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Metal halide perovskites (MHPs) have emerged as a new class of colloidal semiconductor nanomaterials due to their fascinating optoelectronic properties and potential applications. However, the intrinsic lattice defects and phase instability are still dilemmas that limit their further applications. This paper provides an updated review of the synthesis strategy of MHPs based on surface engineering, including encapsulation, passivation, and repair. This surface engineering approach could protect MHPs from degradation in the external environment, stabilize the crystal structure and reduce surface defects of perovskites. With these treatments, the MHPs present improved optical and photoactive phase stability. However, traditional colloidal perovskite nanocrystals (NCs) are synthesized through a single reaction phase, leading to tedious purification and ionization processes. We intend to comprehensively study how surface engineering affects the optical properties of NCs. Furthermore, we provide new insights into the interface engineering of perovskite nanocrystals which could inspire potential future directions for preparing MHP NCs in multiphase colloidal solutions of this domain. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]