Electronic Properties of Various Graphene Quantum Dot Structures: an Ab Initio Study

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ghandchi M.; DARVISH G.; MORAVEJ FARSHI M.K.

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Journal Paper

Paper Information

Journal: Tabriz Journal of Electrical Engineering Year:2021 | Volume:51 | Issue:2 (96) Page(s): 213-220

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Information Journal Paper

Title

Electronic Properties of Various Graphene Quantum Dot Structures: an Ab Initio Study

Author(s)

ghandchi M. | DARVISH G. | MORAVEJ FARSHI M.K. | Issue Writer Certificate

Keywords

Band structure

bandgap

density-functional theory (DFT)

graphene

graphene quantum dot (GQD)

Abstract

Density functional theory (DFT) and thermal DFT (thDFT) calculations were used to evaluate the energy Band structure, bandgap, and the total energy of various graphene quantum dots (GQDs). The DFT calculations were performed using local density approximation for the exchange-correlation functional and norm-conserving pseudopotentials. We consider the triangular and hexagonal GQDs with zigzag and armchair edges and 1-3 nm dimensions with many hundred atoms. The simulation results show that all of these GQDs are direct bandgap semiconductors with a flat Band structure, and they are suitable for electronics and optoelectronics applications. Analysis of GQDs in which the A and B sublattice symmetries were broken showed degenerate zero-energy shells. Using the thDFT calculations carried out at temperatures up to 1400 K, we evaluated the temperature dependence of the GQDs bandgaps and total energies via entropy-term and electron’ s kinetic energy. The obtained results indicate that the ground-state DFT calculations are valid for determining the electronic properties of GQDs up to room temperature. Moreover, we tune semi-empirical parameters of the tight-binding model by the DFT results in small GQDs to reduce the computational cost of electronic structure calculations for large GQDs, which contained up to thousands of atoms.

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APA: Copy

ghandchi, M., DARVISH, G., & MORAVEJ FARSHI, M.K.. (2021). Electronic Properties of Various Graphene Quantum Dot Structures: an Ab Initio Study. TABRIZ JOURNAL OF ELECTRICAL ENGINEERING, 51(2 (96)), 213-220. SID. https://sid.ir/paper/982858/en

Vancouver: Copy

ghandchi M., DARVISH G., MORAVEJ FARSHI M.K.. Electronic Properties of Various Graphene Quantum Dot Structures: an Ab Initio Study. TABRIZ JOURNAL OF ELECTRICAL ENGINEERING[Internet]. 2021;51(2 (96)):213-220. Available from: https://sid.ir/paper/982858/en

IEEE: Copy

M. ghandchi, G. DARVISH, and M.K. MORAVEJ FARSHI, “Electronic Properties of Various Graphene Quantum Dot Structures: an Ab Initio Study,” TABRIZ JOURNAL OF ELECTRICAL ENGINEERING, vol. 51, no. 2 (96), pp. 213–220, 2021, [Online]. Available: https://sid.ir/paper/982858/en

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