Organic solar cells (OSCs) have received considerable attention and demonstrated great potential as flexible, lightweight, semitransparent, and low-cost energy sources.Flexible OSCs have practical applications in wearable electronics,portable chargers for back bags and tents, solar airships, etc.Many efforts have been made to improve the performance of flexible OSCs, including the development of flexible transparent electrodes, new organic materials, and optimization of the device structure.Progresses have been achieved in the last few years, and power conversion efficiencies (PCEs) of 16.1％[1], 16.5％[2], 13.61％[3], and 10.09％[4] for 0.04 cm2 singlejunction device, 0.04 cm2 tandem device, 1 cm2 single-junction device, and 25 cm2 module were reported.