Textile-compatible photovoltaics play a crucial role as a continuous source of energy in wearable devices. In contrast to other types of energy harvester, they can harvest sufficient electricity (on the order of milliwatts) for wearable devices by utilizing the cloth itself as the platform for photovoltaics. Three features are important for textile-compatible photovoltaics, namely environmental stability, sufficient energy efficiency and mechanical robustness. However, achieving these simultaneously remains difficult because of the low gas barrier properties of ultrathin superstrates and substrates. Here, we report on ultraflexible organic photovoltaics coated on both sides with elastomer that simultaneously realize stretchability and stability in water whilst maintaining a high efficiency of 7.9%. The efficiency of double-side-coated devices decreases only by 5.4% after immersion in water for 120 min. Furthermore, the efficiency of the devices remains at 80% of the initial value even after 52% mechanical compression for 20 cycles with 100 min of water exposure.

与纺织品兼容的光伏电池在可穿戴设备中作为连续能源发挥着至关重要的作用。与其他类型的能量收集器相比，它们可以利用布料本身作为光伏平台，为可穿戴设备收集足够的电能（以毫瓦为单位）。对于兼容纺织品的光伏来说，三个特征很重要，即环境稳定性，足够的能源效率和机械强度。然而，由于超薄覆板和基板的低气体阻隔性，同时实现这些仍然很困难。在这里，我们报道了在两面都涂有弹性体的超柔性有机光伏电池，该弹性体同时实现了水中的可拉伸性和稳定性，同时保持了7.9％的高效率。浸入水中120分钟后，双面涂层设备的效率仅降低5.4％。此外，即使在52％的机械压缩下暴露100分钟的水20个循环后，设备的效率仍保持在初始值的80％。