Energy-effectively printed all-polymer solar cells exceeding 8.61% efficiency

Higher-efficiency all polymer solar cells are fabricated by an industrially suitable doctor-blading technique in ambient atmosphere than that by spin-coating in nitrogen atmosphere. The favourable phase separation with optimized crystallization and interpenetrating polymer networks can be achieved by incorporating 1,8-diiodooctane into chlorobenzene, owing to the prolonged drying time of the all-polymer active film from 120 to 1000 s. Consequently, the highest PCEs of 8.61% and 7.12% are obtained in printed all-PSCs with ITO-based rigid substrate and ITO-free flexible substrate to date, respectively.402