G.E. Collis, S. Maniam, A.B. Holmes, G. Leeke
Keywords: organic electronics, computational modelling, structure-property relationships, dye sensitised solar cells, supercritical carbon dioxide, device efficiency and stability
Summary:Material design and processing of materials in devices have a direct impact on device performance and lifetime. Using computational modelling we are able to design novel dyes that have similar electronic properties, but differ greatly in solubilities properties. We are able to deposit these dyes in DSSCs using conventional organic solvents or supercritical carbon dioxide. We observe several advantages of using supercritical carbon dioxide as the processing solvent, such as, shorter deposition times, improved device performance, easy recovery of unreacted dye, recovery of solvent for reuse and most importantly, enhanced device stability. We have attempted to understand the origins of these improvements and expect these findings can be used in other applications.