The efficiency, stability, and scalability of perovskite devices still require further enhancement for real-world application. Defect passivation has been recognized as one prominent strategy that can simultaneously promote the optoelectronic performance and stability of perovskite devices. Here, we demonstrate an additive, titanium tetrafluoride (TiF₄), which could spontaneously enrich at perovskite interfaces and passivate the nearby charge traps efficaciously. Consequently, a power conversion efficiency of 20.19% was attained on the basis of the passivated device with TiF₄, about 22% enhancement over that of the control device without TiF₄. Moreover, the moisture stability of PSCs with TiF₄ was significantly enhanced.

中文翻译：

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四氟化钛对钙钛矿太阳能电池的自发钝化

钙钛矿设备的效率，稳定性和可扩展性仍需要针对实际应用进行进一步增强。缺陷钝化已被认为是一种可以同时提高钙钛矿器件的光电性能和稳定性的重要策略。在这里，我们演示了一种添加剂四氟化钛（TiF ₄），它可以自发富集在钙钛矿界面上并有效钝化附近的电荷陷阱。因此，基于具有TiF ₄的钝化装置，功率转换效率达到20.19％，比没有TiF ₄的控制装置的功率转换效率提高约22％。此外，具有TiF ₄的PSC的水分稳定性显着增强。