Oligomerized Fused-Ring Electron Acceptors for Efficient and Stable Organic Solar Cells

Organic solar cells (OSCs) have attracted wide research attention in the past decades. Very recently, oligomerized fused-ring electron acceptors (OFREAs) have emerged as a promising alternative to small-molecular/polymeric acceptor-based OSCs due to their unique advantages such as well-defined structures, batch reproducibility, good film formation, low diffusion coefficient, and excellent stability. So far, rapid advances have been made in the development of OFREAs consisting of directly/rigidly/flexibly linked oligomers and fused ones. In this Minireview, we systematically summarized the recent research progress of OFREAs, including structural diversity, synthesis approach, molecular conformation and packing, and long-term stability. Finally, we conclude with future perspectives on the challenges to be addressed and potential research directions. We believe that this Minireview will encourage the development of novel OFREAs for OSC applications.

Automated summary

Organic solar cells (OSCs) have been extensively studied, and oligomerized fused-ring electron acceptors (OFREAs) have recently emerged as a promising alternative. OFREAs have unique advantages such as well-defined structures, batch reproducibility, and excellent stability. In this Minireview, we provide a systematic summary of the recent research progress of OFREAs, including their structural diversity, synthesis approach, molecular conformation and packing, and long-term stability. We also discuss future perspectives and potential research directions to encourage the development of novel OFREAs for OSC applications.