Modeling comparison of graphene nanoribbon field effect transistors with single vacancy defect

Nazari, Atefeh; Faez, Rahim; Shamloo, Hassan

doi:10.1016/j.spmi.2016.06.008

Cited by 32 publications

(14 citation statements)

References 36 publications

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“…The optical effective mass of InAs/GaAs is reported in ref . The optical effective mass of single and bilayer graphene is reported using eqs and , , and we followed these equations for Al 2 O 3 /NiO. where k is the angular wave vector ( k = n ω), f is the radio frequency, c is the velocity of light, 2π is one cycle per angular momentum, j is the imaginary unit of TE–TM waves, m op * is the optical effective mass, and ℏ = 1.054 × 10 –34 J·s as reduced Planck’s constant. From the HR-TEM measurements, the area of the single spherical particle of Al 2 O 3 /NiO is n = 1.1304 × 10 –22 m 2 .…”

Section: Resultsmentioning

confidence: 99%

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Experimental Study of Effective Mass and Spin–Orbital Energy of the Al₂O₃/NiO Nanoheterostructure Material

et al. 2019

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The effective mass of the materials relies on exciton dynamics which is greatly dominated by energy gap of the materials. We examined the effective mass for the Al 2 O 3 /NiO nanoheterostructure material through polarization in the dielectric study. The mean optical effective mass was calculated to be m opt * = 5.69645 × 10 −20 m op /m 0 in the UV−visible region (1 × 10 6 to 5.4 × 10 6 Hz). From the group and phase velocity values, we observed that Al 2 O 3 /NiO is an anisotropic material. The electron spin−orbit energy splitting associated to electron in the valence band was identified using the Gaussianconfining 3D potential under normalized angular momentum (n, l = 0, 1, 2, 3). The 1S ( 1 S 1/2 ) and 2S ( 2 S 1/2 ) orbital ionization energies were calculated to be −6.08 and −5.99 eV for AlO 3 /NiO. The orbital ionization energies were established from the Bohr radius a B = 5.29 × 10 −11 m and donor Rydberg constant R y = 1.097 × 10 7 m −1 of the identical hydrogen atom. Our study gives insights into the exciton dynamics and calculation of orbital energy for the nanoheterostructure materials.

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Section: Resultsmentioning

confidence: 99%

“…The optical effective mass of InAs/GaAs is reported in ref 47. The optical effective mass of single and bilayer graphene is reported using eqs 7 and 8, 48,49 and we followed these equations for Al 2 O 3 /NiO.…”

Section: Exciton Phase Velocity (V P ) and (B) Groupmentioning

confidence: 99%

Experimental Study of Effective Mass and Spin–Orbital Energy of the Al₂O₃/NiO Nanoheterostructure Material

et al. 2019

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“…However, graphene as the two dimensional (2D) material has a zero bandgap resulting in undesirable limitations in semiconductor device applications. In electronic devices, semiconductors with a tunable bandgap are required [10][11][12][13][14][15][16][17]. To overcome this issue, several methods such as application of strain [18,19], adsorption of suitable elements [20,21], utilizing nanoribbons of graphene [9,17,[22][23][24], application of an external potential [25,26], layered stacking [27,28], Doping with other elements such as Boron and Nitrogen [8,9,29] and creation of defects such as antidotes [9,30,31] are among the methods which have been proposed in the literature.…”

Section: Introductionmentioning

confidence: 99%

Impact of an antidote vacancy on the electronic and transport properties of germanene nanoribbons: A first principles study

Samipour

Dideban

Heidari

2020

Journal of Physics and Chemistry of Solids

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In this article, we investigate the effect of various antidote defects on the electronic properties and current characteristics of an armchair Germanene nanoribbon (AGeNR) using density functional theory (DFT) and non-equilibrium Green's function (NEGF) method. The defected AGeNRs are introduced by setting antidote topologies in the pristine nanoribbons, resulting in antidote superlattice of AGeNRs. It is found that new electronic properties appear due to the presence of defects. The obtained results indicate that bandgap of the defected AGeNRs can be increased or decreased in different cases. Moreover, the transport properties are analyzed based on the various defect locations in the AGeNR when the ribbon is utilized as the channel of a tunneling field effect transistor (TFET). Based on our results, it is found that the presence of antidote defects leads to reduction or increase in the current, drifting the Dirac point, and decreasing or increasing the minimum or off-state current.

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“…Moreover, bilayer graphene can be used for this purpose, which is synthesized with difficulty [23,24]. One can manipulate electrical and magnetic properties of graphene by introducing different defect state in graphene [25,26]. Because all atoms are placed on the surface of graphene, density of electrons is high on it, so active is the graphene sheet that it can easily react with the gases in the surrounding atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Surface-Modified Graphene for Mid-Infrared Detection

Siahsar¹,

Dolatyari²,

Rostami³

et al. 2017

Graphene Materials - Advanced Applications

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In this chapter, morphology variation and electronic structure in a surface-modified graphene are demonstrated by both calculation and experimental results. The results indicate that the band structure and morphology of modified graphene sheets are altered because of changing in the type of hybridization of carbon atoms in the graphene sheet. Accordingly, the band gap of graphene can be tuned by surface modification using organic molecules. Then, modified graphene is used for fabrication of infrared detectors. The properties of unmodified graphene photodetectors were also measured so as to compare with modified graphene photodetectors. The results demonstrate that modification of graphene using organic ligands improved the detection parameters such as fast response time, electrical stability and low dark current. Moreover, the sensitivity of photodetectors based on modified graphene was significantly improved.

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Modeling comparison of graphene nanoribbon field effect transistors with single vacancy defect

Cited by 32 publications

References 36 publications

Experimental Study of Effective Mass and Spin–Orbital Energy of the Al₂O₃/NiO Nanoheterostructure Material

Experimental Study of Effective Mass and Spin–Orbital Energy of the Al₂O₃/NiO Nanoheterostructure Material

Impact of an antidote vacancy on the electronic and transport properties of germanene nanoribbons: A first principles study

Surface-Modified Graphene for Mid-Infrared Detection

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Modeling comparison of graphene nanoribbon field effect transistors with single vacancy defect

Cited by 32 publications

References 36 publications

Experimental Study of Effective Mass and Spin–Orbital Energy of the Al2O3/NiO Nanoheterostructure Material

Experimental Study of Effective Mass and Spin–Orbital Energy of the Al2O3/NiO Nanoheterostructure Material

Impact of an antidote vacancy on the electronic and transport properties of germanene nanoribbons: A first principles study

Surface-Modified Graphene for Mid-Infrared Detection

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Product

Resources

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Experimental Study of Effective Mass and Spin–Orbital Energy of the Al₂O₃/NiO Nanoheterostructure Material

Experimental Study of Effective Mass and Spin–Orbital Energy of the Al₂O₃/NiO Nanoheterostructure Material