Near-Infrared Absorbing Nonfullerene Acceptors for Organic Solar Cells

Materials with intense near-infrared (NIR) absorption, especially electron acceptors, play crucial roles in the development of organic solar cells (OSCs) due to their capability in harvesting low-energy photons to enable high photocurrent. Herein, the NIR nonfullerene acceptors (NFAs) are focused by briefly reviewing the development to understand the molecular design strategies, structure–property–performance relationships, and the great potential of NIR NFAs in fabricating ternary and tandem OSCs. Outlooks for future design of NIR NFAs are also provided by considering material stability and production cost based on current knowledges, in hope of aiding the further development of the field.