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Epitaxial III-V semiconductor heterostructures are key components in modernmicroelectronics, electro-optics and optoelectronics. With superiorsemiconducting properties, halide perovskite materials are rising as promisingcandidates for coherent heterostructure devices. In this report, spinodaldecomposition is proposed and experimentally implemented to produce epitaxialdouble heterostructures in halide perovskite system. Pristine epitaxial mixedhalide perovskites rods and films were synthesized via Van der Waals epitaxy bychemical vapor deposition method. At room temperature, photon was applied as aknob to regulate the kinetics of spinodal decomposition and classic coarsening.By this approach, halide perovskite double heterostructures were createdcarrying epitaxial interfaces and outstanding optical properties. ReducedFr\"ohlich electron-phonon coupling was discovered in coherent halide doubleheterostructure, which is hypothetically attributed to the classic phononconfinement effect widely existing in III-V double heterostructures. Theability to develop coherent double heterostructures in halide perovskites pavesan avenue to exploring halide perovskite-based quantum wells and superlatticesfor high-performance and low-cost optoelectronics, electro-optics andmicroelectronics.

Spinodal Decomposition-Enabled Halide Perovskite Double Heterostructure with Reduced Fr\"ohlich Electron-Phonon Coupling