The anisotropy of perovskite (PVK) crystals is important for charge carrier transport and light absorption. In this regard, organic small molecules are most commonly used to induce the orientation growth of PVK. However, the high volatility and high diffusion coefficient of small molecules hinders its practical application. Here, inorganic layered double hydroxide nanosheets (LDHs-NS) is introduced into the PVK solution, where both micro and macro anisotropy of LDHs-NS guide the anisotropic growth of PVK crystals. Based on this, the efficiency of assembled perovskite solar cells (PSC) in an all-air environment can reach 12.26% with excellent thermal stability. The orderly arrangement of –OH on LDHs-NS surfaces can induce orderly growth of PVK crystals by interacting with Pb²⁺; the anisotropy stacking of LDHs-NS ensured the orderly growth of PVK crystals on a large scale. Our work has important guiding implications for the anisotropy growth of PVK crystal, resulting in more efficient PSCs.

钙钛矿 (PVK) 晶体的各向异性对于电荷载流子传输和光吸收很重要。在这方面，有机小分子最常用于诱导 PVK 的定向生长。然而，小分子的高挥发性和高扩散系数阻碍了其实际应用。在这里，无机层状双氢氧化物纳米片 (LDHs-NS) 被引入到 PVK 溶液中，其中 LDHs-NS 的微观和宏观各向异性引导 PVK 晶体的各向异性生长。基于此，组装的钙钛矿太阳能电池（PSC）在全空气环境下的效率可以达到12.26%，具有优异的热稳定性。^{–OH在LDHs-NS表面的有序排列可以通过与Pb 2+}的相互作用诱导PVK晶体的有序生长; LDHs-NS的各向异性堆积保证了PVK晶体的大规模有序生长。我们的工作对 PVK 晶体的各向异性生长具有重要的指导意义，从而产生更高效的 PSC。