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Insights from first principles graphene/g-C2N bilayer: gap opening, enhanced visible light response and electrical field tuning band structure

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Abstract

Opening up a band gap of the graphene and finding a suitable substrate are two challenges for constituting the nano-electronic equipment. A new two-dimensional layered crystal g-C2N with novel electronic and optical properties can be effectively synthesized via a wet-chemical reaction. And g-C2N can be used as a suitable substrate to open the band gap of graphene as much as 0.239 eV, which is large enough for the band gap opening at room temperature. The physics behind the band gap opening is that g-C2N substrate can produce the inhomogeneous electrostatic potential over the graphene layer. The imposition of external electrical field can effectively tune the electronic properties of the hybrid graphene/g-C2N from the semiconductors to the metal. The hybrid graphene/g-C2N displays an enhanced optical activity compared with the pure g-C2N monolayer.

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Acknowledgements

We thank Prof. Shuanglin Hu and Prof. Wenhui Duan for useful discussions. This work is partially supported by the National Key Basic Research Program, and by USTCSCC, SCCAS, Tianjin, Shanghai Supercomputer Centers and Tsinghua Supercomputer Centers are acknowledged.

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  1. Zhaoyong Guan

    Present address: Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621900, Sichuan, People’s Republic of China

Authors and Affiliations

  1. Key Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing, 100084, People’s Republic of China

    Zhaoyong Guan

  2. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, Sichuan, People’s Republic of China

    Shuang Ni

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Guan, Z., Ni, S. Insights from first principles graphene/g-C2N bilayer: gap opening, enhanced visible light response and electrical field tuning band structure. Appl. Phys. A 123, 678 (2017). https://doi.org/10.1007/s00339-017-1314-6

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