journal article·2021-06-22

Large-Area Bernal-Stacked Bilayer Graphene Film on a Uniformly Rough Cu Surface via Chemical Vapor Deposition

Myungwoo Son, Jaewon Jang, Gi-Hwan Kim, Ji-Hwan Lee, Dong Won Chun, Jee-Hwan Bae, In S. Kim, Moon-Ho Ham, Sang-Soo Chee

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Abstract

Herein, we introduced surface modification of a Cu catalyst by employing CH4 pre-annealing, which changed the uniformly rough Cu surface; this resulted in formation of high-quality and uniform Bernal-stacked bilayer graphene as well as monolayer graphene due to controlled synthesis time. A well-designed Cu surface was developed for synthesis of bilayer graphene with high coverage (>95%) and a high Bernal-stacking ratio (∼99%). Dual-gated transistors of Bernal-stacked bilayer graphene showed typical tunable transfer characteristics under varying gate voltages with carrier mobilities of 1000–2000 cm2 V–1 s–1. Through density functional theory calculations, we demonstrated that a uniformly rough Cu surface is favorable for synthesis of Bernal-stacked bilayer graphene. Finally, we employed bilayer graphene as a perfect diffusion barrier facilitated by complementing the diffusion pathway of numerous grain boundaries in graphene.
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Research context

OpenAlex topics: Graphene research and applications · Quantum and electron transport phenomena · Molecular Junctions and Nanostructures

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Artificial Intelligence and Energy Research Center, Korea Photonics Technology Institute (KOPTI), Cheomdanbencheo-ro 108 beon-gil 9, Buk-gu, Gwangju 61007, Republic of Korea

School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea

Global Desalination Research Center, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea

Department of Materials Engineering and Convergence Technology, Gyeongsang National University, 501 Jinju-daero, Jinju-si, Gyeongsangnam-do 52828, Republic of Korea

Future Technology Research Center, SK Hynix, 2091 Gyeongchung-daero, Icheon-si, Gyeonggi-do 17336, Republic of Korea

Advanced Analysis Center, Korea Institute of Science and Technology (KIST), 5 Hwarang-ro 14, Seongbuk-gu, Seoul 02792, Republic of Korea

School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea

Nanomaterials and Nanotechnology Center, Korea Institute of Ceramic Engineering and Technology (KICET), 101 Soho-ro, Jinju-si, Gyeongsangnam-do 52851, Republic of Korea

Funding

National Research Foundation of Korea · Ministry of Trade, Industry and Energy

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