DFT investigations on photoelectric properties of graphene modified by metal atoms

DFT investigations on photoelectric properties of graphene modified by metal atoms
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金属原子修饰石墨烯光电性能的DFT研究

DOI:
10.1080/00150193.2020.1811038
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发表时间:
2020-11
期刊:
影响因子:
0.8
通讯作者:
Hongchen Liu
Hongchen Liu
中科院分区:
材料科学4区
文献类型:
--
作者:
Xiaoshuang Dai;Tao Shen;Jiaojiao Chen;Hongchen Liu

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摘要采用密度泛函理论研究了纯石墨烯、锰掺杂石墨烯、铁掺杂石墨烯和钴掺杂石墨烯的光电性质。掺杂的石墨烯表现出有趣的电子和光学性质的调谐。Mn掺杂的石墨烯的带隙差距值最大,为0.312 eV,其次是Fe掺杂的石墨烯,为0.214 eV,Co掺杂的石墨烯,为0.070 eV。掺杂后石墨烯的吸收峰变弱,尤其是Mn掺杂后的吸收峰。掺杂石墨烯的光吸收边向高能区有明显的蓝移。此外,能量损失函数的峰值也较低,说明金属原子的引入降低了等离子体的激发能量。
Abstract The photoelectric properties of pristine, Mn-doped, Fe-doped and Co-doped graphene are investigated by DFT investigation. Doped graphene exhibits interesting tuning of electronic and optical properties. The gap value of Mn-doped graphene is the largest, 0.312 eV, then Fe-doped graphene, 0.214 eV, and Co-doped graphene, 0.070 eV. The absorption peaks of doped graphene become weak, especially the peaks of Mn-doped graphene. The optical absorption edge of doped graphene have a clear blue-shift to a higher energy region. Besides, the peaks of energy loss function are much lower, indicating that the introduction of metal atoms reduces the excitation energy of the plasma.
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