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

TL;DR

This paper demonstrates a novel method using spinodal decomposition to create epitaxial halide perovskite double heterostructures with reduced electron-phonon coupling, enabling advanced optoelectronic applications.

Contribution

It introduces a new approach to produce coherent halide perovskite heterostructures via spinodal decomposition regulated by photon irradiation.

Findings

Successful synthesis of epitaxial halide perovskite heterostructures.

Observation of reduced Fr"ohlich electron-phonon coupling.

Potential for high-performance optoelectronic devices.

Abstract

Epitaxial III-V semiconductor heterostructures are key components in modern microelectronics, electro-optics and optoelectronics. With superior semiconducting properties, halide perovskite materials are rising as promising candidates for coherent heterostructure devices. In this report, spinodal decomposition is proposed and experimentally implemented to produce epitaxial double heterostructures in halide perovskite system. Pristine epitaxial mixed halide perovskites rods and films were synthesized via Van der Waals epitaxy by chemical vapor deposition method. At room temperature, photon was applied as a knob to regulate the kinetics of spinodal decomposition and classic coarsening. By this approach, halide perovskite double heterostructures were created carrying epitaxial interfaces and outstanding optical properties. Reduced Fr\"ohlich electron-phonon coupling was discovered in coherent halide double heterostructure, which is hypothetically attributed to the classic phonon confinement effect widely existing in III-V double heterostructures. The ability to develop coherent double heterostructures in halide perovskites paves an avenue to exploring halide perovskite-based quantum wells and superlattices for high-performance and low-cost optoelectronics, electro-optics and microelectronics.