Abstract
Squaraine dyes have attracted increasing attention as photovoltaic materials for organic solar cells (OSCs) because of their facile and low-cost synthesis, intense and broad absorption in the visible and near-infrared (Vis-NIR) regions as well as colorful films. Herein, we report the synthesis of a novel π-D1-A-D2 type squaraine dye (DTT-USQ-11) with a low optical bandgap of 1.50 eV. In comparison with the classic D1-A-D2 type squaraine dye (USQ-11), DTT-USQ-11 demonstrates a lower optical bandgap, deeper highest occupied molecular orbital (HOMO) energy level, and higher hole mobility. Consequently, solution-processed bulk heterojunction small molecular OSC fabricated with the DTT-USQ-11/PC71BM blend film exhibits a much higher power conversion efficiency (PCE: 5.69%) compared with the classical USQ-11/PC71BM system (PCE: 4.15%). This enhanced PCE can be attributed to the simultaneous increase in the open-circuit voltage, short-circuit current density and fill factor of the DTT-USQ-11-based devices.
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