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Geometrically Enhanced Thermoelectric Effects in Graphene Nanoconstrictions

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Geometrically Enhanced Thermoelectric Effects in Graphene Nanoconstrictions. / Harzgeim, Achim; Spiece, Jean; Evangeli, Charalambos; McCann, Edward; Falko, Vladimir; Sheng, Yuewen; Warner, Jamie H.; Briggs, G. Andrew D.; Mol, Jan A.; Gehring, Pascal; Kolosov, Oleg Victor.

In: Nano Letters, Vol. 18, No. 12, 2018, p. 7719-7725.

Research output: Contribution to journalLetter

Harvard

Harzgeim, A, Spiece, J, Evangeli, C, McCann, E, Falko, V, Sheng, Y, Warner, JH, Briggs, GAD, Mol, JA, Gehring, P & Kolosov, OV 2018, 'Geometrically Enhanced Thermoelectric Effects in Graphene Nanoconstrictions', Nano Letters, vol. 18, no. 12, pp. 7719-7725. https://doi.org/10.1021/acs.nanolett.8b03406

APA

Harzgeim, A., Spiece, J., Evangeli, C., McCann, E., Falko, V., Sheng, Y., Warner, J. H., Briggs, G. A. D., Mol, J. A., Gehring, P., & Kolosov, O. V. (2018). Geometrically Enhanced Thermoelectric Effects in Graphene Nanoconstrictions. Nano Letters, 18(12), 7719-7725. https://doi.org/10.1021/acs.nanolett.8b03406

Vancouver

Author

Harzgeim, Achim ; Spiece, Jean ; Evangeli, Charalambos ; McCann, Edward ; Falko, Vladimir ; Sheng, Yuewen ; Warner, Jamie H. ; Briggs, G. Andrew D. ; Mol, Jan A. ; Gehring, Pascal ; Kolosov, Oleg Victor. / Geometrically Enhanced Thermoelectric Effects in Graphene Nanoconstrictions. In: Nano Letters. 2018 ; Vol. 18, No. 12. pp. 7719-7725.

Bibtex

@article{2577d5110dd346918df62251f881de73,
title = "Geometrically Enhanced Thermoelectric Effects in Graphene Nanoconstrictions",
abstract = "The influence of nanostructuring and quantum confinement on the thermoelectric properties of materials has been extensively studied. While this has made possible multiple breakthroughs in the achievable figure of merit, classical confinement, and its effect on the local Seebeck coefficient has mostly been neglected, as has the Peltier effect in general due to the complexity of measuring small temperature gradients locally. Here we report that reducing the width of a graphene channel to 100 nm changes the Seebeck coefficient by orders of magnitude. Using a scanning thermal microscope allows us to probe the local temperature of electrically contacted graphene two-terminal devices or to locally heat the sample. We show that constrictions in mono- and bilayer graphene facilitate a spatially correlated gradient in the Seebeck and Peltier coefficient, as evidenced by the pronounced thermovoltage Vth and heating/cooling response ΔTPeltier, respectively. This geometry dependent effect, which has not been reported previously in 2D materials, has important implications for measurements of patterned nanostructures in graphene and points to novel solutions for effective thermal management in electronic graphene devices or concepts for single material thermocouples.",
keywords = "SThM, Scanning thermal microscopy, scanning thermal gate microscopy, graphene, 2D materials, two-dimensional materials, themoelectrics, nanoscale heat transport, Scanning probe microscopy",
author = "Achim Harzgeim and Jean Spiece and Charalambos Evangeli and Edward McCann and Vladimir Falko and Yuewen Sheng and Warner, {Jamie H.} and Briggs, {G. Andrew D.} and Mol, {Jan A.} and Pascal Gehring and Kolosov, {Oleg Victor}",
year = "2018",
doi = "10.1021/acs.nanolett.8b03406",
language = "English",
volume = "18",
pages = "7719--7725",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "12",

}

RIS

TY - JOUR

T1 - Geometrically Enhanced Thermoelectric Effects in Graphene Nanoconstrictions

AU - Harzgeim, Achim

AU - Spiece, Jean

AU - Evangeli, Charalambos

AU - McCann, Edward

AU - Falko, Vladimir

AU - Sheng, Yuewen

AU - Warner, Jamie H.

AU - Briggs, G. Andrew D.

AU - Mol, Jan A.

AU - Gehring, Pascal

AU - Kolosov, Oleg Victor

PY - 2018

Y1 - 2018

N2 - The influence of nanostructuring and quantum confinement on the thermoelectric properties of materials has been extensively studied. While this has made possible multiple breakthroughs in the achievable figure of merit, classical confinement, and its effect on the local Seebeck coefficient has mostly been neglected, as has the Peltier effect in general due to the complexity of measuring small temperature gradients locally. Here we report that reducing the width of a graphene channel to 100 nm changes the Seebeck coefficient by orders of magnitude. Using a scanning thermal microscope allows us to probe the local temperature of electrically contacted graphene two-terminal devices or to locally heat the sample. We show that constrictions in mono- and bilayer graphene facilitate a spatially correlated gradient in the Seebeck and Peltier coefficient, as evidenced by the pronounced thermovoltage Vth and heating/cooling response ΔTPeltier, respectively. This geometry dependent effect, which has not been reported previously in 2D materials, has important implications for measurements of patterned nanostructures in graphene and points to novel solutions for effective thermal management in electronic graphene devices or concepts for single material thermocouples.

AB - The influence of nanostructuring and quantum confinement on the thermoelectric properties of materials has been extensively studied. While this has made possible multiple breakthroughs in the achievable figure of merit, classical confinement, and its effect on the local Seebeck coefficient has mostly been neglected, as has the Peltier effect in general due to the complexity of measuring small temperature gradients locally. Here we report that reducing the width of a graphene channel to 100 nm changes the Seebeck coefficient by orders of magnitude. Using a scanning thermal microscope allows us to probe the local temperature of electrically contacted graphene two-terminal devices or to locally heat the sample. We show that constrictions in mono- and bilayer graphene facilitate a spatially correlated gradient in the Seebeck and Peltier coefficient, as evidenced by the pronounced thermovoltage Vth and heating/cooling response ΔTPeltier, respectively. This geometry dependent effect, which has not been reported previously in 2D materials, has important implications for measurements of patterned nanostructures in graphene and points to novel solutions for effective thermal management in electronic graphene devices or concepts for single material thermocouples.

KW - SThM

KW - Scanning thermal microscopy

KW - scanning thermal gate microscopy

KW - graphene

KW - 2D materials

KW - two-dimensional materials

KW - themoelectrics

KW - nanoscale heat transport

KW - Scanning probe microscopy

U2 - 10.1021/acs.nanolett.8b03406

DO - 10.1021/acs.nanolett.8b03406

M3 - Letter

VL - 18

SP - 7719

EP - 7725

JO - Nano Letters

JF - Nano Letters

SN - 1530-6984

IS - 12

ER -