On the Challenges of Reducing Contact Resistances in Thermoelectric Generators Based on Half-Heusler Alloys

Hoang Ngan Pham, Ngo Van Nong, Thanh Hung Le, Benjamin Balke, Li Han, Ellen Marie Jensen Hedegaard, Søren Linderoth, Nini Pryds

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A method using fast hot pressing to join half-Heusler (HH) thermoelectric materials directly to an electrical current collector (Ag electrode) without using a third filler material is introduced. The compositions of the HH alloys used are Hf0.5Zr0.5CoSn0.2Sb0.8 and Ti0.6Hf0.4NiSn for p- and n-type, respectively. Using this method, the quality of the HH–electrode contacts is improved due to their low electrical contact resistance and less reaction– diffusion layer. The microstructure and chemical composition of the joints were examined using a scanning electron microscope equipped with energydispersive x-ray analysis. The electrical characteristics of the interfaces at the contacts were studied based on electrical contact resistance and Seebeck scanning microprobe measurements. In this paper, we show that joining the HH to a Ag electrode directly using fast hot pressing resulted in lower contact resistance and better performance compared with the method of using active brazing filler alloy.
Original languageEnglish
JournalJournal of Electronic Materials
Volume45
Issue number1
Pages (from-to)594-601
Number of pages8
ISSN0361-5235
DOIs
Publication statusPublished - 2016

Keywords

  • Thermoelectric
  • Thermoelectric generators
  • Half-Heusler
  • Contact
  • Joining
  • Energy conversion

Cite this

Pham, Hoang Ngan ; Van Nong, Ngo ; Le, Thanh Hung ; Balke, Benjamin ; Han, Li ; Jensen Hedegaard, Ellen Marie ; Linderoth, Søren ; Pryds, Nini. / On the Challenges of Reducing Contact Resistances in Thermoelectric Generators Based on Half-Heusler Alloys. In: Journal of Electronic Materials. 2016 ; Vol. 45, No. 1. pp. 594-601.
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title = "On the Challenges of Reducing Contact Resistances in Thermoelectric Generators Based on Half-Heusler Alloys",
abstract = "A method using fast hot pressing to join half-Heusler (HH) thermoelectric materials directly to an electrical current collector (Ag electrode) without using a third filler material is introduced. The compositions of the HH alloys used are Hf0.5Zr0.5CoSn0.2Sb0.8 and Ti0.6Hf0.4NiSn for p- and n-type, respectively. Using this method, the quality of the HH–electrode contacts is improved due to their low electrical contact resistance and less reaction– diffusion layer. The microstructure and chemical composition of the joints were examined using a scanning electron microscope equipped with energydispersive x-ray analysis. The electrical characteristics of the interfaces at the contacts were studied based on electrical contact resistance and Seebeck scanning microprobe measurements. In this paper, we show that joining the HH to a Ag electrode directly using fast hot pressing resulted in lower contact resistance and better performance compared with the method of using active brazing filler alloy.",
keywords = "Thermoelectric, Thermoelectric generators , Half-Heusler , Contact, Joining , Energy conversion",
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On the Challenges of Reducing Contact Resistances in Thermoelectric Generators Based on Half-Heusler Alloys. / Pham, Hoang Ngan; Van Nong, Ngo; Le, Thanh Hung; Balke, Benjamin; Han, Li; Jensen Hedegaard, Ellen Marie; Linderoth, Søren; Pryds, Nini.

In: Journal of Electronic Materials, Vol. 45, No. 1, 2016, p. 594-601.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - On the Challenges of Reducing Contact Resistances in Thermoelectric Generators Based on Half-Heusler Alloys

AU - Pham, Hoang Ngan

AU - Van Nong, Ngo

AU - Le, Thanh Hung

AU - Balke, Benjamin

AU - Han, Li

AU - Jensen Hedegaard, Ellen Marie

AU - Linderoth, Søren

AU - Pryds, Nini

PY - 2016

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AB - A method using fast hot pressing to join half-Heusler (HH) thermoelectric materials directly to an electrical current collector (Ag electrode) without using a third filler material is introduced. The compositions of the HH alloys used are Hf0.5Zr0.5CoSn0.2Sb0.8 and Ti0.6Hf0.4NiSn for p- and n-type, respectively. Using this method, the quality of the HH–electrode contacts is improved due to their low electrical contact resistance and less reaction– diffusion layer. The microstructure and chemical composition of the joints were examined using a scanning electron microscope equipped with energydispersive x-ray analysis. The electrical characteristics of the interfaces at the contacts were studied based on electrical contact resistance and Seebeck scanning microprobe measurements. In this paper, we show that joining the HH to a Ag electrode directly using fast hot pressing resulted in lower contact resistance and better performance compared with the method of using active brazing filler alloy.

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KW - Thermoelectric generators

KW - Half-Heusler

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KW - Joining

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