Topic: Order-disorder structural design and performance control of thermoelectric materials

Time: 13: 00-15: 00, October 22

Venue: Room 203, Building 15

Chaired by: Qiu Wu, Associate Research Fellow

About the reporter:

Zhao Kun-peng is a researcher at the School of Materials Science and Engineering, Shanghai Jiao Tong University. He received his bachelor's degree from Xiamen University in 2012, received his doctorate from the Shanghai Institute of Silicate under the Chinese Academy of Sciences in 2018, and joined the School of Materials at Shanghai Jiao Tong University in the same year. He is mainly engaged in the design and synthesis of new thermoelectric materials, the regulation of electron and phonon transport, and the exploration and development of new disordered / plastic semiconductors. He has published more than 80 papers in Nat. Commun. (3), Sci. Adv., Mater. (3), Joule, Energy Environ. Sci. (3), and applied for eight invention patents. He was awarded the Golden Smid Award of the 37th International Thermoelectric Society and the Excellent Young Scientist Award 2024 of the Thermoelectric Division, and served as the Young Editor of Energy Materials and Devices and Rare Metals. He has presided over the National Natural Science Foundation of China for Excellent Young People, General Science Foundation, Youth Foundation, and the Sailing Program for Young Science and Technology Talents in Shanghai.

Introduction to lecture:

The order-disordered structure thermoelectric materials h**e low thermal conductivity like glasses and excellent electrical properties of crystals, However, that influence mechanism of order-disorder structure on the phase is unclear, the electric transport model and mechanism of critical phase transition are absent, and the optimization of electric transport is limited to the band edge. In this report, the team's work on order-disorder structural design and performance regulation of thermoelectric materials will be described: A quantitative model of critical electrical transport properties will be established, The influence mechanism of band broadening and phonon soft mode on electric transport properties is revealed, and a new kind of phase beyond Hume-Rothery law is found, In addition, that order occupation of anions and the disorder occupation of cations / large atom vibration together result in glass-crystal duality; the degree of structural disorder and the fermi level are controlled by adaptive sublattices and multi-level functional units, The regulation mechanism of thermoelectric properties extends from the band edge to the mobility edge.