A transition solvent strategy to print polymer:fullerene films using halogen-free solvents for solar cell applications

Lim et al. describes a the use of a good-bad solvent mixture to suppress the twin challenges of contact-line depinning and coffee-stain buildup to obtain uniform ink-jet printed thin films of poly(3-hexylthiophene):phenyl-C61-butyric acid methyl ester with suitable nano-morphology for efficient solar cell applications without using halogen-containing solvents.