Environment-friendly manufacturing and mechanical robustness are imperative for commercialization of flexible OSCs as green-energy source, especially in portable and wearable self-powered flexible electronics. Although, the commonly adopted PEDOT:PSS electrodes that are treated with severely corrosive and harmful acid lack foldability. Herein, efficient folding-flexible OSCs with highly conductive and foldable PEDOT:PSS electrodes processed with eco-friendly cost-effective acid and polyhydroxy compound are demonstrated. The acid treatment endows PEDOT:PSS electrodes with high conductivity. Meanwhile, polyhydroxy compound doping contributes to excellent bending flexibility and foldability due to the better film adhesion between PEDOT:PSS and PET substrate. Accordingly, folding-flexible OSCs with high efficiency of 14.17% were achieved. After 1,000 bending or folding cycles, the device retained over 90% or 80% of its initial efficiency, respectively. These results represent one of the best performances for ITO-free flexible OSC reported so far and demonstrate a novel approach toward commercialized efficient and foldable green-processed OSCs.

环保制造和机械坚固性对于将柔性OSC作为绿色能源进行商业化至关重要，尤其是在便携式和可穿戴式自供电柔性电子产品中。虽然，经过严重腐蚀和有害酸处理的常用PEDOT：PSS电极缺乏可折叠性。在本文中，展示了具有高导电性和可折叠性的PEDOT：PSS电极的高效可折叠柔性OSC，该电极经过环保型成本效益高的酸和多羟基化合物处理。酸处理赋予PEDOT：PSS电极高电导率。同时，由于PEDOT：PSS与PET基材之间更好的膜粘附性，多羟基化合物的掺杂有助于出色的弯曲柔韧性和可折叠性。因此，获得了具有14.17％的高效率的可折叠柔性OSC。1之后 000次弯曲或折叠循环后，该设备分别保持了其初始效率的90％或80％以上。这些结果代表了迄今为止所报告的不含ITO的柔性OSC的最佳性能之一，并证明了一种新颖的方法可用于商业化的高效且可折叠的绿色加工OSC。