Dithienosilole-based small molecule donors for efficient all-small-molecule organic solar cells

Two small molecule (SM) donors using thieno[3,2-b]thiophene (TT) or thiophene as π-bridge to link dithienosilole (DTS) and the terminal group in conjunction with the SM acceptor IDT-C8 were employed for the fabrication of All-SMSCs. All-SMSCs based on DINTTDTS give power conversion efficiency (PCE) of 2.79%. However, All-SMSCs made with DINDTS achieve a higher PCE of 4.52%, which are mainly due to the better complementary absorption between DINDTS and IDT-C8 and its better morphology of active layers.282