Thermopower of multilayer graphene

Hao, Lei; Lee, T. K.

doi:10.1103/physrevb.82.245415

Cited by 12 publications

(4 citation statements)

References 66 publications

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“…If a band gap of 288 meV is induced in a bilayer system by an external vertical field, it has been calculated that the room temperature thermopower is enhanced by a factor of more than 4 compared with that of monolayer graphene and gapless bilayer graphene [87]. A quite systematic study of multilayer graphene has shown that the largest thermopower is actually achieved in biased bilayer graphene [88]. Regarding the effect of bandgap, it is worth mentioning the work of Sharapov et al based on Kubo calculations showing that in certain conditions, a small bandgap of about 10 meV, e.g.…”

Section: Theory and Simulationmentioning

confidence: 99%

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Thermoelectric effects in graphene nanostructures

Dollfus

Nguyễn

Saint-Martin

2015

J. Phys.: Condens. Matter

171

139

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The thermoelectric properties of graphene and graphene nanostructures have recently attracted significant attention from the physics and engineering communities. In fundamental physics, the analysis of Seebeck and Nernst effects is very useful in elucidating some details of the electronic band structure of graphene that cannot be probed by conductance measurements alone, due in particular to the ambipolar nature of this gapless material. For applications in thermoelectric energy conversion, graphene has two major disadvantages. It is gapless, which leads to a small Seebeck coefficient due to the opposite contributions of electrons and holes, and it is an excellent thermal conductor. The thermoelectric figure of merit ZT of a two-dimensional (2D) graphene sheet is thus very limited. However, many works have demonstrated recently that appropriate nanostructuring and bandgap engineering of graphene can concomitantly strongly reduce the lattice thermal conductance and enhance the Seebeck coefficient without dramatically degrading the electronic conductance. Hence, in various graphene nanostructures, ZT has been predicted to be high enough to make them attractive for energy conversion. In this article, we review the main results obtained experimentally and theoretically on the thermoelectric properties of graphene and its nanostructures, emphasizing the physical effects that govern these properties. Beyond pure graphene structures, we discuss also the thermoelectric properties of some hybrid graphene structures, as graphane, layered carbon allotropes such as graphynes and graphdiynes, and graphene/hexagonal boron nitride heterostructures which offer new opportunities. Finally, we briefly review the recent activities on other atomically thin 2D semiconductors with finite bandgap, i.e. dichalcogenides and phosphorene, which have attracted great attention for various kinds of applications, including thermoelectrics.

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Section: Theory and Simulationmentioning

confidence: 99%

“…The thermopower of bilayer and multilayer graphene has been studied in different works [87][88][89][90]. Under a magnetic field, the disorder-induced broadening of Landau levels has been shown to have in bilayer graphene an effect similar to that in monolayer graphene.…”

Section: Theory and Simulationmentioning

confidence: 99%

Thermoelectric effects in graphene nanostructures

Dollfus

Nguyễn

Saint-Martin

2015

J. Phys.: Condens. Matter

171

139

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“…Model systems play a prominent role in Kohn-Sham (KS) 1 density functional theory (DFT) 2 , due to their utility in understanding and guiding the development of physically sound and accurate exchange-correlation (XC) functionals, which shall include quantum effects of the many-electron interaction. Thus, over the years, a wide number of model systems has been considered within DFT 1,[3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] .…”

Section: Introductionmentioning

confidence: 99%

Generalized Gradient Approximation Correlation Energy Functionals Based on the Uniform Electron Gas with Gap Model

Fabiano

Trevisanutto

Terentjevs

et al. 2014

J. Chem. Theory Comput.

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We studied uniform electron gas with a gap model in the context of density functional theory. On the basis of this analysis, we constructed two local gap models that are used in generalized gradient approximation (GGA) correlation functionals that satisfy numerous exact constraints for correlation energy. The first one, named GAPc, fulfills the full second-order correlation gradient expansion at any density regime and is very accurate for jellium surfaces, comparable to state-of-the-art GGAs for atomic systems and molecular systems, and is well compatible with known semilocal exchanges. The second functional, named GAPloc, satisfies the same exact conditions, except that the second-order gradient expansion is sacrificed for a better behavior under the Thomas-Fermi scaling and a more realistic correlation energy density of the helium atom. The GAPloc functional displays a high accuracy for atomic correlation energies, still preserving a reasonable behavior for jellium surfaces. Moreover, it shows a higher compatibility with the Hartree-Fock exchange than other semilocal correlation functionals. This feature is explained in terms of the real-space analysis of the GAPloc correlation energy.

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“…Zinc orthotitanate, Zn 2 TiO 4 (ZTO) has important physical, electrical and optical properties, has a good transmittance in visible light, and can be used for solar cell window electrode. ZTO has higher thermal stability than single metal oxide ZnO [6]. But now there is little research of ZTO as solar cell electrode.…”

Section: Introductionmentioning

confidence: 99%

Study of Nanocrystalline ZnO and Zn<sub>2</sub>TiO<sub>4</sub> Film Electrode with ZnPc Dye and PbS Quantum Dots Composite Sensitization

Wang

Zhang

Huo

et al. 2011

AMR

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Nanocrystalline ZnO and Zn2TiO4 porous film electrodes were prepared by sol-gel method and spin coating method, and the nanocrystalline porous films were characterized by XRD and SEM. Using ZnPc dye and PbS quantum dots as sensitizers. The nanocrystalline film electrodes of ZnO series and Zn2TiO4 series were prepared separately, and their absorption characteristics observed by UV-vis spectrophotometer. The results showed that ZnPc dye and PbS quantum dots could well sensitize the film electrodes, and the effect of ZnPc dye and PbS quantum dots composite sensitization was optimal. Then, the solar cells were fabricated. In simulation sunlight, the overall photoelectric conversion efficiency by Zn2TiO4/Q-PbS/ZnPc electrode increased by 22%, relative to the ZnO/Q-PbS/ZnPc electrode’s.

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Thermopower of multilayer graphene

Cited by 12 publications

References 66 publications

Thermoelectric effects in graphene nanostructures

Thermoelectric effects in graphene nanostructures

Generalized Gradient Approximation Correlation Energy Functionals Based on the Uniform Electron Gas with Gap Model

Study of Nanocrystalline ZnO and Zn<sub>2</sub>TiO<sub>4</sub> Film Electrode with ZnPc Dye and PbS Quantum Dots Composite Sensitization

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