Synthesis and photovoltaic characteristics of push-pull organic semiconductors containing an electron-rich dithienosilole bridge for solution-processed small-molecule organic solar cells

The synthesis and characterization of unprecedented push-pull organic semiconductors, TPA-Th-DTSi-[HxTh]2-HCA (1), TPA-Th-DTSi-[HxTh]2-MMN (2), bisDMFA-Th-DTSi-[HxTh]2-HCA (3), and bisDMFA-Th-DTSi-[HxTh]2-MMN (4)-possessing a π-conjugated thiophene bridge incorporating electron-rich dithienosiole (DTSi) moieties-are described, along with an investigation of their photovoltaic performances in solution-processed SMOSCs.