Printable and stable all-polymer solar cells based on non-conjugated polymer acceptors with excellent mechanical robustness

All-polymer solar cells (all-PSCs) trigger enormous commercial applications, and great progress has been made in recent years. However, from small-area devices to large-area modules, the poor adoption of the materials for printing methods and the large efficiency loss are still great challenges. Herein, three novel non-conjugated polymer acceptors (PTH-Y, PTClm-Yand PTClo-Y) are developed for all-PSCs. It can be found that non-conjugated polymer acceptors can effectively minimize the technique and efficiency gaps between small-area spin-coating and large-area blade-printing method, which can facilitate the preparation of large-area flexible device. By directly inheriting the spin-coating condition, the blade-coating processed device based on PTClo-Y achieves an impressive power conversion efficiency (PCE) of 12.42%, comparable to the spin-coating processed one (12.74%). Such non-conjugated polymer system also can well tolerate large-scale preparation and flexible substrate. Notable PCE of 11.94% for large-area rigid device and 11.56% for large-area flexible device are obtained, which is the highest value for large-area flexible all-PSCs fabricated by blade-coating. In addition, the non-conjugated PTClo-Y-based devices show excellent thermal stability and mechanical robustness. These results demonstrate that the non-conjugated polymer acceptors are potential candidates for the fabrication of highly-efficient, large-area and robust flexible all-PSCs by printing methods.