Daniel Hannah (Extra SIMES Seminar)

Date(s) - Jan 15 2015
2:00 PM - 3:00 PM

Shasta Room, Bldg. 40, Room 361


 Spectroscopic Characterization of Phonon Generation and Transport in Semiconductor Nanocrystals

Daniel Hannah

Dept. of Chemistry, Northwestern University

Intraband carrier relaxation is a major energy loss and heat generation mechanism in semiconductors, but a complete picture of this process in semiconductor nanocrystals (SNCs) has remained elusive.  Studying the subsequent transport of generated heat also presents unique challenges related to the prevalence of interfacial scattering at nanometer length scales.  In this presentation I will describe our utilization of femtosecond stimulated Raman spectroscopy to monitor phonon populations in real-time during intraband carrier cooling in SNCs.  I will also discuss an optical signature of thermal transport which enables the characterization of thermal transport rates in matrix-embedded SNCs using time-resolved photoluminescence spectroscopy.