Perovskite solar cells (PSCs) are promising alternatives toward clean energy because of their high-power conversion efficiency (PCE) and low materials and processing cost. However, their poor stability under operation still limits their practical applications. Here we design an innovative approach to control the surface growth of a low dimensional perovskite layer on top of a bulk three-dimensional (3D) perovskite film. This results in a structured perovskite interface where a distinct layered low dimensional perovskite is engineered on top of the 3D film. Structural and optical properties of the stack are investigated and solar cells are realized. When embodying the low dimensional perovskite layer, the photovoltaic cells exhibit an enhanced PCE of 20.1% on average, when compared to pristine 3D perovskite. In addition, superior stability is observed: the devices retain 85% of the initial PCE stressed under one sun illumination for 800 hours at 50 °C in an ambient environment.

中文翻译：

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层状钙钛矿的选择性生长，用于稳定高效的光伏电池†

钙钛矿太阳能电池（PSC）由于其高功率转换效率（PCE）以及低廉的材料和加工成本，因此有望成为清洁能源的替代产品。然而，它们在操作下的差的稳定性仍然限制了它们的实际应用。在这里，我们设计了一种创新的方法来控制块状三维（3D）钙钛矿薄膜顶部的低维钙钛矿层的表面生长。这产生了结构化的钙钛矿界面，其中在3D膜的顶部设计了独特的分层低维钙钛矿。研究了电池堆的结构和光学特性，并实现了太阳能电池。当体现低维钙钛矿层时，与原始3D钙钛矿相比，光伏电池的平均PCE增强了20.1％。此外，