New Low‐Bandgap Materials with Good Stabilities and Efficiencies Comparable to P3HT in R2R‐Coated Solar Cells

Roll-to-roll coated organic solar cells of two new polymers processed in ambient conditions show good photochemical stabilities, and their efficiencies are comparable to similar roll-to-roll coated P3HT cells. Optimal blend compositions are achieved by the use of differentially pumped slot die coatings. The final devices show good stabilities in an outdoor experiment carried out over 4 months.