Dithienobenzothiadiazole-Based Polymer Donor with Phenyl substituted Siloxane Terminal Groups in All-Polymer Solar Cells
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초록
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The all-polymer solar cells were investigated using a wide band gap (WBG) polymer donor based on dithienobenzothiadiazole (DTBT) and benzodithiophene (BDT). To further enhance solubility, blend miscibility, and film morphology, a side chain made of Phenyl group substituted with siloxane was added to the BDT unit. New polymer Ph-Sil-D1 was synthesized and carried out the characterizations systematically. Ph-Sil-D1 showed film absorption peak at 380 nm and optical band gap of 2.20 eV. The complementary absorption and energy offsets were observed between Ph-Sil-D1, PM6 polymer donors and PY-IT acceptor. The PM6: Ph-Sil-D1: PY-IT based All-PSCs resulted an open-circuit voltage of 0.93 V, a short-circuit current density of 25.4 mA cm−2, and a fill factor of 68.9%, corresponding to a power conversion efficiency (PCE) of 16.1%. The results emphasize that Ph-Sil-D1 can be a powerful donor, which is favorable in the construction of simple WBG polymer donors for efficient All-PSCs.