We have recently published a new paper in an special issue of Physical Chemistry Chemical Physics looking at the efficacy of hot charge transfer states in organic photovoltaic devices (OPVs). Using a Kinetic Monte Carlo model we show that experimental characteristics of hot charge transfer states (particularly the observed ~4nm separation that results) is not sufficient to account for high performance in OPVs – either in idealised donor:acceptor blends or in mixed:aggregated blends. This work suggests that other factors, such as the energetic structure of the donor:acceptor interface, may play a more important role. However, we also stress that the factors underpinning both hot charge transfer states and (for example) cascaded energy heterojunctions are not mutually exclusive. Hot charge transfer states may therefore be the origin of fast charge generation seen in experiment, if not efficiency charge generation on long timescales.
Well done to Matt on his second paper, and to Reesha Dyer on her first!