Epitaxy Explin and would this be 1 Can we grow epitaxial Al

Epitaxy? Explin and would this be ......................

1. Can we grow epitaxial AlxGai.xAs films on GaAs substrates by Molecular Beam Epitaxy? E Would this be heteroepitaxy r homoepita

Solution

Epitaxy refers to the deposition of a crystalline overlayer on a crystalline substrate.The word epitaxy derives from the Greek prefix epi meaning “upon” or “over” and taxis meaning “arrangement” or “order.”

The process results in the formation of crystalline thin films that may be of the same or different chemical composition and structure as the substrate and may be composed of only one or, through repeated depositions, many distinct layers. In homoepitaxy the growth layers are made up of the samematerial as the substrate, while in heteroepitaxy the growth layers are of a material different from the substrate.This technology is often used to grow crystalline films of materials for which crystals cannot otherwise be obtained and to fabricate integrated crystalline layers of different materials. Examples include silicon on sapphire, gallium nitride (GaN) on sapphire, aluminium gallium indium phosphide (AlGaInP) on gallium arsenide (GaAs) ordiamond or iridium.