The undesired energy level alignment and charge recombination at the perovskite/carbon electrode interface limit the application of carbon-based perovskite solar cells (C-PSCs). The incorporation of hole transport materials, CuSCN, is an effective strategy to solve this issue. However, the mismatched crystal structure and lattice between the perovskite layer (cubic crystal) and CuSCN layer (hexagonal crystal) lead to a charge transport barrier due to the gaps at the heterogeneous interface. Herein, the interfacial engineering designed on CuSCN has been carried out, which not only improves the quality of perovskite film but also reduces the defects, enhances the interfacial connection, and ensures rapid charge extraction and transfer. After key parameter adjustment, both high efficiency (15.81%) and good stability of C-PSCs have been obtained. After storage for 2,000 h at ambient air environment, devices without any encapsulation could maintain 93% of their initial efficiency. The thermal stability test shows that the encapsulated devices retain 83% of their initial efficiency after storage for 300 h in dry air at 85 °C. Deep insight and mechanisms have been proposed in this interfacial engineering design for improving the efficiency and stability of C-PSCs.

钙钛矿/碳电极界面处不希望的能级排列和电荷复合限制了碳基钙钛矿太阳能电池（C-PSC）的应用。引入空穴传输材料 CuSCN 是解决这一问题的有效策略。然而，钙钛矿层（立方晶体）和 CuSCN 层（六方晶体）之间不匹配的晶体结构和晶格会由于异质界面处的间隙而导致电荷传输势垒。在此，进行了基于CuSCN设计的界面工程，不仅提高了钙钛矿薄膜的质量，而且减少了缺陷，增强了界面连接，确保了电荷的快速提取和转移。经过关键参数调整，C-PSCs 获得了高效率（15.81%）和良好的稳定性。在环境空气环境中储存 2,000 小时后，没有任何封装的设备可以保持其初始效率的 93%。热稳定性测试表明，封装的器件在 85°C 的干燥空气中储存 300 小时后仍保持其初始效率的 83%。在这种界面工程设计中已经提出了深刻的见解和机制，以提高 C-PSC 的效率和稳定性。