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

作者：Chen, Xianjie; Sun, Yanna; Wang, Zhaolong; Gao, Huanhuan; Lin, Zhijing; Ke, Xin; He, Tian; Yin, Shouchun; Chen, Yongsheng; Zhang, Qian^*; Qiu, Huayu^*

来源：Dyes and Pigments, 2018, 158: 445-450.

DOI：10.1016/j.dyepig.2018.06.006

• All-small-molecule solar cells
• Dithienosilole
• pi-bridge
• Non-fullerene
• Morphology

Remarkable progress has been achieved in non-fullerene polymer organic solar cells. However, most all-small-molecule solar cells (All-SMSCs) exhibit poor performance. In this work, two small molecule (SM) donors using thieno[3,2-b]thiophene (TT) or thiophene as pi-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. The effect of different pi-bridges of the donors on the photovoltaic performance was systematically investigated. DINTTDTS which consists of TT unit presents red shift and stronger crystallinity compared with DINDTS containing a thiophene linker. However, DINDTS film shows a better complementary absorption to that of IDT-C8. 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.

• 出版日期2018-11
• 单位南开大学; 杭州师范大学