Synergistic enhancement and mechanism study of mechanical and moisture stability of perovskite solar cells introducing polyethylene-imine into the CH3NH3PbI3/HTM interface

摘要: High performance perovskite solar cells with high stability in moist air are required for their practical applications. We have developed a simple approach to enhance device via the introduction of polyethyleneimine (PEI) compatibilizer between (CH3NH3PbI3) and upper hole transporting material layers (HTMs). The PEI effectively reduces moisture intrusion into CH3NH3PbI3 layer under humidity condition. Moreover, incorporation increases adhesion at CH3NH3PbI3/HTM interface, which allows protective HTMs strongly adhere onto during degradation significantly decreases direct exposure air. As result, cell was found exhibit remarkably improved stability, maintaining 85% 14 days relative without any encapsulation. investigated effects on properties demonstrated first time that strong results is not only mechanically stable but also exhibits long-term stability.