题 目：Thermal Energy Transport and Conversion in Nanostructures
The fundamental length scales associated with the basic heat carriers, such as phonons, electrons and photons, nerally fall in the range of 1-1000 nm. Therefore, exploring and exploiting basic nanoscale thermal transport and conversion phenomena hold the key for developing high performance materials and devices for thermal energy conversion and management. Despite the extensive research progress made in the past decade, some key issues still remain elusive. For example, what are the limits of charge and heat transport when the sizes of nanostructures are approaching the characteristic sizes of the energy carriers? How do we simultaneously reduce thermal conductivity and improve thermoelectric power factor in nanostructures for thermoelectric applications? In this presentation, I will discuss our recent work on using rationally designed nanostructures as well as advanced instrumentation to study thermal and thermoelectric transport phenomena in nanostructures in the confinement regime.
Prof. Renkun Chen received his B.S. degree in Thermo-physics from Tsinghua University in 2004, and Ph.D. degree in Mechanical Engineering from the University of California, Berkeley in 2008. Following a postdoctoral stint at Lawrence Berkeley National Laboratory, he became an assistant professor in the Department of Mechanical and Aerospace Engineering at UC San Diego in 2009. His research interests are in nanoscale heat transfer, thermoelectric materials and devices, and thermal management. He is a recipient of a R&D 100 award and a Hellman Faculty Fellow award.