The defects and strain of the buried SnO₂/perovskite interface seriously affects the performances of n-i-p type perovskite solar cells. Herein, caesium closo-dodecaborate (B₁₂H₁₂Cs₂) is introduced into buried interface to improve the device performances. B₁₂H₁₂Cs₂ can passivate the bilateral defects of the buried interface, including the oxygen vacancy and uncoordinated Sn²⁺ defects on SnO₂ side and the uncoordinated Pb²⁺ defects on perovskite side. Three-dimensional aromatic B₁₂H₁₂Cs₂ can promote the interface charge transfer and extraction. [B₁₂H₁₂]²⁻ can enhance the interface connection of buried interface by forming B-H---H-N dihydrogen bond and coordination bonds with metal ions. Meanwhile, the crystal properties of perovskite films can be improved and the buried tensile strain can be released by B₁₂H₁₂Cs₂ due to the matched lattice between B₁₂H₁₂Cs₂ and perovskite. In addition, Cs⁺ can diffuse into perovskite to reduce the hysteresis behavior by inhibiting the I⁻ migration. Arising from the enhanced connection performances, passivated defects, improved perovskite crystallization, enhanced charge extraction, inhibited ions migration, released tensile strain at buried interface by B₁₂H₁₂Cs₂, the corresponding devices yield a champion power conversion efficiency of 22.10% with enhanced stability. The stability of devices by B₁₂H₁₂Cs₂ modification have been improved, and it can still maintain 72.5% of the original efficiency after 1440 h, while the control devices can only maintain 20% of the original efficiency after aging in air condition of 20–30% RH.

_{埋入式SnO 2} /钙钛矿界面的缺陷和应变严重影响n -ip 型钙钛矿太阳能电池的性能。在此，将近十二硼酸铯 (B ₁₂ H ₁₂ Cs ₂ ) 引入掩埋界面以提高器件性能。B ₁₂ H ₁₂ Cs ₂可以钝化掩埋界面的双侧缺陷，包括SnO _{2侧的氧空位和未配位的Sn} ²⁺缺陷以及钙钛矿侧的未配位的Pb ^2+缺陷。三维芳B ₁₂ H ₁₂ Cs₂可以促进界面电荷的转移和提取。[B ₁₂ H ₁₂ ] ^{2−可以通过与金属}离子形成BH---HN双氢键和配位键来增强埋入界面的界面连接。同时，由于B ₁₂ H ₁₂ Cs _{2与钙钛矿之间的}晶格_{匹配，B 12} H ₁₂ Cs ₂可以改善钙钛矿薄膜的晶体性能并释放埋藏的拉伸应变。此外，Cs ⁺可以扩散到钙钛矿中，通过抑制 I ^{-来降低滞后行为。}移民。由于 B ₁₂ H ₁₂ Cs ₂增强了连接性能、钝化缺陷、改善钙钛矿结晶、增强电荷提取、抑制离子迁移、释放掩埋界面处的拉伸应变，相应的器件产生了 22.10% 的冠军功率转换效率，增强了稳定。_{B 12} H ₁₂ Cs ₂改性后的器件稳定性得到提高，1440 h后仍能保持原来效率的72.5%，而对照器件在2000年的空气条件下老化后只能保持原来效率的20%。 20–30% 相对湿度。