Energy Transport and Dissipation at the Nanoscale

Departments: Mechanical Engineering and Materials Science
Time: Wednesday, February 1, 2017 - 2:30pm - 3:30pm
Type: Seminar Series
Presenter: Woochul Lee; Postdoctoral Fellow, University of California, Berkeley, Lawrence Berkeley National Laboratory
Room/Office: Room 107
Location:
Mason Lab
9 Hillhouse Avenue
New Haven, CT 06511
United States
See map: Google Maps

Department of Mechanical Engineering and Materials Science Seminar Series

"Energy Transport and Dissipation at the Nanoscale"
Dr. Woochul Lee
Postdoctoral Fellow
University of California, Berkeley
Lawrence Berkeley National Laboratory

Energy transport and dissipation at the nanoscale differs fundamentally from that at the bulk scale. Characterization and understanding of the unique energy transport and dissipation phenomena that arise at the nanoscale is key to developing novel technological applications such as energy conversion devices, converting heat to electricity, and atomic-scale device components. In this talk, I will describe experimental tools and techniques that I developed to enable unique experiments for accessing nanoscale energy transport and dissipation characteristics. I will discuss energy dissipation in atomic-scale junctions that are composed of single atomic chains or single molecules, where quantum transport is dominant. I will also describe a framework for understanding heat dissipation in a range of atomic and nanoscale devices. Subsequently, I will discuss energy transport properties in all-inorganic halide perovskite nanowires. I will present a recent discovery of ultralow thermal conductivity in all-inorganic halide perovskite nanowires and describe the mechanisms of thermal transport in this novel class of materials. Lastly, I will discuss unique combinations of ultralow thermal conductivity and high electrical conductivity in Pb-free Sn based all-inorganic perovskite for a thermoelectric energy conversion application.

Bio: Dr. Woochul Lee is a postdoctoral fellow at UC Berkeley and Lawrence Berkeley National Lab, working in the research groups of Prof. Peidong Yang and Dr. Jeff Urban. He received his M.S. and Ph.D. in Mechanical Engineering at the University of Michigan in 2010 and 2014, respectively, under the guidance of Prof. Pramod Reddy. He received his B.S. in Mechanical Engineering at Yonsei University, Korea in 2008. He is a recipient of Best Poster Award in all categories at 2013 ASME IMECE Society-Wide Micro and Nanotechnology Forum and 1st Place Award in Nanotechnology & Microfabricated Systems at Engineering Graduate Symposium at the University of Michigan.

Host: Udo Schwarz
Wednesday, February 1, 2017
Mason Lab 107
2:30pm - 3:30pm
Refreshments 2:15pm