Non-fused polymerized small-molecular acceptors containing thieno[3,4-c]pyrrole-4,6-dione core for all-polymer solar cells
Ruonan Li, Chao Wang, Chengyi Xiao, Baiqiao Liu, Shijie Liang, Yuhao Li, Yaobin Lu, Yining Sun, Yunhua Xu, Weiwei Li
Abstract
The innovation of polymer acceptors through the polymerized small molecular acceptors (PSMAs) strategy has promoted the rapid development of all-polymer solar cells (all-PSCs) in recent years. However, the non-fused PSMAs have been rarely investigated compared with the fused-ring non-fullerene counterpart. In this work, we reported the synthesis of non-fused PSMAs with thieno[3,4- c ]pyrrole-4,6-dione (TPD) core, exhibiting planar configuration, simplified synthesis, and near-infrared absorption. Two PSMAs with regiorandom or regioregular structures were prepared based on the TPD core, in which all-PSCs offered efficiencies of 4.00% for the regiorandom polymer and 10.99% for the regioregular polymer, respectively, which is among the highest performance for non-fused PSMAs. Further morphological and electrical characterizations unveiled that higher device performance of regioregular TPD-based PSMAs was due to the efficient exciton separation and charge transport with more ordered backbone packing in the solid state. This work demonstrates that the TPD unit is a promising building block for the construction of PSMA polymers, providing more selections for the design of high-performance all-PSCs.