S
Sang Hoon Chae
Researcher at Columbia University
Publications - 50
Citations - 4559
Sang Hoon Chae is an academic researcher from Columbia University. The author has contributed to research in topics: Graphene & Monolayer. The author has an hindex of 23, co-authored 41 publications receiving 3618 citations. Previous affiliations of Sang Hoon Chae include Sungkyunkwan University.
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Journal ArticleDOI
Synthesis of large-area multilayer hexagonal boron nitride for high material performance
Soo Min Kim,Allen Hsu,Min-Ho Park,Sang Hoon Chae,Seok Joon Yun,Joo Song Lee,Dae-Hyun Cho,Wenjing Fang,Changgu Lee,Tomas Palacios,Mildred S. Dresselhaus,Ki Kang Kim,Young Hee Lee,Jing Kong +13 more
TL;DR: By placing additional h-BN on a SiO2/Si substrate for a MoS2 (WSe2) field-effect transistor, the doping effect from gate oxide is minimized and furthermore the mobility is improved by four (150) times.
Journal ArticleDOI
Disorder in van der Waals heterostructures of 2D materials
TL;DR: The progress in disorder control for graphene and TMDs is discussed, as well as in van der Waals heterostructures realized by combining these materials with hexagonal boron nitride.
Journal ArticleDOI
Probing graphene grain boundaries with optical microscopy
Dinh Loc Duong,Gang Hee Han,Seung Mi Lee,Fethullah Güneş,Eun Sung Kim,Sung Tae Kim,Heetae Kim,Quang Huy Ta,Kang Pyo So,Seok Jun Yoon,Seung Jin Chae,Young Woo Jo,Min-Ho Park,Sang Hoon Chae,Seong Chu Lim,Jae-Young Choi,Jae-Young Choi,Young Hee Lee +17 more
Abstract: Grain boundaries in graphene are formed by the joining of islands during the initial growth stage, and these boundaries govern transport properties and related device performance. Although information on the atomic rearrangement at graphene grain boundaries can be obtained using transmission electron microscopy and scanning tunnelling microscopy, large-scale information regarding the distribution of graphene grain boundaries is not easily accessible. Here we use optical microscopy to observe the grain boundaries of large-area graphene (grown on copper foil) directly, without transfer of the graphene. This imaging technique was realized by selectively oxidizing the underlying copper foil through graphene grain boundaries functionalized with O and OH radicals generated by ultraviolet irradiation under moisture-rich ambient conditions: selective diffusion of oxygen radicals through OH-functionalized defect sites was demonstrated by density functional calculations. The sheet resistance of large-area graphene decreased as the graphene grain sizes increased, but no strong correlation with the grain size of the copper was revealed, in contrast to a previous report. Furthermore, the influence of graphene grain boundaries on crack propagation (initialized by bending) and termination was clearly visualized using our technique. Our approach can be used as a simple protocol for evaluating the grain boundaries of other two-dimensional layered structures, such as boron nitride and exfoliated clays.
Journal Article
Synthesis of large-area multilayer hexagonal boron nitride for high material performance
Soo Min Kim,Allen Hsu,Min-Ho Park,Sang Hoon Chae,Seok Joon Yun,Joo Song Lee,Dae-Hyun Cho,Wenjing Fang,Changgu Lee,Tomas Palacios,Mildred S. Dresselhaus,Ki Kang Kim,Young Hee Lee,Jing Kong +13 more
TL;DR: In this article, a large-area multilayer hexagonal boron nitride (h-BN) film was synthesized on Fe foil using chemical vapour deposition (CVD) with a borazine precursor.
Journal ArticleDOI
Seamless Stitching of Graphene Domains on Polished Copper (111) Foil
Van Luan Nguyen,Bong Gyu Shin,Dinh Loc Duong,Sung Tae Kim,David J. Perello,Young Jin Lim,Qinghong Yuan,Feng Ding,Hu Young Jeong,Hyeon Suk Shin,Seung Mi Lee,Sang Hoon Chae,Quoc An Vu,Seung Hee Lee,Young Hee Lee +14 more
TL;DR: Using this concept of seamless stitching, synthesis of 6 cm × 3 cm monocrystalline graphene without grain boundaries on polished copper (111) foil is possible, which is only limited by the chamber size.