Commercialization of lead halide perovskite-based devices is hindered by their instability towards environmental conditions. In particular, water promotes fast decomposition, leading to a drastic decrease in device performance. Integrating water-splitting active species within ancillary layers to the perovskite absorber might be a solution to this, as they could convert incoming water into oxygen and hydrogen, preserving device performance. Here, we suggest that a CuSCN nanoplatelete/p-type semiconducting polymer composite, combining hole extraction and transport properties with water oxidation activity, transforms incoming water molecules and triggers the in situ p-doping of the conjugated polymer, improving transport of photocharges. Insertion of the nanocomposite into a lead perovskite solar cell with a direct photovoltaic architecture causes stable device performance for 28 days in high-moisture conditions. Our findings demonstrate that the engineering of a hole extraction layer with possible water-splitting additives could be a viable strategy to reduce the impact of moisture in perovskite devices.

基于钙钛矿的卤化铅器件的商业化由于其对环境条件的不稳定性而受到阻碍。特别是，水促进了快速分解，从而导致器件性能急剧下降。将辅助层内的水分解活性物质整合到钙钛矿吸收剂中可能是解决此问题的方法，因为它们可以将进入的水转化为氧气和氢气，从而保持设备的性能。在这里，我们建议CuSCN纳米片/ p型半导体聚合物复合材料将空穴提取和传输性质与水的氧化活性结合起来，转化进入的水分子并触发共轭聚合物的原位p掺杂，从而改善光电荷的传输。将纳米复合材料插入具有直接光伏架构的钙钛矿铅太阳能电池中，可在高湿度条件下稳定28天的器件性能。我们的发现表明，使用可能的水分解添加剂对空穴提取层进行工程设计可能是减少钙钛矿设备中水分影响的可行策略。