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

Abstract 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.