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 (1D/3D or 2D/3D) help to improve the stability of PSCs. However, the insulated organic cations of low-dimensional perovskite impede the transport of carriers, decreasing the power conversion efficiency (PCE) of PSCs. Herein, we introduce an in situ cross-linking polymerizable propargylammonium (PA⁺) to the 3D perovskite film at surfaces and grain boundaries to form a 1D/3D perovskite heterostructure. 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.

中文翻译：

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原位交联的1D / 3D钙钛矿异质结构可提高杂化钙钛矿太阳能电池在3000小时以上运行中的稳定性

长期稳定性是钙钛矿太阳能电池（PSC）在商业上可行的基本要求。由低维和三维钙钛矿（1D / 3D或2D / 3D）构建的异质结有助于提高PSC的稳定性。但是，低维钙钛矿的绝缘有机阳离子阻碍了载流子的传输，从而降低了PSC的功率转换效率（PCE）。在此，我们介绍一种原位交联可聚合的炔丙基铵（PA ⁺）到3D钙钛矿膜的表面和晶界处，形成1D / 3D钙钛矿异质结构。这种钝化策略不仅可以显着改善界面载体的传输，还可以释放钙钛矿薄膜中的残余拉伸应变。结果，在最大功率点（MPP）工作条件下连续照明3055小时后，相应的器件实现了21.19％的最佳PCE，同时保持了93％的初始效率。