We introduce a facile method to form a well-deposited [6], [6]-phenyl-C₆₁-butyric acid methyl ester (PCBM) film on the surface of 2D perovskite by mixing the poly[(9,9-bis(3′-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9–dioctylfluorene)] (PFN), which can benefit the film formation of PCBM as well as improve the electron extraction efficiency of electron transport layer (ETL). As a result, the optimized group presents an enhanced photovoltaic performance with power conversion efficiency of 12.7%, which is attributed to the improved interfacial contact and better matched energy alignment. It is observed that the fully covered and dense ETL (PCBM:PFN) leads to a better environmental stability of devices in ambient air condition without encapsulation.

我们引入了一种简便的方法，通过混合聚[[9,9-bis（）在2D钙钛矿表面上形成沉积良好的[6]，[6]-苯基-C _61-丁酸甲酯（PCBM）膜3'-（（N，N-二甲基氨基）丙基）-2,7-芴）-alt-2,7-（9,9-二辛基芴）]（PFN），可有益于PCBM的成膜并改善电子传输层（ETL）的电子提取效率。结果，优化的组呈现出增强的光伏性能，功率转换效率为12.7％，这归因于界面接触的改善和能量匹配的更好匹配。可以观察到，完全覆盖且密集的ETL（PCBM：PFN）可以在不封装的情况下在环境空气条件下提高设备的环境稳定性。