The failure of perovskite solar cells (PSCs) to maintain their maximum efficiency over a prolonged time is due to the deterioration of the light harvesting material under environmental factors such as humidity, heat, and light. Systematically elucidating and eliminating such degradation pathways are critical to imminent commercial use of this technology. Here, a straightforward approach is introduced to reduce the level of defect‐states present at the perovskite and hole transporting layer interface by treating the various perovskite surfaces with poly(N,N′‐bis‐4‐butylphenyl‐N,N′‐bisphenyl)benzidine (polyTPD) molecules. This strategy significantly suppresses the defect‐mediated non‐radiative recombination in the ensuing devices and prevents the penetration of degrading agents into the inner layers by passivating the perovskite surface and grain boundaries. Suppressed non‐radiative recombination and improved interfacial hole extraction result in PSCs with stabilized efficiency exceeding 21% with negligible hysteresis (≈19.1% for control device). Moreover, ultra‐hydrophobic polyTPD passivant considerably alleviates moisture penetration, showing ≈91% retention of initial efficiencies after 300 h storage at high relative humidity of 80%. Similarly, passivated device retains 94% of its initial efficiency after 800 h under operational conditions (maximum power point tracking under continuous illumination at 60 °C). In addition to interfacial passivation function, hole‐selective role of dopant‐free polyTPD is also evaluated and discussed in this study.

中文翻译：

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基于聚（N，N'-双-4-丁基苯基-N，N'-双苯基）联苯胺的界面钝化策略可提高常规结构中钙钛矿型太阳能电池的效率和运行稳定性

钙钛矿太阳能电池（PSC）不能在长时间内保持最大效率的原因是由于集光材料在诸如湿度，热量和光照等环境因素下的劣化。系统地阐明和消除此类降解途径对于该技术的商业化应用至关重要。在这里，我们引入了一种简单的方法，通过用聚（N，N'-双-4-丁基苯基-N，N'-联苯基）联苯胺（polyTPD）分子。该策略可显着抑制后续设备中的缺陷介导的非辐射复合，并通过钝化钙钛矿表面和晶界来防止降解剂渗入内层。抑制了非辐射重组，改善了界面空穴的提取，可使PSC的稳定效率超过21％，而磁滞则可忽略不计（对于控制装置约为19.1％）。此外，超疏水的polyTPD钝化剂可显着缓解水分渗透，在80％的高相对湿度下储存300小时后，显示出初始效率保持约91％。同样，在运行条件下（在60°C的连续照明下，最大功率点跟踪），钝化器件在800 h后仍保持其初始效率的94％。