Abstract Scope |
Modulation of phonon transport in solid materials plays a crucial role in achieving heat flow control and efficient thermoelectric conversion. Thermal gradient across a thermoelectric material is a driving force of conversion from heat to electricity, and thus the achiving low thermal conductivity (κ) is required for realizing high thermoelectric conversion efficiency (ZT). In addition, if a material can change κ largely by external stimuli, it is possible to control heat flow in a solid. Since thermal conduction is closely related to lattice viblation, designing and modulating the crystalline lattice would be an effective way to modulate the material's κ. Here, I introduce new design routes for κ reduction of transition metal oxide, SrTiO3 by hydride anion (H–) substitution [X. He et al., Adv. Funct. Mater. 2213144 (2023).] and large κ modulation in (Pb1-xSnx)Se by the crystal-structure dimensionality switch [Y. Nishimura et al., Adv. Electron. Mater. 8, 2200024 (2022).]. |