Enabling roll-processed and flexible OSCs based on PffBT4T-C9C13 through temperature controlled slot-die coating

In this work, we demonstrate a route to up-scale organic solar cells based on PffBT4T-C9C13:O-IDTBR, solving the challenges that using a temperature dependant aggregation (TDA) polymer can bring to the upscaling to a roll-processing fabrication. The fabricated devices were fabricated through slot-die coating under ambient conditions, and in flexible substrates, showing efficiencies above 4% for the optimized devices. Hydrocarbon-based solvent, more environmentally friendly, were also used, in order to ensure another necessary step for the scalability of this material combination. To the best of our knowledge, is this is the first work reporting PffBT4T-C9C13:O-IDTBR solar cells fabricated on flexible substrates through slot-die coating in a roll-platform, showcasing the efficiencies that would be possible to obtain in a full roll-to-roll manufacturing, and showing that the scalability lag to overcome for this system is still really large.