In-situ Cross-linked 1D/3D Heterojunction Improves Stability of Hybrid Perovskite Solar Cells for Over 3000h Operation
【摘要】：Long-term stability is an essential requirement for perovskite solar cells(PSCs) to be commercially viable. Heterojunctions built by low-dimensional and three-dimensional perovskites(1 D/3 D or 2 D/3 D) help to improve the stability of PSCs. However, the insulated organic cations of low-dimensional perovskite impede carriers transport, decreasing the power conversion efficiency(PCE) of PSCs. Herein, we introduce an in-situ cross-linking polymerizable propargyl ammonium(PA+) to the 3 D perovskite film at surfaces and grain boundaries to form the 1 D/3 D stacking perovskite. This passivation strategy not only significantly improves the interfacial carrier transport but also releases residual tensile strain in perovskite films. As a result, the corresponding devices achieve a champion PCE of 21.19%, while maintaining 93% of their initial efficiency after 3055 h of continuous illumination under maximum power point(MPP) operating conditions.