About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Alloys and Compounds for Thermoelectric and Solar Cell Applications X
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Presentation Title |
Enhanced Thermoelectric Performance of n-type Silver Chalcogenide with Excess Ag
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Author(s) |
You-Cheng Du, Wan-Ting Yen, Hsin-Jay Wu |
On-Site Speaker (Planned) |
You-Cheng Du |
Abstract Scope |
The n-type silver chalcogenides (Ag2X, X= Se, Te) are ideal alternative to the bismuth-tellurides that are widely used for thermoelectric (TE) cooler. Comparing to the state-of-the-art bismuth tellurides, the silver chalcogenides comprise earth-abundant and low-toxic elements. The highly mobile silver ions in a silver-chalcogenide lattice could introduce various scale of defects that enhance the phonon scattering and reduce the lattice thermal conductivity. Single crystalline Ag2Se and Ag2Te were obtained from the Bridgman method while the excess Ag was introduced by sputtering. We found that the slightly off-stoichiometric silver chalcogenides yield dramatic change in the resultant transport properties. The excess Ag in our Ag2+xX crystals bring high power factors and enhanced peak figure-of-merit near the room-temperature region, making the n-type silver chalcogenides as ideal candidates for n-type TE cooler. |
Proceedings Inclusion? |
Planned: |