Graduate student Wade Luhman has demonstrated a route to enhance the short exciton diffusion length (LD) of organic semiconductors by combining fluorescent and phosphorescent materials into a single electron donating thin film. Here, a near-doubling of the diffusion length is realized in a fluorescent material upon addition of the phosphorescent sensitizer. This work highlights a novel approach to improve the absorption efficiency of organic solar cells, and provides fundamental insight into exciton migration in these materials.
