PBDTT-DPP (CAS 1380582-98-8) is a low bandgap polymer with strong photosensitivity in the range of 650 – 850 nm, with an onset absorption at 858 nm (Eg = 1.45 eV, near infrared absorption). However, it is less sensitive to visible light in the solar spectrum making it an ideal candidate for tandem solar cell structures, having achieved device performances of 8.62% (with device structure ITO/ZnO/P3HT:ICBA/PEDOT:PSS/ZnO/PBDTT-DPP:PC71BM/Ag).
Additionally, a single-layer device based on PBDTT-DPP was shown to demonstrate a power conversion efficiency of 6%.[1] It also finds application in perovskite solar cells due to its perfect energy level line-ups with perovskites.