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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/108025

    Title: Nonlinear bandgap opening behavior of BN co-doped graphene
    Authors: Wang, Bo-Yao;Wang, Hsiao-Tsu;Chen, Ling-Yen;Hsueh, Hung-Chung;Li, Xin;Guo, Jing-Hua;Luo, Yi;Chiou, Jau-Wern;Wang, Wei-Hua;Wang, Po-Hsiang;Chen, Kuei-Hsien;Chen, Yen-Chih;Chen, Li-Chyong;Chen, Chia-Hao;Wang, Jian;Pong, Way-Faung
    Date: 2016-10-01
    Issue Date: 2016-10-22 02:10:40 (UTC+8)
    Publisher: Pergamon Press
    Abstract: We have demonstrated a nonlinear behavior for the bandgap opening of doped graphene by controlling the concentration of B and N co-dopants. X-ray absorption and emission spectra reveal that the bandgap increases from 0 to 0.6 eV as the concentration of BN dopants is increased from 0 to 6%, while the bandgap closes when the doping concentration becomes 56%. This nonlinear behavior of bandgap opening of the BN-doped graphene depending on the BN concentrations is consistent with the valence-band photoemission spectroscopic measurements. The spatially resolved B, N and C K-edge scanning transmission x-ray microscopy and their x-ray absorption near-edge structure spectra all support the scenario of the development of h-BN-like domains at high concentrations of BN. Ab initio calculation, by taking into account of the strong correlation between the bandgap and the geometry/concentration of the dopant, has been performed with various BN-dopant nano-domains embedded in the graphene monolayer to verify the unique bandgap behavior. Based on the experimental measurements and ab initio calculation, we propose the progressive formation of a phase-separated zigzag-edged BN domain from BN quantum dots with increasing BN-dopant concentration to explain the extraordinary nonlinear behavior of bandgap opening of BN-doped graphene sheets. This study reveals a new way to engineer the bandgap of low-dimensional systems.
    Relation: Carbon 107, pp.857-864
    DOI: 10.1016/j.carbon.2016.06.091
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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