The presence of defects in the perovskite absorption layer significantly reduces the photovoltaic performance of perovskite solar cells (PSCs). In this study, a Lewis base Triethanolamine (TEA) is introduced on the perovskite surface, and the hydrogen bond formed by its hydroxyl group with Pb ions or I ions fix the halogen anion of perovskite and suppresses the migration of ions in perovskite. TEA has an obvious effect at the grain boundary, significantly improving the surface quality of the perovskite film and the device's efficiency. Compared with the pristine device (19.26%), the device after passivation at the optimal concentration exhibits better photovoltaic performance and stability, which obtained the champion efficiency of 20.39% and remained at 88.3% of the initial efficiency after being aged 1080 h without encapsulation. We expect that adding TEA to the perovskite surface will provide a useful strategy to enhance the performance of PSCs, as well as air and thermal stability.

中文翻译：

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通过引入三乙醇胺提高钙钛矿太阳能电池的效率和稳定性

钙钛矿吸收层中缺陷的存在显着降低了钙钛矿太阳能电池（PSC）的光伏性能。本研究在钙钛矿表面引入路易斯碱三乙醇胺（TEA），其羟基与Pb离子或I离子形成的氢键固定钙钛矿的卤素阴离子，抑制钙钛矿中离子的迁移。 TEA在晶界处具有明显的作用，显着提高钙钛矿薄膜的表面质量和器件效率。与原始器件（19.26％）相比，最佳浓度钝化后的器件表现出更好的光伏性能和稳定性，获得了20.39％的冠军效率，并且在未封装的情况下老化1080小时后仍保持在初始效率的88.3％。我们预计，在钙钛矿表面添加 TEA 将为提高 PSC 的性能以及空气和热稳定性提供有用的策略。