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Sun, Luzhao; Wang, Zihao; Wang, Yuechen; Zhao, Liang; Li, Yanglizhi; Chen, Buhang; Huang, Shenghong; Zhang, Shishu; Wang, Wendong; Pei, Ding; Fang, Hongwei; Zhong, Shan; Liu, Haiyang; Zhang, Jincan; Tong, Lianming; Chen, Yulin; Li, Zhenyu; Rümmeli, Mark H; Novoselov, Kostya S; Peng, Hailin; Lin, Li; Liu, Zhongfan
Nature communications, 04/2021, Volume: 12, Issue: 1Journal Article
Twisted bilayer graphene (tBLG) has recently attracted growing interest due to its unique twist-angle-dependent electronic properties. The preparation of high-quality large-area bilayer graphene with rich rotation angles would be important for the investigation of angle-dependent physics and applications, which, however, is still challenging. Here, we demonstrate a chemical vapor deposition (CVD) approach for growing high-quality tBLG using a hetero-site nucleation strategy, which enables the nucleation of the second layer at a different site from that of the first layer. The fraction of tBLGs in bilayer graphene domains with twist angles ranging from 0° to 30° was found to be improved to 88%, which is significantly higher than those reported previously. The hetero-site nucleation behavior was carefully investigated using an isotope-labeling technique. Furthermore, the clear Moiré patterns and ultrahigh room-temperature carrier mobility of 68,000 cm V s confirmed the high crystalline quality of our tBLG. Our study opens an avenue for the controllable growth of tBLGs for both fundamental research and practical applications.
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