In this work, we propose ultrathin trilayered heterostructures (TL-HTSs) of graphene (G), gallium selenide (GaSe), and molybdenum selenide () monolayers and investigate their structural and electronic properties in the framework of first-principles calculations. By calculating the binding energies and interlayer distances and comparing them with those of the typical vdW HTSs, we find that the systems we consider are energetically stable and are characterized by weak vdW interactions. The formation of G, GaSe, and monolayers to form , , and HTSs leads to the opening of a sizable bandgap in graphene at the Dirac point and shows the -type Schottky contact. Among these kinds of TL-HTSs, the has many more advantages than the others due to the lowest binding energy of Å2, the biggest bandgap opening in G of 84.7 meV, and the smallest Schottky barrier height of 0.63 eV. Furthermore, we find that the -type Schottky contact of HTS can be turned into an -type one or into an Ohmic contact when vertical strain or electric field is applied. These results show a potential candidate of the combined HTSs of G, GaSe, and monolayers for developing high speed nanoelectronic and optoelectronic devices.
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14 June 2019
Research Article|
June 12 2019
Tri-layered van der Waals heterostructures based on graphene, gallium selenide and molybdenum selenide
Khang D. Pham;
Khang D. Pham
a)
1
Laboratory of Applied Physics, Advanced Institute of Materials Science, Ton Duc Thang University
, Ho Chi Minh City 756636, Viet Nam
2
Faculty of Applied Sciences, Ton Duc Thang University
, Ho Chi Minh City 756636, Viet Nam
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Long G. Bach;
Long G. Bach
3
NTT Hi-tech Institute, Nguyen Tat Thanh University
, Ho Chi Minh City 70000, Viet Nam
4
Center of Excellence for Green Energy and Environmental Nanomaterials (CE@GrEEN), Nguyen Tat Thanh University
, Ho Chi Minh City 70000, Viet Nam
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Bin Amin;
Bin Amin
5
Department of Physics, Abbottabad University of Science and Technology
, Abbottabad 22010, Pakistan
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M. Idrees;
M. Idrees
6
Department of Physics, Hazara University
, Mansehra 21300, Pakistan
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Nguyen Ngoc Hieu
;
Nguyen Ngoc Hieu
7
Institute of Research and Development, Duy Tan University
, Da Nang 550000, Viet Nam
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Huynh V. Phuc
;
Huynh V. Phuc
8
Division of Theoretical Physics, Dong Thap University
, Cao Lanh 870000, Viet Nam
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H. D. Bui;
H. D. Bui
b)
7
Institute of Research and Development, Duy Tan University
, Da Nang 550000, Viet Nam
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Chuong V. Nguyen
Chuong V. Nguyen
b)
9
Department of Materials Science and Engineering, Le Quy Don Technical University
, Ha Noi 100000, Viet Nam
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a)
Electronic mail: phamdinhkhang@tdtu.edu.vn
b)
Authors to whom correspondence should be addressed: buidinhlpt@gmail.com and chuongnguyen11@gmail.com
J. Appl. Phys. 125, 225304 (2019)
Article history
Received:
April 11 2019
Accepted:
May 29 2019
Citation
Khang D. Pham, Long G. Bach, Bin Amin, M. Idrees, Nguyen Ngoc Hieu, Huynh V. Phuc, H. D. Bui, Chuong V. Nguyen; Tri-layered van der Waals heterostructures based on graphene, gallium selenide and molybdenum selenide. J. Appl. Phys. 14 June 2019; 125 (22): 225304. https://doi.org/10.1063/1.5099616
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