Abstract
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.
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