In 2022,Wang, Hang; Lu, Hao; Chen, Ya-Nan; Ran, Guangliu; Zhang, Andong; Li, Dawei; Yu, Na; Zhang, Zhe; Liu, Yahui; Xu, Xinjun; Zhang, Wenkai; Bao, Qinye; Tang, Zheng; Bo, Zhishan published an article in Advanced Materials (Weinheim, Germany). The title of the article was 《Chlorination Enabling a Low-Cost Benzodithiophene-Based Wide-Bandgap Donor Polymer with an Efficiency of over 17%》.Electric Literature of C4H2Br2S The author mentioned the following in the article:
Three regioregular benzodithiophene-based donor-donor (D-D)-type polymers (PBDTT, PBDTT1Cl, and PBDTT2Cl) are designed, synthesized, and used as donor materials in organic solar cells (OSCs). Because of the weak intramol. charge-transfer effect, these polymers exhibit large optical bandgaps (>2.0 eV). Among these three polymers, PBDTT1Cl exhibits more ordered and closer mol. stacking, and its devices demonstrate higher and more balanced charge mobilities and a longer charge-separated state lifetime. As a result of these comprehensive benefits, PBDTT1Cl-based OSCs give a very impressive power conversion efficiency (PCE) of 17.10% with a low nonradiative energy loss (0.19 eV). Moreover, PBDTT1Cl also possesses a low figure-of-merit value and good universality to match with different acceptors. This work provides a simply and efficient strategy to design low-cost high-performance polymer donor materials. In the part of experimental materials, we found many familiar compounds, such as 2,5-Dibromothiophene(cas: 3141-27-3Electric Literature of C4H2Br2S)
2,5-Dibromothiophene(cas: 3141-27-3) , is mainly used as pharmaceutical intermediate and synthesis intermediate. 2,5-Dibromothiophene may be used in the preparation of soluble α,ω-diformyl-a-oligothiophenes.Electric Literature of C4H2Br2S
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary