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Atomic mechanism of strong interactions at the graphene/sapphire interface

Author

Listed:
  • Zhipeng Dou

    (Peking University
    Hunan University)

  • Zhaolong Chen

    (Peking University)

  • Ning Li

    (Peking University
    Peking University)

  • Shenyuan Yang

    (Chinese Academy of Sciences
    University of Chinese Academy of Science)

  • Zhiwei Yu

    (Tsinghua University)

  • Yuanwei Sun

    (Peking University
    Peking University)

  • Yuehui Li

    (Peking University
    Peking University)

  • Bingyao Liu

    (Peking University)

  • Qiang Luo

    (Peking University)

  • Tianbao Ma

    (Tsinghua University)

  • Lei Liao

    (Hunan University)

  • Zhongfan Liu

    (Peking University
    Beijing Graphene Institute (BGI))

  • Peng Gao

    (Peking University
    Peking University
    Collaborative Innovation Center of Quantum Matter
    Beijing Key Laboratory of Quantum Devices)

Abstract

For atomically thin two-dimensional materials, interfacial effects may dominate the entire response of devices, because most of the atoms are in the interface/surface. Graphene/sapphire has great application in electronic devices and semiconductor thin-film growth, but the nature of this interface is largely unknown. Here we find that the sapphire surface has a strong interaction with some of the carbon atoms in graphene to form a C-O-Al configuration, indicating that the interface interaction is no longer a simple van der Waals interaction. In addition, the structural relaxation of sapphire near the interface is significantly suppressed and very different from that of a bare sapphire surface. Such an interfacial C-O-Al bond is formed during graphene growth at high temperature. Our study provides valuable insights into understanding the electronic structures of graphene on sapphire and remote control of epitaxy growth of thin films by using a graphene–sapphire substrate.

Suggested Citation

  • Zhipeng Dou & Zhaolong Chen & Ning Li & Shenyuan Yang & Zhiwei Yu & Yuanwei Sun & Yuehui Li & Bingyao Liu & Qiang Luo & Tianbao Ma & Lei Liao & Zhongfan Liu & Peng Gao, 2019. "Atomic mechanism of strong interactions at the graphene/sapphire interface," Nature Communications, Nature, vol. 10(1), pages 1-5, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-13023-6
    DOI: 10.1038/s41467-019-13023-6
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