Nonequilibrium Dynamics in Colloidal Semiconductor Nanomaterials

Colloquium: Chem. & Biomol. Engineering Colloquium | September 12 | 4-6 p.m. | 180 Tan Hall

 William A. Tisdale, Massachusetts Institute of Technology

 Department of Chemical Engineering

Structure, surface chemistry, and energetic disorder can dramatically affect excited state dynamics in low-dimensional systems. Using a combination of ultrafast laser spectroscopy, time-resolved optical microscopy, and kinetic modeling, I will show how these effects manifest in assemblies of colloidal quantum dots (QD) and atomically thin 2D semiconductors, which are promising components of next-generation photovoltaic and lighting technologies. In particular, I will demonstrate the counterintuitive role of entropy in the nonequilibrium population dynamics of excitons and charge carriers in nanoscale systems.

 CA, irisoacosta@berkeley.edu