The photophysics of charge generation and separation in an organic photovoltaic blend
Organic photovoltaic (OPV) devices manufactured with an active layer of conjugated polymer blended with carbon fullerene derivatives are highly efficient, with power conversion efficiencies exceeding 10 percent. Despite this, understanding of the photophysics of these devices has lagged behind development of materials and device structures.
In this talk I will present the results of ultrafast spectroscopy measurements performed on films of the polymer PTB7 blended with the functionalized fullerene PC70BM. From these results we observe the effects of the solvent additive diiodooctane on charge separation in this blend, and gain a broader insight as to the role of fullerene aggregation on charge delocalisation and device efficiency for OPV blends.
This is a weekly series of informal talks given primarily by members of the soft condensed matter and statistical mechanics groups, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..