Molecular engineering of Y-series acceptors for nonfullerene organic solar cells

[摘要] The power conversion efficiencies (PCEs) of single-junction organic solar cells (OSCs) have surpassed 19%, owing to the emerging Y-series nonfullerene acceptors (NFAs). Undoubtedly, the power and flexibility of chemical design has been a strong driver for this rapid efficiency improvement in the OSC field. Over the course of the past 3 years, a variety of modifications have been made to the structure of the Y6 acceptor, and a large number of Y-series NFAs have been reported to further improve performance. Herein, we present our insights into the rationale behind the Y6 acceptor and discuss the design principles toward high-performance Y-series NFAs. It is clear that structural modifications through choice of heteroatom, soluble chains, π spacers, central cores, and end groups alter the material characteristics and properties, contributing to distinctive photovoltaic performance. Subsequently, we analyze various design strategies of Y-series-containing materials, including polymerized small-molecule acceptors (PSMA), non-fused-ring acceptors (NFRA), and all-fused-ring acceptors (AFRA). This review is expected to be of value in providing effective molecular design strategies for high-performance NFAs in future innovations.

[学科分类] 电力

[关键词] molecular engineering;narrow bandgap;nonfullerene;organic solar cell;Y-series acceptor