Dithienobenzothiadiazole-Based Polymer Donor with Siloxane Terminal Groups in All-Polymer Solar Cells
발표자
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초록
내용
A wide band gap (WBG) polymer donor based on dithienobenzothiadiazole (DTBT) and benzodithiophene (BDT) was explored for the organic solar cells. Siloxane based side chain was introduced on BDT unit to further improve the solubility, blend miscibility and film morphology. New polymer Sil-D1 was synthesized and carried out the characterizations systematically. Sil-D1 showed film absorption peak at 450 nm and optical band gap of 2.19 eV. The complementary absorption and energy offsets were observed between Sil-D1, PM6 polymer donors and PY-IT acceptor. The PM6: Sil-D1: PY-IT based All-PSCs resulted an open-circuit voltage of 0.94 V, a short-circuit current density of 23.75 mA cm−2, and a fill factor of 66.0%, corresponding to a power conversion efficiency (PCE) of 14.7%. The results emphasize that Sil-D1 can be a powerful donor, which is favorable in the construction of simple WBG polymer donors for efficient All-PSCs.