Guglielmo Lanzani, Center for Nano Science and Technology of IIT & Politecnico di Milano, Italy

Pump-probe spectroscopy is applied to several donor acceptor interfaces that are constituents of third generation solar cells. Following photoexcitation of the donor states or hybrid interface states this technique allows to track down the excitation path to a charge separated state or recombination. Parameters ruling interface dynamics, such as morphology, energy alignment or excess energy, are studied. In the talk evidence for hot state dissociation, occurring before vibrational relaxation, will be brought for the case of low band gap polymer/fullerene interface. Energy transfer in competition with charge transfer will be highlighted in standard P3HT/PCBM bulk heterojunction. Finally dynamics in hybrid systems, such as oxide/polymer will also be discussed.

Site web du groupe de Prof. Lanzani's

Cette conférence est présentée par le RQMP Versant Nord du Département de physique de l'Université de Montréal et le Département de génie physique de Polytechnique Montréal.