James Kerfoot, supervisor Prof. Peter Beton and colleagues at the University of Nottingham have had a paper accepted in J. Phys Chem. C on exciton diffusion in monolayer organic materials in a collaboration with our Manchester group.
In this new work, advanced AFM techniques are coupled to optical micro-spectroscopy to monitor the quenching of excitons in PTCDI by fullerenes on a hexagonal boron nitride substrate. In this experiment James was able to determine the lateral exciton diffusion length in PTCDI to be around 17nm; this is relatively large given the lack of pi-stacking in this architecture.
This study points towards the need for further understanding in exciton migration in 2D assemblies of molecules.
Reference: “Two-Dimensional Diffusion of Excitons in a Perylene Diimide Monolayer Quenched by a Fullerene Heterojunction”, Kerfoot et al., J. Phys. Chem. C, 2019 DOI: 10.1021/acs.jpcc.9b01413