Journal ArticleDOI
Energy Level Alignment and Charge Carrier Mobility in Noncovalently Functionalized Graphene
TLDR
In this paper, density functional theory calculations have been performed to assess the electronic structure of graphene overlaid with a monolayer of electro-active conjugated molecules, being either electron donors or electron acceptors.Abstract:
Density functional theory calculations have been performed to assess the electronic structure of graphene overlaid with a monolayer of electro-active conjugated molecules, being either electron donors or electron acceptors. Such a noncovalent functionalization results in a work function modification that scales with the amount of electron transfer from or to graphene, in line with the formation of an interfacial dipole. The charge transfer is accompanied by a pinning of the donor HOMO/acceptor LUMO around the Fermi level and a shift in the vacuum level. The use of the Boltzmann transport equation combined with the deformation potential theory shows that large charge carrier mobilities are maintained upon noncovalent functionalization of graphene, thereby suggesting that molecular doping is an attractive approach to design conductive graphene electrodes with tailored work function.read more
Citations
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Energetics, Charge Transfer, and Magnetism of Small Molecules Physisorbed on Phosphorene
TL;DR: In this paper, the interaction of physisorbed small molecules, including CO, H2, H 2O, NH3, NO, NO2, and O2, with phosphorene, and their energetics, charge transfer, and magnetic moment are evaluated on the basis of dispersion-corrected density functional theory.
Journal ArticleDOI
A first-principles study of gas adsorption on germanene
TL;DR: Different adsorption behaviors of common gas molecules on germanene provide a feasible way to exploit chemically modified germanenes.
Journal ArticleDOI
Silicene as a highly sensitive molecule sensor for NH3, NO and NO2
TL;DR: The calculated charge carrier concentrations of NO2-chemisorbed silicene are 3 orders of magnitude larger than intrinsic charge carrier concentration of graphene at room temperature, presenting a great potential of silicenes for application as a highly sensitive molecule sensor.
Journal ArticleDOI
Single-Layered Hittorf’s Phosphorus: A Wide-Bandgap High Mobility 2D Material
Georg Schusteritsch,Georg Schusteritsch,Martin Uhrin,Martin Uhrin,Chris J. Pickard,Chris J. Pickard,Chris J. Pickard +6 more
TL;DR: The proposed two-dimensional material based on a single layer of violet or Hittorf's phosphorus is found to be energetically very stable, comparable to other previously proposed single-layered phosphorus structures, and to have a high and highly anisotropic hole mobility.
Journal ArticleDOI
Surface Charge Transfer Doping of Low-Dimensional Nanostructures toward High-Performance Nanodevices.
TL;DR: The surface charge transfer doping (SCTD) is emerging as a simple yet efficient technique to achieve reliable doping in a nondestructive manner, which can modulate the carrier concentration by injecting or extracting the carrier charges between the surface dopant and semiconductor due to the work-function difference.
References
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Journal ArticleDOI
Generalized Gradient Approximation Made Simple
TL;DR: A simple derivation of a simple GGA is presented, in which all parameters (other than those in LSD) are fundamental constants, and only general features of the detailed construction underlying the Perdew-Wang 1991 (PW91) GGA are invoked.
Journal ArticleDOI
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set.
Georg Kresse,Jürgen Furthmüller +1 more
TL;DR: An efficient scheme for calculating the Kohn-Sham ground state of metallic systems using pseudopotentials and a plane-wave basis set is presented and the application of Pulay's DIIS method to the iterative diagonalization of large matrices will be discussed.
Journal ArticleDOI
Electric Field Effect in Atomically Thin Carbon Films
Kostya S. Novoselov,Andre K. Geim,Sergey V. Morozov,Da Jiang,Y. Zhang,S. V. Dubonos,Irina V. Grigorieva,A. A. Firsov +7 more
TL;DR: Monocrystalline graphitic films are found to be a two-dimensional semimetal with a tiny overlap between valence and conductance bands and they exhibit a strong ambipolar electric field effect.
Journal ArticleDOI
Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set
Georg Kresse,Jürgen Furthmüller +1 more
TL;DR: A detailed description and comparison of algorithms for performing ab-initio quantum-mechanical calculations using pseudopotentials and a plane-wave basis set is presented in this article. But this is not a comparison of our algorithm with the one presented in this paper.
Journal ArticleDOI
Ab initio molecular dynamics for liquid metals.
Georg Kresse,Jürgen Hafner +1 more
TL;DR: In this paper, the authors present an ab initio quantum-mechanical molecular-dynamics calculations based on the calculation of the electronic ground state and of the Hellmann-Feynman forces in the local density approximation.