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Epitaxial wafers have been used in the electronics industry for decades, but their importance has only increased as technology has advanced. In this article, we will explore what epitaxial wafers are and why they are such an essential component of modern electronics.

AlN, as third-generation semiconductor material, is not only an important blue light and ultraviolet light material, but also an important packaging, dielectric isolation and insulation material for electronic devices and integrated circuits, especially suitable for high-temperature and high-power devices. In addition, AlN and GaN have a good thermal match and chemical compatibility, AlN used as GaN epitaxial substrate, can significantly reduce the defect density in GaN devices, improve device performance.

Epitaxial growth refers to the process of growing a crystallographically well-ordered monocrystalline layer on a substrate. Generally speaking, epitaxial growth involves the cultivation of a crystal layer on a single-crystal substrate, with the grown layer sharing the same crystallographic orientation as the original substrate. Epitaxy is extensively utilized in semiconductor manufacturing, such as the production of epitaxial silicon wafers in the integrated circuit industry.

Silicon carbide ceramics offer numerous advantages in the optical fiber industry, including high-temperature stability, low thermal expansion coefficient, low loss and damage threshold, mechanical strength, corrosion resistance, good thermal conductivity, and low dielectric constant. These properties make SiC ceramics an ideal material for fiber optic sensors, lasers, and high-power optical fiber applications. As demand in the optical fiber field increases, the application prospects for silicon carbide ceramics will become increasingly prominent.

Gallium Nitride (GaN) epitaxial wafer growth is a complex process, often utilizing a two-step method. This method involves several critical stages, including high-temperature baking, buffer layer growth, recrystallization, and annealing. By meticulously controlling the temperature throughout these stages, the two-step growth method effectively prevents wafer warping caused by lattice mismatch or stress, making it the predominant fabrication method for GaN epitaxial wafers globally.

The degree of graphitization is an essential measure used to assess how close carbon atoms are to forming a tightly-packed hexagonal graphite crystal structure.