Journal article
On the Challenges of Reducing Contact Resistances in Thermoelectric Generators Based on Half-Heusler Alloys
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.
| Language: | English |
|---|---|
| Publisher: | Springer US |
| Year: | 2016 |
| Pages: | 594-601 |
| ISSN: | 1543186x and 03615235 |
| Types: | Journal article |
| DOI: | 10.1007/s11664-015-4156-z |
| ORCIDs: | Van Nong, Ngo , Le, Thanh Hung , Han, Li , Linderoth, Søren and Pryds, Nini |
COPPER Characterization and Evaluation of Materials Chemistry and Materials Science Electronics and Microelectronics, Instrumentation FE2VAL HIGH-EFFICIENCY MODULE Material Science Optical and Electronic Materials PERFORMANCE PHASE-SEPARATION SILVER SYSTEM Solid State Physics contact energy conversion half-Heusler joining thermoelectric generators
