报告题目：Thermoelectrics:Contraindication & Resolution

报告人：David J.Singh，密苏里大学 教授

报告时间：2023年11月10日 10:00

报告地点：吉林大学中心校区唐敖庆楼B521报告厅

报告简介

　　Thermoelectric materials are important for spacecraft power, waste heat recovery, thermal management and cooling applications. Here I discuss the basic physics of thermoelectric effects and approaches for discovering new thermoelectric materials. A key issue is the contraindication of high thermoelectric performance, which places thermoelectrics into an interesting group of materials that includes transparent conductors, magnetic semiconductors and multiferroics. The efficiency of thermoelectric systems is limited by materials performance. This is measured by the figure of merit ZT=sS²T/k, where S is the thermopower and the other symbols have their usual meaning. ZT is therefore a composite property involving electronic and thermal transport, with high ZT favored by high conductivity, high thermopower and low thermal conductivity. However, these properties are inter-related, often to the detriment of high ZT. This counter-indication leads to several interesting connections, such as between thermoelectrics and topological insulators and between thermoelectrics and high-performance ferroelectrics. This talk discusses these correlations, and points out ways to overcome them. In particular, several measures that can be used to characterize materials as potential thermoelectrics are discussed.

报告人简介

　　David J. Singh is an expert on first principles methods and their use to unravel complex properties of materials, particularly quantum materials, thermoelectrics and superconductors. He is Curators’ Distinguished Professor, University of Missouri (Emeritus, Pending), and was previously a Corporate Fellow at Oak Ridge National Laboratory and a Section Head at the U.S. Naval Research Laboratory. He is a Fellow of the American Physical Society and the Royal Society of Chemistry. He has published more than 700 scientific papers with more than 60,000 citations and an h-index of 96. He is the recipient of the Gordon-Batelle Prize, the Charles Hatchett Award and the E.O. Hulburt Award.

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物质模拟方法与软件教育部重点实验室

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