Enhanced thermoelectric properties in Bi/Te core/shell heterostructure nanowires through strain and interface engineering

Jeongmin Kim; Gwansik Kim; Je Hyeong Bahk; Jin Seo Noh; Wooyoung Lee

doi:10.1016/j.nanoen.2017.01.017

Enhanced thermoelectric properties in Bi/Te core/shell heterostructure nanowires through strain and interface engineering

Jeongmin Kim, Gwansik Kim, Je Hyeong Bahk, Jin Seo Noh, Wooyoung Lee

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

Strain-engineered Bi/Te core/shell (C/S) nanowires (NWs) with various diameters were prepared by combining the on-film formation of NWs method with post-sputtering. Multiple devices were fabricated based on individual C/S NWs. The diameter-dependent electrical conductivity (σ), Seebeck coefficient (S), and thermal conductivity (κ) of the Bi/Te C/S NWs were systematically investigated. S and σ were found to increase with increasing NW diameter until they maximized at diameters exceeding 400 nm. Together with the reduction in κ, this generated a maximum thermoelectric figure of merit of 0.5 for a relatively large-diameter Bi/Te C/S NW (d=456 nm) at room temperature. These results suggest that the C/S NW structure could be used to modify the thermoelectric performance of materials, as the figure of merit was significantly greater than previously reported values for pure Bi NWs (0.07) and bulk Bi (0.05). Furthermore, the enhanced performance of very large Bi/Te C/S NWs demonstrated the possibility of designing heterostructures that can be used in thermoelectric device and module applications.

Original language	English
Pages (from-to)	520-525
Number of pages	6
Journal	Nano Energy
Volume	32
DOIs	https://doi.org/10.1016/j.nanoen.2017.01.017
Publication status	Published - 2017 Feb 1

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIP) (2014R1A2A1A10053869) and the Priority Research Centers Program (2009-0093823).

Publisher Copyright:
© 2017

All Science Journal Classification (ASJC) codes

Renewable Energy, Sustainability and the Environment
Materials Science(all)
Electrical and Electronic Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.nanoen.2017.01.017

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title = "Enhanced thermoelectric properties in Bi/Te core/shell heterostructure nanowires through strain and interface engineering",

abstract = "Strain-engineered Bi/Te core/shell (C/S) nanowires (NWs) with various diameters were prepared by combining the on-film formation of NWs method with post-sputtering. Multiple devices were fabricated based on individual C/S NWs. The diameter-dependent electrical conductivity (σ), Seebeck coefficient (S), and thermal conductivity (κ) of the Bi/Te C/S NWs were systematically investigated. S and σ were found to increase with increasing NW diameter until they maximized at diameters exceeding 400 nm. Together with the reduction in κ, this generated a maximum thermoelectric figure of merit of 0.5 for a relatively large-diameter Bi/Te C/S NW (d=456 nm) at room temperature. These results suggest that the C/S NW structure could be used to modify the thermoelectric performance of materials, as the figure of merit was significantly greater than previously reported values for pure Bi NWs (0.07) and bulk Bi (0.05). Furthermore, the enhanced performance of very large Bi/Te C/S NWs demonstrated the possibility of designing heterostructures that can be used in thermoelectric device and module applications.",

author = "Jeongmin Kim and Gwansik Kim and Bahk, {Je Hyeong} and Noh, {Jin Seo} and Wooyoung Lee",

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AU - Noh, Jin Seo

AU - Lee, Wooyoung

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N2 - Strain-engineered Bi/Te core/shell (C/S) nanowires (NWs) with various diameters were prepared by combining the on-film formation of NWs method with post-sputtering. Multiple devices were fabricated based on individual C/S NWs. The diameter-dependent electrical conductivity (σ), Seebeck coefficient (S), and thermal conductivity (κ) of the Bi/Te C/S NWs were systematically investigated. S and σ were found to increase with increasing NW diameter until they maximized at diameters exceeding 400 nm. Together with the reduction in κ, this generated a maximum thermoelectric figure of merit of 0.5 for a relatively large-diameter Bi/Te C/S NW (d=456 nm) at room temperature. These results suggest that the C/S NW structure could be used to modify the thermoelectric performance of materials, as the figure of merit was significantly greater than previously reported values for pure Bi NWs (0.07) and bulk Bi (0.05). Furthermore, the enhanced performance of very large Bi/Te C/S NWs demonstrated the possibility of designing heterostructures that can be used in thermoelectric device and module applications.

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Enhanced thermoelectric properties in Bi/Te core/shell heterostructure nanowires through strain and interface engineering

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

UN SDGs

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