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Jichen Dong
다차원 탄소재료 연구단
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Edge-Controlled Growth and Etching of Two-Dimensional GaSe Monolayers

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Title
Edge-Controlled Growth and Etching of Two-Dimensional GaSe Monolayers
Author(s)
Xufan Li; Jichen Dong; Juan C. Idrobo; Alexander A. Puretzky; Christopher M. Rouleau; David B. Geohegan; Feng Ding; Kai Xiao
Publication Date
2017-01
Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.139, no.1, pp.482 - 491
Publisher
AMER CHEMICAL SOC
Abstract
Understanding the atomistic mechanisms governing the growth of two-dimensional (2D) materials is of great importance in guiding the synthesis of wafer-sized, single-crystalline, high-quality 2D crystals and heterostructures. Etching, in many cases regarded as the reverse process of material growth, has been used to study the growth kinetics of graphene. In this work, we explore a growth-etching-regrowth process of monolayer GaSe crystals, including single-crystalline triangles and irregularly shaped domains formed by merged triangles. We show that the etching begins at a slow rate, creating triangular, truncated triangular, or hexagonally shaped holes that eventually evolve to exclusively triangles that are rotated 60 degrees with respect to the crystalline orientation of the monolayer triangular crystals. The regrowth occurs much faster than etching, reversibly filling the etched holes and then enlarging the size of the monolayer crystals. A theoretical model developed based on kinetic Wulff construction (KWC) theory and density functional theory (DFT) calculations accurately describe the observed morphology evolution of the monolayer GaSe crystals and etched holes during the growth and etching processes, showing that they are governed by the probability of atom attachment/detachment to/from different types of edges with different formation energies of nucleus/dents mediated by chemical potential difference Ait between Ga and Se. Our growth-etching-regrowth study provides not only guidance to understand the growth mechanisms of 2D binary crystals but also a potential method for the synthesis of large, shape-controllable, high-quality single-crystalline 2D crystals and their lateral heterostructures © 2016 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/3588
ISSN
0002-7863
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > Journal Papers (저널논문)
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