Gate-enhanced thermoelectric effects in all-carbon quantum devices

Liu, Y.S.; Shao, Xiaofei; Shao, Tianye; Zhang, J.Y.; Kuang, Yawei; Zhang, D.B.; Shao, Zhenguang; Yu, Hailin; Hong, Xiaodong; Feng, Jian; Yang, Xifeng; Chen, X.S.; Wang, X.F.

doi:10.1016/j.carbon.2016.08.014

Cited by 25 publications

(8 citation statements)

References 43 publications

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“…At this chemical potential, TP α and TP β are at their maximum with the opposite sign, which leads to signi cant TP S , unlike other chemical potentials. The obtained TP s value is comparable to reported values for graphene nanoribbon devices [34,47,50] and all-carbon molecular junctions [51][52][53]. Furthermore, this is higher than the maximum measured value of charge TP (460 µV/K) for graphene-fullerene TE nanodevice [29].…”

Section: Resultssupporting

confidence: 84%

Thermal magnetoresistance and spin thermopower in C₆₀ dimers

Shirdel-Havar

Farghadan²

2020

J. Phys.: Condens. Matter

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We theoretically investigate the spin-related thermoelectric properties in C 60 dimer bridged between zigzag graphene nanoribbon electrodes using the tight-binding model, equilibrium Green's function method, and Landauer-Büttiker transport formalism. By applying a thermal gradient, our proposed device could generate a notable spin thermopower. Moreover, by switching the magnetization of the electrodes, different spin currents, and giant thermal magnetoresistance (MR) can be achieved. Interestingly, various types of C 60 dimers also produce a thermal MR, which is sensitively modi ed by the gate voltages.

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Section: Resultssupporting

confidence: 84%

Thermal magnetoresistance and spin thermopower in C₆₀ dimers

Shirdel-Havar

Farghadan²

2020

J. Phys.: Condens. Matter

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“…Indeed, better TE performance can be achieved via the engineering of carbon allotropes and their derivatives, through a reduction in K ph [55] and/or a modification of the electronic band structure, hopefully without degrading the power factor GS 2 . The most important carbon allotrope is graphene, and the engineering strategies involve the production of GNR [56], graphene nanomeshs [57,58], graphene nanowiggles [59,60] (for example, Chevron-type GNRs [61]), carbon nanotubes [62], fullerenes [63], graphynes [64,65], and carbon quantum dots [66,67].…”

Section: Discussionmentioning

confidence: 99%

Thermoelectric transport properties of armchair graphene nanoribbon heterostructures

Almeida

Martins²

2022

J. Phys.: Condens. Matter

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In this paper, we numerically analyze the thermoelectric properties of recently synthesized graphene nanoribbon heterostructures that are obtained as extensions of pristine armchair graphene nanoribbons (AGNRs). After simulating their band structure through a nearest-neighbor tight-binding model, we use the Landauer formalism to calculate the necessary thermoelectric coefficients, with which we obtain the electrical conductance G, thermopower S, thermal conductance Ke, linear-response thermocurrent I_th=∆T = GS, and figure of merit ZT (using literature results for the phonon thermal conductance Kph), at room temperature. We then compare the results for the nanoribbon heterostructures with those for the pristine AGNR nanoribbons. The comparison shows that the metallic AGNRs become semiconducting (with much higher ZT values) after the inclusion of the extensions that transform them into heterostructures and that some heterostructures have higher values of ZT when compared to the semiconducting pristine AGNRs from which they have originated.

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“…Moreover, the strong boundary scattering in QDs can also reduce L substantially to even below that of alloys. In fact, excellent TE properties have been found or predicted for QDs of various materials [28,29], including carbon QDs [166,167]. Yan et al used the atomistic NEGF method to show that hexagonal graphene quantum dots, which can be viewed as a tiny piece of GNR constricted on both sides, can exhibit a ZT higher than that of pristine GNR [166].…”

Section: Carbon Quantum Dotsmentioning

confidence: 99%

“…Liu et al explored the TE properties of an all-carbon quantum device consisting of a graphene QD electrode and two zGNR electrodes using the NEGF method [167]. Specifically, the QD electrode is a zigzag-edged trigonal graphene, which was known to be ferromagnetic at ground state.…”

Section: Carbon Quantum Dotsmentioning

confidence: 99%

Carbon-Based Materials for Thermoelectrics

Chakraborty

Zahiri

et al. 2018

Advances in Condensed Matter Physics

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This article reviews the recent progress towards achieving carbon-based thermoelectric materials. A wide range of experimental and computational studies on carbon allotropes and composites is covered in this review paper. Specifically, we discuss the strategies for engineering graphene, graphene nanoribbon, graphene nanomesh, graphene nanowiggle, carbon nanotube (CNT), fullerene, graphyne, and carbon quantum dot for better thermoelectric performance. Moreover, we discuss the most recent advances in CNT/graphene-polymer composites and the related challenges and solutions. We also highlight the important charge and heat transfer mechanisms in carbon-based materials and state-of-the-art strategies for enhancing thermoelectric performance. Finally, we provide an outlook towards the future of carbon-based thermoelectrics.

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Gate-enhanced thermoelectric effects in all-carbon quantum devices

Cited by 25 publications

References 43 publications

Thermal magnetoresistance and spin thermopower in C₆₀ dimers

Thermal magnetoresistance and spin thermopower in C₆₀ dimers

Thermoelectric transport properties of armchair graphene nanoribbon heterostructures

Carbon-Based Materials for Thermoelectrics

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Gate-enhanced thermoelectric effects in all-carbon quantum devices

Cited by 25 publications

References 43 publications

Thermal magnetoresistance and spin thermopower in C60 dimers

Thermal magnetoresistance and spin thermopower in C60 dimers

Thermoelectric transport properties of armchair graphene nanoribbon heterostructures

Carbon-Based Materials for Thermoelectrics

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Thermal magnetoresistance and spin thermopower in C₆₀ dimers

Thermal magnetoresistance and spin thermopower in C₆₀ dimers