Dithienosilole-based small molecule donors for efficient all-small-molecule organic solar cells. (November 2018)

• Record Type: Journal Article
• Authors: Chen, Xianjie; Sun, Yanna; Wang, Zhaolong; Gao, Huanhuan; Lin, Zhijing; Ke, Xin; He, Tian; Yin, Shouchun; Chen, Yongsheng; Zhang, Qian; Qiu, Huayu
• Is Part Of: Dyes and pigments. Volume 158(2018)
• Page Start: 445
• Page End: 450
• Publication Date: 2018-11
• Subjects: All-small-molecule solar cells -- Dithienosilole -- π-bridge -- Non-fullerene -- Morphology; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2018.06.006
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: 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 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. The effect of different π-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. Graphical abstract: 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. Image 1 Highlights: Two small molecule (SM) donors with different π-bridges were synthesized. All-small-molecule solar cells were fabricated using these SMs with a non-fullerene acceptor. Thiophene-based devices gave a higher PCE of 4.52% than that of thieno[3, 2- b ]thiophene-based devices (2.79%).