Abstract Scope |
Thermoelectric materials/devices can contribute to energy saving [1] and to power IoT applications [2]. Bismuth telluride has been the long-time champion thermoelectric near room temperature. Recently, magnesium antimonides are challenging this. In Mg3Sb2, minor Cu-doping in interstitial sites dramatically lowered phonon group velocity, while grain boundary doping promoted grain growth and optimum chemical composition leading to very high mobilities similar to single-crystals. An initial realistic 8-pair Mg-Sb type module exhibited efficiency of 7.3%@320oC, with developed materials actually indicating close to 11% [3]. Tuning toward room temperature yielded an initial 8-pair module with efficiency of 2.8%@100oC and Peltier cooling of 56.5 K, with materials performance higher [3]. I will present further improvements in the material & module development.
[1] T. Hendricks et al., Energies, 15, 7307 (2022).
[2] T. Mori, S. Priya, MRS Bulletin 43, 176 (2018).
[3] Z. Liu et al., Joule, 5, 1196-1208 (2021), Nature Commun. 13, 1120 (2022). |