This presentation discusses an alternative approach to understanding the important charge-generation step that is critical to operation of an organic photovoltaic device. Instead of considering the interface to be a simple interaction between two semiconductors, a molecular model is discussed. The model takes advantage of the many years of studying photo-induced electron transfer in model donor-acceptor systems, where the process of long-lived charge separation and inhibited recombination process are well known and can be described by a Marcus Formulation. A number of polymer:fullerene systems have been studied, each with differing Gibbs energy driving forces and reorganization energies for electron transfer. The talk examines implications of the findings on improving device performance.
Garry Rumbles is a Research Fellow at the U.S. DOE National Renewable Energy Laboratory (NREL). He joined NREL in 2000 and is widely recognized for his research in photochemistry and photophysics of conjugated molecular systems, energy conversion in organic light emitting diodes and organic photovoltaic devices, and nanoscale morphology. He is a Professor Adjoint in the Department of Chemistry and Biochemistry at CU Boulder; and in 2009 he became a Fellow of the joint CU/NREL adventure: Renewable and Sustainable Energy Institute (RASEI). In 2004, he was made a Fellow of the Royal Society of Chemistry.