Conjugated polymers of diketopyrrolopyrrole (DPP) and thiophene, especially 2,5-di-2-thienyl-thieno[3,2-b]thiophene, were characterized by their molecular packing orientation with a π-π stacking distance of 3.6 Å and a high field-effect hole mobility on the order of 10−2 cm2/Vs. A perovskite solar cell, fabricated with the genuine or both oxidizing and salt dopant-free polymer as a hole-transporting layer, displayed a high photo-conversion efficiency of 16.3% with high durability.
- Hirofumi Maruo
- Yusuke Sasaki
- Hiroyuki Nishide
