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 with High Thermal Stability in Cu-based n-type PbTe |
Author(s) |
Ping-Yuan Deng, Hsin-Jay Wu, Kung-Kuo Wang |
On-Site Speaker (Planned) |
Ping-Yuan Deng |
Abstract Scope |
Lead-tellurides have been the well-established mid-temperature thermoelectric (TE) materials since the 1960s. Nevertheless, the conversion efficiency of the n-type PbTe has a lower TE still has room to improve. Incorporation of Cu in PbTe not only brings the n-type conduction but elevates the power factor as a result of enhancing carrier mobility. The largest drawback for the Cu-doped PbTe arises from the mobile Cu, especially under activation of the electrical current. The electromigration effect caused by Cu in PbTe could deteriorate the TE performance, falling to meet satisfactory thermal stability after cycling. Benefited from lightly Cu doping and VIA-element alloying, the Cu0.012M0.006(PbTe)0.988 (M = VIA elements) exhibits a peak zT ~ 1.5 at 598 K with high thermal stability between the temperature range of 300 – 598 K after multiple thermal cycling. The co-existence of interstitial-Cu and VIA nano-precipitate maintain the large carrier mobility with a reduced kL. |
Proceedings Inclusion? |
Planned: |
Keywords |
Energy Conversion and Storage, |