Lattice vacancy effects on electron transport in multiterminal graphene nanodevices

Jayasekera, Thushari; Mintmire, J. W.

doi:10.1002/qua.21437

Cited by 5 publications

(5 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, a combination of the carrier deficiency at the sp 3 site, the associated disruption of the electron‐potential continuum, and the distorted planar lattice causes a drastic reduction in graphene's carrier mobility and a change in charge polarity/density. For example, in comparison to graphene (room temperature mobility = 10 000–50 000 cm 2 /V/s and intrinsic mobility limit 200 000 cm 2 /V/s), RGO, with few residual oxy groups, exhibits a drastically reduced carrier mobility (0.05–200 cm 2 /V/s), p‐type behavior, and a finite effective bandgap33–35 of 0.2 to 2 eV 36, 37. It is important to note that a more accurate depiction of a functionalization‐induced band structure change can be predicted by density functional theory and Green's function simulations, which are not discussed in this review.…”

Section: Covalently Functionalized Graphenementioning

confidence: 99%

How Do the Electrical Properties of Graphene Change with its Functionalization?

Sreeprasad

Berry

2012

Small

309

225

View full text Add to dashboard Cite

Functionalization of graphene is essential to interface it with other moieties to expand the scope of its electrical/electronic applications. However, chemical functionalization and/or molecular interactions on graphene sensitively modulate its electrical properties. To evaluate and take advantage of the properties of functionalized graphene, it is important to understand how its electrical attributes (such as carrier scattering, carrier concentration, charge polarity, quantum-capacitance enhanced doping, energy levels, transport mechanisms, and orbital hybridization of energy-bands) are influenced by a change in carbon's structural conformation, hybridization state, chemical potential, local energy levels, and dopant/interface coupling induced via functionalization or molecular interactions. Here, a detailed and integrated model describes factors influencing these electrical characteristics of functionalized graphene (covalent bonds, adsorption, π-π bonds, and lattice incorporation). The electrical properties are governed via three mechanisms: (a) conversion of carbon's hybridized state, (b) dipole interactions enhanced via quantum capacitance, and (c) orbital hybridization with an interfacing molecule. A few graphenic materials are also identified where further studies are essential to understand the effect of their functionalization.

show abstract

Section: Covalently Functionalized Graphenementioning

confidence: 99%

How Do the Electrical Properties of Graphene Change with its Functionalization?

Sreeprasad

Berry

2012

Small

309

225

View full text Add to dashboard Cite

show abstract

“…21 Another broadly employed approach for the edge modication in ZGNR is to make a structural hybrid combining zigzag and armchair nanoribbon (as the initial structural motif) and then cutting it in different shapes according to the structural orientations. [22][23][24][25] Particularly in ZGNR, relatively large contributions from the edge states account the high density of states (DOS) at the Fermi level. 26 Now, some spin unresolved calculations suggest magnetic instability to the system in turns splitting the edge states around the Fermi level.…”

Section: Introductionmentioning

confidence: 99%

Understanding the spin-dependent electronic properties of symmetrically far-edge doped zigzag graphene nanoribbon from a first principles study

Sarmah

Hobza

2017

RSC Adv.

View full text Add to dashboard Cite

We have systematically elucidated the electronic and spin dependent behavior of far-edge doped zigzag graphene nanoribbons from a DFT based first principles study. The relative changes in the electronic environment due to an increment in the impurity concentration as well as the size of the hexagonal carbon network have been thoroughly assayed. Although the substitutional doping is most favorable at the edges of the nanoribbons, our DFT simulations envision that far-edge doping also induced some tunable spin-dependent properties in the zigzag graphene nanoribbons. The total magnetic moment of the systems seems to have some sequential dependencies on the doping concentration along with the relative growth in the crystal lattice. It is observed that the impurity (boron or nitrogen) doping at the faredge sites can break the electronic degeneracy in the up and down spin channels. Interestingly, in both cases spin-up electrons are found to be metallic or semi-metallic and the spin-down electrons demonstrate an insulating nature.

show abstract

“…Some researchers have adopted an approach similar to that of conventional semiconductor industry and focused on ion impurities and vacancies (doping). , Others have incorporated adsorbed molecules or ions at the edges or studied the effect of different substrates. Another promising approach consists of joining an armchair and a zigzag nanoribbon by rotating the cutting direction, resulting in Z-shaped, − T-shaped, , L-shaped, , cross-shaped, − and arrow-shaped − graphene nanoribbon intramolecular junctions.…”

mentioning

confidence: 99%

Spin Polarized Conductance in Hybrid Graphene Nanoribbons Using 5−7 Defects

et al. 2009

View full text Add to dashboard Cite

We present a class of intramolecular graphene heterojunctions and use first-principles density functional calculations to describe their electronic, magnetic, and transport properties. The hybrid graphene and hybrid graphene nanoribbons have both armchair and zigzag features that are separated by an interface made up of pentagonal and heptagonal carbon rings. Contrary to conventional graphene sheets, the computed electronic density of states indicates that all hybrid graphene and nanoribbon systems are metallic. Hybrid nanoribbons are found to exhibit a remarkable width-dependent magnetic behavior and behave as spin polarized conductors.

show abstract

Lattice vacancy effects on electron transport in multiterminal graphene nanodevices

Cited by 5 publications

References 35 publications

How Do the Electrical Properties of Graphene Change with its Functionalization?

How Do the Electrical Properties of Graphene Change with its Functionalization?

Understanding the spin-dependent electronic properties of symmetrically far-edge doped zigzag graphene nanoribbon from a first principles study

Spin Polarized Conductance in Hybrid Graphene Nanoribbons Using 5−7 Defects

Contact Info

Product

Resources

About