All‐inorganic perovskite solar cells (PSCs) have attracted a lot of attention in the past few years because of their preeminent thermal stability compared with organic–inorganic hybrid PSCs. Among all kinds of all‐inorganic perovskites, CsPbI₃ perovskite with a proper bandgap of ≈1.7 eV becomes the most competitive candidate. However, its poor phase stability, hydrophobicity, and high‐density defects have limited the development of CsPbI₃ PSCs. To overcome these obstacles for achieving high‐performance CsPbI₃ PSCs, additive engineering has been widely used, which has rapidly promoted the power conversion efficiency (PCE) to over 19%. Herein, the progress of additive engineering in CsPbI₃ PSCs is systematically reviewed. First, the roles of additives in CsPbI₃ PSCs are introduced, including improving phase stability, increasing moisture resistance, and passivating defects. Then, the additive engineering is categorized (additive engineering in perovskites and at perovskite/hole transport layer interfaces) and reviewed in detail. Finally, future research directions on additive engineering are suggested for further enhancing stability and improving PCE.

中文翻译：

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高性能CsPbI3钙钛矿太阳能电池的添加工程

在过去的几年中，全无机钙钛矿太阳能电池（PSC）与有机-无机杂化PSC相比具有卓越的热稳定性，因此受到了广泛的关注。在所有种类的无机钙钛矿中，带隙约为1.7 eV的CsPbI ₃钙钛矿成为最具竞争力的候选材料。然而，其差的相稳定性，疏水性和高密度缺陷限制了CsPbI ₃ PSC的开发。为了克服实现高性能CsPbI ₃ PSC的这些障碍，增材制造工程得到了广泛应用，可将功率转换效率（PCE）迅速提高到19％以上。本文介绍了CsPbI ₃中添加剂工程的进展对PSC进行了系统的审查。首先，介绍了添加剂在CsPbI ₃ PSC中的作用，包括改善相稳定性，提高耐湿性和钝化缺陷。然后，对添加剂工程进行分类（钙钛矿中和钙钛矿/空穴传输层界面处的添加剂工程）并进行详细审查。最后，提出了关于添加剂工程的未来研究方向，以进一步提高稳定性和改善PCE。