Suppressing Thermal Conductivity in SrTiO3 by Introducing Oxygen Isotope Disorder

• DOI: 10.1021/acs.jpclett.4c03034
• Publication Date: 2025-02-13T16:04:03Z
• Authors: Yipeng Zang; Zhiming Geng; Chen Di; Ningchong Zheng; Xinwei Fang; Xuejun Yan; Zhengbin Gu; Pol Torres; Jorge Íñiguez-Gon...; Rong Huang; Fangsen Li; Riccardo Rurali; Yanfeng Chen; Xiaoqing Pan; Minghui Lu; Shouguo Wang; Yuefeng Nie

Transition metal oxides are promising candidates in the field of thermoelectricity, which can convert heat and electricity into each other realize efficient utilization waste energy. For figure merit ZT = S2σT/(κe + κl), a lower thermal conductivity is desired for an enhanced ZT, cation doping appropriate way to regulate transport properties. However, because S, σ, κe strongly coupled with other, one parameter modification generate compensation others, making regulation more difficult. In this work, we demonstrate effective engineering SrTiO3 films by partial oxygen isotope substitution 18O using straightforward aftergrowth annealing process. The results show that disorder promotes scattering phonons generates nearly 20% decreased films. Our work provides convenient new route design thermoelectric materials high values.