• Infrared and Laser Engineering
  • Vol. 44, Issue 11, 3191 (2015)
Li Shilong1、2、*, Shi Feng1、2, Zhang Taimin1、2, Liu Zhaolu1、2, Zhang Fan1、2, Li Dan1、2, and Ren Zhaoyu3
Author Affiliations
  • 1[in Chinese]
  • 2[in Chinese]
  • 3[in Chinese]
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    DOI: Cite this Article
    Li Shilong, Shi Feng, Zhang Taimin, Liu Zhaolu, Zhang Fan, Li Dan, Ren Zhaoyu. Band gap design of graphene photocathode[J]. Infrared and Laser Engineering, 2015, 44(11): 3191 Copy Citation Text show less

    Abstract

    In order to achieve graphene photocathode photoelectric conversion function, hexagonal boron nitride was doped in graphene in the form of hybrid superlattices nanoribbons. As can be seen from the band structure which was obtained by applying first-principles methods, the band gap of the superlattices was effectively regulated in a wide range(0-2.5 eV) by this means. The mechanism of band gap regulation was analyzed by the energy band structure and the charge density distribution. Furthermore, the present results were coincidence with the conclusion of Kronig-Penney model. With the increase of the h-BN proportion, the band gap engineering of graphene materials in this way, the band gap increases both zigzag edges superlattices nanoribbons and armchair edges superlattices nanoribbons. Besides, the band gap is almost independent of the width of nanoribbons, thus the size of the material can be more miniaturized. Moreover, the graphene photocathode with the gradient band gap characteristic can be made based on this approach, it can respond to different spectral ranges.
    Li Shilong, Shi Feng, Zhang Taimin, Liu Zhaolu, Zhang Fan, Li Dan, Ren Zhaoyu. Band gap design of graphene photocathode[J]. Infrared and Laser Engineering, 2015, 44(11): 3191
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