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*FYI--The date has been changed to May 17th, 2013.*


On 3/15/2013 9:15 AM, Jennifer Keddle wrote:
>
> MichiganState University
>
> Science at the Edge
>
> Engineering Seminar
>
> *May 17, 2013*
>
> 11:30 a.m.
>
> Room1400 Biomedical and Physical Sciences Building
>
> Refreshments served at 11:15 a.m.
>
> Mark E. Thompson
>
> Department of Chemistry
>
> University of Southern California
>
>
>   Exciton Management in Organic Solar Cells
>
> **
>
> Abstract
>
> The exciton is a critical part of each of the processes leading to 
> photocurrents in Organic PhotoVoltaics (OPVs), and being able to 
> control the location, lifetime and energy of the exciton is essential 
> to achieving high efficiency.We have investigated methods for tuning 
> exciton energies and controlling their migration paths, both 
> intramolecularly and within a thin film.I will discuss our most recent 
> work with both organic dyes, such as squaraines and dipyrrins as well 
> as porphyrinic materials for OPVs.This involves a careful materials 
> design study that leads to both low energy absorption (into the 
> nearIR) and the efficient use of multiple absorbers to efficiently 
> harvest photons through the entire visible spectrum.To that end we 
> have used transient absorption spectroscopy and measured the rates of 
> singlet and triplet energy transfers between organic dyes (BODIPY and 
> tetracenes).Both intra- and inter-molecular energy transfers take 
> place on the picoseconds time scale.Thus, the systems are fully 
> equilibrated into the lowest energy triplet state(s) before 
> nonradiative decay.Using this approach we can efficiently harvest 
> energy across the visible and into the NIR. I will also discuss our 
> latest results with new singlet fission materials for efficient light 
> harvesting in OPVs. Our control of singlet and triplet excitons has 
> been important in exploring the use of singlet fission to enhance the 
> efficiencies of OPVs.
>
> Bio
>
> */Dr. Mark E. Thompson/*is Professor of Chemistry and Materials 
> Science at the University of Southern California. He received his B.S. 
> degree in Chemistry in 1980 (U.C. Berkeley) and his Ph.D. in chemistry 
> in 1985 (California Institute of Technology).He spent 2 years as a 
> postdoctoral fellow in the Inorganic Chemistry laboratory at Oxford 
> University.Prof. Thompson took a position in the chemistry department 
> at Princeton University in 1987, as an assistant professor.In 1995 he 
> moved his research team to the University of Southern California, 
> where he is currently a Professor of Chemistry.He has won a number of 
> awards, including the MRS Medal in 2006, given by the Materials 
> Research Society, and the Jan Rachman Prize for Outstanding 
> Achievement in Flat Panel Displays, also in 2006, given by the Society 
> for Information Display. In 2011 he was named the 12 of the top 100 
> most influential chemists in the world by Thomson-Rueters.In 2012 he 
> was received the Alexander von Humboldt Research Award.He currently 
> has over 250 papers in print and over 125 US patents.His research 
> interests involve the optical and optoelectronic properties of 
> molecular materials and devices, particularly organic LEDs and solar 
> cells, as well as nanoscale materials, catalysis and biosensors.
>
> For further information please contact Prof. Christina Chan, 
> Department of Chemical Engineering and Materials Science at 
> [log in to unmask] <mailto:[log in to unmask]>
>
> Persons with disabilities have the right to request and receive 
> reasonable accommodation. Please call the Department of Chemical 
> Engineering and Materials Science at 355-5135 at least one day prior 
> to the seminar; requests received after this date will be met when 
> possible.
>