Nonfullerene n-Type Organic Semiconductors for Perovskite Solar Cells

Compared to inorganic semiconductors and/or fullerene derivatives, nonfullerene n-type organic semiconductors present some advantages, such as low-temperature processing, flexibility, and molecule structure diversity, and have been widely used in perovskite solar cells (PSCs). In this research news article, the recent advances in nonfullerene n-type organic semiconductors which function as electron-transporting, interface-modifying, additive, and light-harvesting materials in PSCs are summarized. The remaining challenges and promising future directions of nonfullerene-based PSCs are also discussed.