title: Epitaxial Halide Perovskite Lateral Double Heterostructure.
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 Fröhlich 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. As a proof-of-concept, our results suggest that halide perovskite-based epitaxial heterostructures may be promising for high-performance and low-cost optoelectronics, electro-optics, and microelectronics. Thus, ultimately, for practical device applications, it may be worthy to pursue these heterostructures via conventional vapor phase epitaxy approaches widely practised in III-V field.
authors.forename: Yiping
authors.initials: Y
authors.lastname: Wang
authors.forename: Zhizhong
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Cavendish Laboratory, University of Cambridge , Cambridge CB3 0HE, United Kingdom.
authors.forename: Felix
authors.initials: F
authors.lastname: Deschler
authors.forename: Xin
authors.initials: X
authors.lastname: Sun
authors.forename: Toh-Ming
authors.initials: TM
authors.lastname: Lu
authors.forename: Esther A
authors.initials: EA
authors.lastname: Wertz
authors.affiliation: Department of Materials Science and Engineering, University of Wisconsin , Madison, Wisconsin 53705, United States.
authors.forename: Jia-Mian
authors.initials: JM
authors.lastname: Hu
authors.forename: Jian
authors.identifier: 0000-0003-2115-2225
authors.initials: J
authors.lastname: Shi
keywords: coarsening; double heterostructures; halide perovskites; nucleation; spinodal decomposition