| 초록 |
In this work, a wide band gap polymer (WBG) donor based on dithienobenzothiadiazole (DTBT) and benzodithiophene (BDT) was synthesized and explored for the organic solar cells. Siloxane-side chain was introduced on BDT unit to further improve the solubility, blend miscibility and film morphology. New polymer DT-Sil-BDT showed film absorption peak at 450 nm and optical band gap of 2.19 eV. The complementary absorption and energy offsets observed between DT-Sil-BDT polymer donor and IT-4F acceptor. The DT-Sil-BDT:IT-4F based OSCs resulted an open-circuit voltage of 0.78 V, a short-circuit current density of 16.60 mA cm−2, and a fill factor of 62.56%, corresponding to a power conversion efficiency (PCE) of 8.15%. Further optimizations can enhance the performance of DT-Sil-BDT based OSCs. The results emphasize that DT-Sil-BDT can be a powerful donor, which is favorable in the construction of simple WBG polymer donors for efficient OSCs. |
