10 August, 2022
Our recent collaboration work with Prof. Li’s group ( Beijing University of Chemical Technology, China) is now published in Angewandte Chemie International Edition. In this work, symmetric (s-DCPIC) and asymmetric (as-DCPIC) near-infrared double-cable conjugated polymers based on a non-fused-ring thieno[3,4-c]pyrrole-4,6-dione (TPD) core with 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile (IC) side units were successfully synthesized for application in single-component organic solar cells (SCOSCs). In addition, an asymmetric design motif is adopted to optimize the packing of donor and acceptor segments, enhancing charge separation efficiency. The asymmetric polymer exhibited improved hole mobility, leading to SCOSCs with high quantum efficiencies over 0.80 and power conversion efficiencies over 10 %. The transient absorption results showed that the poor performance of s-DCPIC is mainly due to ineffective charge generation and partly due to the dominance of geminate recombination.