Ultra-flexible organic photovoltaics (OPVs) are promising candidates for next-generation power sources owing to their low weight, transparency, and flexibility. However, obtaining ultra-flexibility under extreme repetitive mechanical stress while maintaining optical transparency remains challenging because of the intrinsic brittleness of transparent electrodes. Here, we introduce strain-durable ultra-flexible semitransparent OPVs with a thickness below 2 μm. The conformal surface coverage of nanoscale thin metal electrodes (< 10 nm) is achieved, resulting in extremely low flexural rigidity and high strain durability. In-depth optical and electrical analyses on ultrathin metal electrodes showed that the devices maintain over 73% of their initial efficiency after 1000 cycles of repetitive compression and release at 66% compressive strain, and the average visible light transmittances remain higher than 30%. To our knowledge, this is the first systematical study on mechanical behaviors of strain-durable ultra-flexible ST-OPVs through precise adjustment of each ultrathin electrode thickness toward the emergence of next-generation flexible power sources.

超柔性有机光伏 (OPV) 因其重量轻、透明和柔韧性而成为下一代电源的有前途的候选者。然而，由于透明电极固有的脆性，在极端重复机械应力下获得超柔韧性同时保持光学透明度仍然具有挑战性。在这里，我们介绍了厚度低于 2 μm 的耐应变超柔性半透明 OPV。实现了纳米级薄金属电极（< 10 nm）的共形表面覆盖，从而具有极低的抗弯刚度和高应变耐久性。对超薄金属电极的深入光学和电气分析表明，在 66% 的压缩应变下重复压缩和释放 1000 次循环后，这些设备保持其初始效率的 73% 以上，平均可见光透过率保持在30%以上。据我们所知，这是首次通过精确调整每个超薄电极厚度来系统研究应变耐用的超柔性 ST-OPV 的机械行为，以实现下一代柔性电源的出现。