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Electric field-tunable electronic structures of 2D alkaline-earth metal hydroxide–graphene heterostructures

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Abstract

Based on first-principles calculations, we study the electronic structures of 2D alkaline-earth metal hydroxide X(OH)2/graphene (X = Ca, Mg) heterostructures. The results show that the characteristics of the band gap size of X(OH)2 and Dirac cone of graphene are preserved well, and p-type Schottky barriers with a small Schottky barrier height (SBH) are formed in the hetero-multilayers. Moreover, double Dirac cones are also found in the X(OH)2/bilayer graphene (X(OH)2/BLG) cases. Interestingly, negative electric fields can easily induce the transition from p-type Schottky to Ohmic contact, while the p-type to n-type Schottky transition can be realized by positive electric fields. In addition, the electric field-modulations of the Schottky barrier are more sensitive in the X(OH)2/BLG systems. These studies may open the possibility of using X(OH)2/graphene as building blocks in the fabrication of Schottky devices.

Graphical abstract: Electric field-tunable electronic structures of 2D alkaline-earth metal hydroxide–graphene heterostructures

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Publication details

The article was received on 24 May 2017, accepted on 25 Jun 2017 and first published on 26 Jun 2017


Article type: Paper
DOI: 10.1039/C7TC02288C
Citation: J. Mater. Chem. C, 2017, Advance Article
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    Electric field-tunable electronic structures of 2D alkaline-earth metal hydroxide–graphene heterostructures

    C. Xia, Q. Gao, W. Xiong, J. Du, X. Zhao, T. Wang, Z. Wei and J. Li, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC02288C

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