Fiber-shaped solar cells (FSCs) are promising power sources for wearable electronics. Fiber-shaped organic solar cells (FOSCs) are particularly attractive due to their all-solid-state nature, ease of fabrication, and environmental friendliness. However, their efficiency has lagged behind other FSC types. This work demonstrates efficient FOSCs using non-fullerene acceptors (NFAs), achieving efficiencies exceeding 9% under AM 1.5 G irradiation. The study systematically investigates performance-influencing factors, including transport layers, active layer composition, counter electrodes, solvents, and environmental humidity. The FOSCs successfully power electrical devices and are woven into textiles to charge a smartwatch, highlighting their potential for wearable electronics.

Dan Lv, Qianqing Jiang, Yuanyuan Shang, Dianyi Liu