The solution processed FAPbI perovskite usually suffers from chaotic orientations. Herein, a template structure of oriented 2D perovskite is used to obtain a high-quality FAPbI film with (001) preferred orientation by cation exchange. The highly oriented BAPbI serves as a growth template and promotes the (001) orientation of the 3D perovskite. The dominantly (001) orientated FAPbI perovskite exhibits uniform surface morphology and suppressed film defects.
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