Understanding the Generation of Charge Carriers in Organic Photovoltaics
Published on Nov 5, 2012
A plenary talk from SPIE Optics + Photonics 2012. http://spie.org/op
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.