Events

Exploring Competing Kinetic Processes in Quantum Dots Linked to Electrode Surfaces

March 14, 2012 at 2:30pm/4-349

Mark Hybertsen
Brookhaven National Laboratory, Columbia University

Abstract:
Exploiting the unique properties of nanostructured chromophores for light harvesting applications relies on the balance between competing kinetic processes including energy transfer, carrier relaxation and carrier tunneling. In the first part of this talk, I will describe a microscopic approach to understand these processes in quantum dots coupled to an electrode. Control of the carrier tunneling rate is one of the key processes that may be explicitly tuned by use of chemical linkages. In the second part of this talk, I will describe the role of link chemistry in controlling through bond tunneling rates. These trends are based on measurements and calculations of the conductance through single molecule junctions.

Bio:
Mark S. Hybertsen holds a BA in Physics from Reed College in Portland, OR (1980) and a PhD in Physics from The University of California, Berkeley (1986). Dr. Hybertsen joined Bell Laboratories in 1986, pursuing research projects in the theory of the electronic properties of materials (bulk semiconductors, semiconductor surfaces and interfaces, cuprates, porous silicon, optoelectronic device physics). He supervised the Device and Materials Physics Group in the Semiconductor Photonics Research Department for four years. From 2003 to 2006, Dr. Hybertsen was a Senior Research Scientist in the Department of Applied Physics and Applied Mathematics at Columbia University in New York, where he has also been an Adjunct Professor in the Department of Electrical Engineering. In 2006, Dr. Hybertsen joined the new Center for Functional Nanomaterials at Brookhaven National Laboratory where he leads the Theory and Computation Group. He also maintains an adjunct research appointment at Columbia University. Dr. Hybertsen is a fellow of the American Physical Society and a member of the IEEE and the American Chemical Society.