The Importance of 3D Topological Insulators for Thermoelectric Applications and Why We Need a Green Topological Insulator

The Importance of 3D Topological Insulators for Thermoelectric Applications and Why We Need a Green Topological Insulator

Presenter

  • Kornelius Nielsch, Leibnitz Institute of Solid State and Materials, Dresden, Germany
October 3, 2017 - 10:30am to 11:30am

Abstract 

In this presentation we challenge the interconnection between thermoelectric performance and the topological insulator nature of chalcogenide-type materials. While topological surface states seem to play a minor role in the thermoelectric transport in nanograined bulk materials, it will be shown that they severely contribute to the transport in nanostructures due to their high surface-to-volume ratio. For thermoelectric conversion processes near room temperature and up to 200°C, Bi2Te3 and related materials are the dominating materials for devices, and many attempts to replace this material class have failed. For decades it was known that heavy elements efficiently damp phonons. In the past 5 years we have learned that Bi2Te3 and Bi2Se3, due to strongly spin-orbit coupling, exhibit topical surface states and are 3D topological insulators. That finding has stimulated the research on novel materials such as SnSe, which exhibit topological surface states.

Additional Information 

About the Speaker:

Dr. Kornelius Nielsch is the director of the institute of Metallic Materials at IFW Dresden and a full professor at TU Dresden.

Sponsoring Organization 

Materials Science and Technology Division

Location

  • Chemical and Materials Sciences Building
  • Building: 4100
  • Room: J-302

Contact Information

Share