【摘要】 埋底界面修饰可以有效提高钙钛矿太阳能电池的效率和稳定性。本工作通过采用双（三苯基磷）氯化钴（BTPPCC）作为预埋底界面的表面修饰剂，成功钝化了MAPbI3钙钛矿薄膜下表面富集的缺陷，优化了钙钛矿薄膜与下方空穴传输层（HTL）之间的界面接触，提高了钙钛矿光吸收层的结晶性能。此外，BTPPCC还有效地抑制了界面电荷的非辐射复合作用，改善器件的长期稳定性，使得p-i-n型器件的能量转换效率（PCE）从18.37%提升至20.12%，未封装器件在相对湿度（RH）为50%的室温环境空气中连续工作近500 h后仍保持初始效率的76%以上。这为钙钛矿埋底界面优化提供了一种有效的方法。更多还原

【Abstract】 Interface engineering at the bottom can effectively enhance the efficiency and stability of perovskite solar cells. In this study, the surface modifier, bis(triphenylphosphine) cobalt chloride(BTPPCC), was employed as a pre-buried interface modifier, successfully passivating the surface-enriched defects of MAPbI3 perovskite films. This optimization improved the interface contact between the perovskite film and the underlying hole transport layer(HTL), enhancing the crystalline performance of the perovskite absorption layer. Additionally, BTPPCC effectively suppressed non-radiative recombination at the interface, improving the long-term stability of the device. As a result, the power conversion efficiency(PCE) of the p-i-n type device increased from 18. 37% to 20. 12%. The unencapsulated device maintained an efficiency of over 76% after continuous operation for nearly 500 hours in an ambient air environment with a relative humidity(RH) of 50% at room temperature. This study provides an effective method for optimizing the buried interface in perovskite solar cells.更多还原