Organic–inorganic hybrid perovskite materials with mixed organic cations (FA_xMA_(1-x)PbI₃) have attracted intensive attention due to their superior optoelectronic properties. In this work, the FA_0.3MA_0.7PbI₃ perovskite film were synthesized and applied in perovskite solar cells (PSCs) based on carbon counter electrode (CCE). And a passivation approach for the perovskite/CCE interface is presented, using cetyltrimethylammonium bromide (CTAB). The quaternary amine and bromine ion of CTAB can fill the vacancy defects of FA/MA and iodine ion, respectively, leading to a more hydrophobic and smoother surface than the untreated film. The optimum device based on 0.5 mg/ml CTAB exhibited an short-circuit current density of 23.68 mA·cm⁻² with a power conversion efficiency of 12.69%, which is superior to PSCs without CTAB. The long-term stability test in ambient atmosphere with 40% relative humidity reveals the higher stability of PSCs with the surface passivation, which is favorable for its commercial application.

具有混合有机阳离子的有机-无机杂化钙钛矿材料 (FA _x MA _(1-x) PbI ₃ ) 因其优异的光电性能而备受关注。在这项工作中，FA _0.3 MA _0.7 PbI ₃合成了钙钛矿薄膜并将其应用于基于碳对电极（CCE）的钙钛矿太阳能电池（PSC）。并提出了一种使用十六烷基三甲基溴化铵 (CTAB) 的钙钛矿/CCE 界面钝化方法。CTAB 的季胺和溴离子可以分别填充 FA/MA 和碘离子的空位缺陷，从而导致比未处理的薄膜更疏水和更光滑的表面。^{基于0.5 mg/ml CTAB的最佳器件表现出23.68 mA·cm -2}的短路电流密度和12.69%的功率转换效率，优于没有CTAB的PSC。在相对湿度为40%的环境大气中进行的长期稳定性测试表明，经过表面钝化处理的PSCs具有更高的稳定性，有利于其商业化应用。