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Efficient Interfacial Synthesis Strategy for Perovskite CsPbBr3 Nanorods in the Biphase Solution

1D APbX3 (A = Cs, MA, FA, X = Cl, Br, I) nanorods (NRs) show potential for the future integrated optoelectronic devices as the ideal building blocks due to their outstanding optoelectronic performances. However, there is still a lack of high‐efficiency controllable strategies to synthesize CsPbX3 NRs. An interfacial synthesis strategy is shown here to fabricate CsPbBr3 NRs by inserting Pb2+ into postsynthetic CsBr nanocrystals in vortex method at the water‐hexane interface. The water phase can intrinsically separate from the hexane phase in such a system and take away excess Pb2+ and other side reaction salts. Additionally, without additional ligand assisted growth, the whole reaction system could result in a very clean surface of CsPbBr3 NRs, eliminating the further purification process. The new approach for interfacial synthesis paves the way for efficient synthesis of CsPbBr3 nanorods.