Recent Advances and Prospects of D1:D2:A Non-fullerene Ternary Polymer Solar Cells

Ternary polymer solar cells (PSCs) exhibit broader absorption band, greater poternial in micro-morphology regulation, energy level tuning, and other advantages compared with binary PSCs and is a facile and efficient approach for further enhancing photovoltaic performances. Because of much more complicated morphology forming process, the ternary devices with two donors and one non-fullerene acceptor is difficult to regulate compared with the ternary devices with one donor and two acceptors, whereas, shows greater potential in improving the morphology stability of active layer film, which is one of the biggest obstacles that hinder the commercialization of PSCs. This review systematically summarizes the principles and functions of the third component of high-performance non-fullerenes ternary PSCs and outlines the recent advancements of ternary PSCs with two donors and one non-fullerene acceptor including two polymer donors and small molecular acceptor, all-polymer PSCs, and PSCs with small molecule donors. Their relationships between composition and property were carefully examined and outlined, in addition, the valuable guidelines in developing high efficiency and high stability non-fullerene ternary PSCs are demonstrated.