|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications IX
||A Synergistic Approach to Boost the Thermoelectric Performance and Reduce the Thermal Conductivity in n-type PbTe : Carrier Optimization and Phase Diagram Engineering
||Ping-Yuan Deng, Kuang-Kuo Wang, Jia-Yu Du, Hsin-Jay Wu
|On-Site Speaker (Planned)
PbTe-based alloys with dopants have been the important mid-temperature thermoelectric (TE) materials since the 1960s. The breakthroughs for n-type PbTe are less impressive, which limits the overall conversion efficiency of a PbTe-based TE device. To overcome this obstacle, the electron-donor Gallium is incorporated with the PbTe, aiming to introduce the additional impurity traps within the bandgap. Additionally, the κL unveils a significant declining trend, accompanying with the defect evolution that transforming from a dislocation loop to nano-precipitation with increasing Ga content. The mechanism behind the κL reduction can be clarified by an equilibrium phase diagram, which opens up a new avenue for locating the high-zT TE materials. The synergy approach of carrier optimization and hierarchical architecturing rejuvenate the well-established TE materials and boost their performance to a higher record.