Research on perylene diimide organic solar cells

The power conversion efficiency (PCE) of non-fullerene (NF) organic solar cells (OSCs) has reached 10%, which plays a necessary role in the field of new OSCs. The significant factor to determine the high photovoltaic performance of NF OSCs is the blend film structure, that is matched by a specific proportion of compound donor and acceptor. The electronic receptor structure in the blend membrane is mainly functionalized to optimize the membrane morphology and improve the interface quality, and then applied to the new binary/ternary OSCs device. Here we emphatically introduced the NF small molecule material-perylene diimide (PDI), the kind of acceptors with multiply modified structures, connecting with their matching with typical donors can improve charge mobility. We expound the recent representative studies on the progressive modification of PDI-based materials through matching with same or different donors, further discuss the challenges on how to reduce the large efficiency loss when going from small-area to large-area fabrication. In general, achieving the excellent miscibility of donor-acceptor is the most critical factor to improve high efficiency OSCs, which has important guiding significance for manufacturing organic photovoltaic materials.