Despite attractive cost‐effectiveness, scalability, and superior stability, carbon‐based printable perovskite solar cells (CPSCs) still face moisture‐induced degradation that limits their lifespan and commercial potential. Here, the moisture‐preventing mechanisms of thin nanostructured super‐repellent coating (advancing contact angle >167° and contact angle hysteresis 7°) integrated into CPSCs are investigated for different moisture forms (falling water droplets vs water vapor vs condensed water droplets). It is shown that unencapsulated super‐repellent CPSCs have superior performance under continuous droplet impact for 12 h (rain falling experiments) compared to unencapsulated pristine (uncoated) CPSCs that degrade within seconds. Contrary to falling water droplets, where super‐repellent coating serves as a shield, water vapor is found to physisorb through porous super‐repellent coating (room temperature and relative humidity, RH 65% and 85%) that increase the CPSCs performance for 21% during ≈43 d similarly to pristine CPSCs. It is further shown that water condensation forms within or below the super‐repellent coating (40 °C and RH 85%), followed by chemisorption and degradation of CPSCs. Because different forms of water have distinct effects on CPSC, it is suggested that future standard tests for repellent CPSCs should include rain falling and condensate formation tests. The findings will thus inspire the development of super‐repellent coatings for moisture prevention.

中文翻译：

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超级防液滴碳基可印刷钙钛矿太阳能电池

尽管碳基可印刷钙钛矿太阳能电池（CPSC）具有有吸引力的成本效益、可扩展性和卓越的稳定性，但仍然面临水分引起的降解，从而限制了其使用寿命和商业潜力。在此，研究了集成到 CPSC 中的薄纳米结构超防水涂层（前进接触角 >167° 和接触角滞后 7°）针对不同水分形式（落下的水滴、水蒸气和冷凝水滴）的防潮机制。结果表明，与未封装的原始（未涂层）CPSC 在数秒内降解相比，未封装的超防水 CPSC 在 12 小时的连续液滴冲击（降雨实验）下具有优越的性能。与下落的水滴相反，超防水涂层充当屏蔽，水蒸气通过多孔超防水涂层进行物理吸附（室温和相对湿度，相对湿度 65% 和 85%），从而使 CPSC 性能提高 21%与原始 CPSC 类似，约 43 d。进一步表明，在超防水涂层（40°C，相对湿度 85%）内部或下方形成水凝结，然后发生化学吸附和 CPSC 降解。由于不同形式的水对 CPSC 的影响不同，建议未来的防水 CPSC 的标准测试应包括降雨和冷凝水形成测试。因此，这些发现将激发用于防潮的超防水涂层的开发。