Prof. Randy J. Ellingson
Associate Professor, Department of Physics and Astronomy
Faculty Member, Wright Center for Photovoltaic Innovation and Commercialization (PVIC)

School for Solar and Advanced Renewable Energy, College of Natural Sciences and Mathematics
The University of Toledo
Toledo, OH 43606
Randy J. Ellingson B.A. Physics, Carleton College, 1987
Ph.D. Applied Physics, Cornell University, 1994

Research interests: Understanding the dynamics and mechanisms of energy loss for electrons, holes, and excitons in nanoscale light absorbers and their assemblies, for application to solar energy conversion. Advancing assembly methods to use solution-based colloidal semiconductor nanocrystals for thin-film solar cells.


Ultrafast Laser Spectroscopy of Nano- and Molecular-Scale Absorbers


The Ellingson Group is interested in ultrafast charge carrier processes in colloidal semiconductor nanocrystals, molecular absorbers such as single-wall carbon nanotubes (SWNTs) and organic photovoltaic components, and assemblies such as nanocrystal arrays formed through self-assembly routes. We utilize a variety of time-resolved laser spectroscopy techniques such as pump-probe (transient absorption) and time-resolved photoluminescence to understand charge carrier dynamics as well as exciton transport processes.


Assembling colloidal semiconductor nanocrystals for use in highly-efficient, inexpensive photovoltaics


The Ellingson Group is also interested in the assembly of colloidal semiconductor nanocrystals for use in simple solar cells with the potential for highly-efficient operation. A variety of inorganic semiconductors are of interest, especially those which utilize abundant, inexpensive elements such as Cu, Zn, Sn, S, Fe, and Si.