| Abstract Scope |
We have developed novel mechanisms to lower thermal conductivity. Minute Cu doping in Mg3Sb2 resulted in interstitial doping which especially scattered phonons, leading to high conversion efficiency rivalling the best Bi2Te3-type modules [1]. The simple crystallographic parameter, partial occupancy was demonstrated to be an effective indicator to identify a new material catalogue with low thermal conductivity [2]. Electronic properties tuning resulted in very high ZT for a sulfide. Particular doping into SnTe was shown to lead to softening of the lattice, and a dramatic reduction of thermal conductivity largely exceeding the contribution from phonon scattering, resulting in a particularly high ZTav [3]. Heterogeneous bonding in mixed anion compounds was demonstrated to result in exceptionally low thermal conductivity [4].
[1] Joule, 5, 1196 (2021), Nature Commun. 13, 1120 (2022).
[2] Energy Environ. Sci., 14, 3579 (2021).
[3] Adv. Energy Mater., 11, 2101122 (2021).
[4] J. Mater. Chem. A, 9, 22660 (2021). |