Contribution of radial dopant concentration to the thermoelectric properties of core-shell nanowires

Julio A. Martinez; Jeong Hyun Cho; Xiaohua Liu; Ting S. Luk; Jianyu Huang; S. T. Picraux; John P. Sullivan; B. S. Swartzentruber

doi:10.1063/1.4794821

Contribution of radial dopant concentration to the thermoelectric properties of core-shell nanowires

Julio A. Martinez, Jeong Hyun Cho, Xiaohua Liu, Ting S. Luk, Jianyu Huang, S. T. Picraux, John P. Sullivan, B. S. Swartzentruber

Electrical and Computer Engineering

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Abstract

We report the thermoelectric characteristics of core-shell p-type germanium nanowires (GeNWs) (lightly doped core, heavily doped shell). Overall, the thermoelectric characteristics are dominated by the heavily doped shell. Experimental data indicate that surface states produce dopant deactivation when the heavily doped shell is removed. Under this situation, the thermoelectric figure of merit is degraded. Etching the heavily doped shell resulted in a rough germanium nanowire with a thermal conductivity close to 1.1 W/m-K at 300 K, which is one of the smallest k measured for nanowires and comparable to the thermal conductivity of bulk SiO₂.

Original language	English (US)
Article number	103101
Journal	Applied Physics Letters
Volume	102
Issue number	10
DOIs	https://doi.org/10.1063/1.4794821
State	Published - Mar 11 2013

Bibliographical note

Funding Information:
This work was performed at the Center for Integrated Nanotechnologies, a U.S. Department of Energy, Office of Basic Energy Sciences user facility at Los Alamos National Laboratory (Contract DE-AC52-06NA25396) and Sandia National Laboratories (Contract DE-AC04-94AL85000).

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abstract = "We report the thermoelectric characteristics of core-shell p-type germanium nanowires (GeNWs) (lightly doped core, heavily doped shell). Overall, the thermoelectric characteristics are dominated by the heavily doped shell. Experimental data indicate that surface states produce dopant deactivation when the heavily doped shell is removed. Under this situation, the thermoelectric figure of merit is degraded. Etching the heavily doped shell resulted in a rough germanium nanowire with a thermal conductivity close to 1.1 W/m-K at 300 K, which is one of the smallest k measured for nanowires and comparable to the thermal conductivity of bulk SiO2.",

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note = "Funding Information: This work was performed at the Center for Integrated Nanotechnologies, a U.S. Department of Energy, Office of Basic Energy Sciences user facility at Los Alamos National Laboratory (Contract DE-AC52-06NA25396) and Sandia National Laboratories (Contract DE-AC04-94AL85000).",

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AU - Martinez, Julio A.

AU - Cho, Jeong Hyun

AU - Liu, Xiaohua

AU - Luk, Ting S.

AU - Huang, Jianyu

AU - Picraux, S. T.

AU - Sullivan, John P.

AU - Swartzentruber, B. S.

N1 - Funding Information: This work was performed at the Center for Integrated Nanotechnologies, a U.S. Department of Energy, Office of Basic Energy Sciences user facility at Los Alamos National Laboratory (Contract DE-AC52-06NA25396) and Sandia National Laboratories (Contract DE-AC04-94AL85000).

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N2 - We report the thermoelectric characteristics of core-shell p-type germanium nanowires (GeNWs) (lightly doped core, heavily doped shell). Overall, the thermoelectric characteristics are dominated by the heavily doped shell. Experimental data indicate that surface states produce dopant deactivation when the heavily doped shell is removed. Under this situation, the thermoelectric figure of merit is degraded. Etching the heavily doped shell resulted in a rough germanium nanowire with a thermal conductivity close to 1.1 W/m-K at 300 K, which is one of the smallest k measured for nanowires and comparable to the thermal conductivity of bulk SiO2.

AB - We report the thermoelectric characteristics of core-shell p-type germanium nanowires (GeNWs) (lightly doped core, heavily doped shell). Overall, the thermoelectric characteristics are dominated by the heavily doped shell. Experimental data indicate that surface states produce dopant deactivation when the heavily doped shell is removed. Under this situation, the thermoelectric figure of merit is degraded. Etching the heavily doped shell resulted in a rough germanium nanowire with a thermal conductivity close to 1.1 W/m-K at 300 K, which is one of the smallest k measured for nanowires and comparable to the thermal conductivity of bulk SiO2.

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Contribution of radial dopant concentration to the thermoelectric properties of core-shell nanowires

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