Abstract
In graphene, band gap opening and tuning are important technological challenges for device applications. Various techniques have been suggested to this technologically complicated problem. Here, we present an ab initio study on the band gap opening in graphene through vacancy, adding impurity atom in the vacancy and substitutional co-doping. In the case of graphene with single vacancy a direct band gap of ~1 eV is obtained. This is a spin polarized state. The graphene system with two monovacancies gives rise to an effective indirect band gap (pseudo gap) of ~1 eV. The graphene substitutionally doped with B and N is co-doped (tri-doped) with S. This tri-doped graphene has turned into a semiconductor (band gap ~1 eV). These graphene semiconductors are better than the other semiconductor because of the presence of massless Dirac fermions in addition to normal electrons. This will have lot of application in device industry compared to a pristine graphene because of the presence of a gap and Dirac fermions. This type of band gap opening, with this type of defects and impurities, we are reporting for the first time.
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Acknowledgments
The authors gratefully acknowledge the help by the staff members of the Center for Computational Materials Science of the Institute for Materials Research, Tohoku University, in using SR16000 supercomputer. Author K.I is thankful to AOARD for the financial support through a project (AOARD-144007). R.T thanks SRM Research Institute, SRM University for providing supercomputing facility and financial support. One of the authors (Y.K.) thanks the Russian Megagrant Project No. 14.B25.31.0030 “New energy technologies and energy carriers” for supporting the present research.
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Iyakutti, K., Mathan Kumar, E., Thapa, R. et al. Effect of multiple defects and substituted impurities on the band structure of graphene: a DFT study. J Mater Sci: Mater Electron 27, 12669–12679 (2016). https://doi.org/10.1007/s10854-016-5401-9
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DOI: https://doi.org/10.1007/s10854-016-5401-9