D van der Waals materials synthesis on water scale
ABSTRACT
Two-dimensional (2D) materials including graphene, hexagonal boron nitride, and transition metal dichalcogenide have been paid attentions due to unusual intrinsic physical and chemical properties such as high exciton binding energy and large magnetic resistance. Such unusual properties allow unprecedented applications. To realize the intrinsic material properties and industrial applications, wafer-scaled single-crystal 2D films are highly required. Here, we present the recent progress of single-crystal growth for 2D van der Waals materials in a wafer scale via the self-collimation on liquid substrate and the epitaxial growth on self- atomic sawtooth surface. The detailed growth mechanism is discussed accordingly.

Fig 1. Growth of single-crystal WS2 on atomic sawtooth Au surface. a) Schematic illustration of WS2 film grown via an atomic sawtooth Au surface. b) Cross-sectional ADF-STEM image and the corresponding ball-and-stick model of as-grown WS2 on an atomic sawtooth Au (533) surface. c,e,g) EBSD IPF maps and d,f,h) SEM images of coherently aligned WS2 grains on Au (5,7,11), (169), and (114) with respective (111), (110), and (100) terrace facets
DATE AND VENUE
Mar 22, 2023 (Wednesday, 5:00 - 6:00 p.m.)
LANGUAGE
Korean
INVITED BY
Dr. Kwangjin Lee

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