Organic–inorganic halide perovskite photovoltaic devices have advanced rapidly in recent years, and the photoelectric conversion efficiency of perovskite solar cells (PSCs) has exceeded 25%. However, the defects from the crystallization process become nonradiation recombination centers and hinder the performance and the stability of PSCs. Defect passivation by tuning grain size and grain boundary (GB) is an effective strategy to reduce the defects on GBs and film surface. Herein, recent progress in the passivation strategy for perovskite films is summarized, including nonstoichiometric passivation, iodide vacancies filling, dimensional engineering, passivation with crosslink, physical passivation, and other passivation methods. These passivation strategies play an important role in improving the quality of perovskite films, adjusting the energy band structure, reducing the density of defect states, and suppressing the nonradiative recombination of carriers. Finally, this review puts forward the development direction of passivation strategies to further improve the performance of PSCs.

中文翻译：

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高效稳定太阳能电池的钙钛矿钝化策略

近年来，有机–无机卤化物钙钛矿光伏器件发展迅速，钙钛矿太阳能电池（PSC）的光电转换效率已超过25％。但是，结晶过程中产生的缺陷成为非辐射复合中心，并阻碍了PSC的性能和稳定性。通过调节晶粒尺寸和晶界（GB）进行的钝化钝化是减少GB和膜表面缺陷的有效策略。本文总结了钙钛矿薄膜钝化策略的最新进展，包括非化学计量钝化，碘化物空位填充，尺寸工程，交联钝化，物理钝化以及其他钝化方法。这些钝化策略在改善钙钛矿薄膜的质量中起着重要的作用，调整能带结构，降低缺陷态的密度，并抑制载流子的非辐射复合。最后，本文提出了钝化策略的发展方向，以进一步提高PSC的性能。