Enhancing the efficiency of planar heterojunction perovskite solar cells via interfacial engineering with 3-aminopropyl trimethoxy silane hydrolysate

The interfacial compatibility between compact TiO2 and perovskite layers is critical for the performance of planar heterojunction perovskite solar cells (PSCs). A compact TiO2 film employed as an electron-transport layer (ETL) was modified using 3-aminopropyl trimethoxy silane (APMS) hydrolysate. The power conversion efficiency (PCE) of PSCs composed of an APMS-hydrolysate-modified TiO2 layer increased from 13.45 to 15.79%, which was associated with a significant enhancement in the fill factor (FF) from 62.23 to 68.04%. The results indicate that APMS hydrolysate can enhance the wettability of γ-butyrolactone (GBL) on the TiO2 surface, form a perfect CH3NH3PbI3 film, and increase the recombination resistance at the interface. This work demonstrates a simple but efficient method to improve the TiO2/perovskite interface that can be greatly beneficial for developing high-performance PSCs.

致密TiO₂层与钙钛矿层之间的界面相容性对平面异质结钙钛矿太阳能电池（PSCs）的性能至关重要。采用3-氨基丙基三甲氧基硅烷（APMS）水解产物对作为电子传输层（ETL）的致密TiO₂薄膜进行了改性。由APMS水解产物改性TiO₂层构成的PSCs的功率转换效率（PCE）从13.45%提升至15.79%，这与填充因子（FF）从62.23%显著提高到68.04%密切相关。结果表明，APMS水解产物可增强γ-丁内酯（GBL）在TiO₂表面的润湿性，形成完美的CH₃NH₃PbI₃薄膜，并提高界面处的复合电阻。本研究展示了一种简单而高效的TiO₂/钙钛矿界面改进方法，对开发高性能PSCs具有重要意义。