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Epitaxial Wafer, also known as Epi-wafer, is a silicon wafer that is placed on top of another silicon wafer using the epitaxial technique. Epitaxy is the technique of depositing a monocrystalline silicon layer on a silicon wafer's polished crystal surface. This wafer serves as a semiconducting substrate for microelectronics, photovoltaics, and photonics applications. Epitaxy is a technique for growing or laying a single crystalline film or layer over a crystalline-based semiconductor substrate or surface. In relation to the crystal-based semiconductor substrate, the deposited substance must have defined acclimatization. Furthermore, chip designers use molten or vapor-based foundations to create epitaxial over layers. An epitaxial wafer is a semiconducting substrate wafer that has been grown epitaxially for use in microelectronics, photovoltaics, and photonics. For epitaxial deposition, heteroepitaxy and homoepitaxy are the two most used procedures. Heteroepitaxy deposition is the p