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The third generation of semiconductor materials AlN belongs to the direct bandgap semiconductor, its bandwidth of 6.2 eV, with high thermal conductivity, resistivity, breakdown field strength, as well as excellent chemical and thermal stability, is not only an important blue light, ultraviolet materials, or electronic devices and integrated circuits, important packaging, dielectric isolation and insulation materials, especially for high-temperature 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.

The process of isostatic graphite manufacturing is Selecting raw materials, Blending, Molding, Isostatic pressing, Carbonization, Graphitization. 

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.

The fabrication of semiconductor devices primarily encompasses four types of processes: (1) Photolithography (2) Doping Techniques (3) Film Deposition (4) Etching Techniques The specific techniques involved include photolithography, ion implantation, rapid thermal processing (RTP), plasma-enhanced chemical vapor deposition (PECVD), sputtering, and both dry and wet etching methods.

In the realm of semiconductor device fabrication, the precise control of crystal growth is paramount for achieving high-quality and reliable devices. One technique that has played a pivotal role in this domain is Liquid-Phase Epitaxy (LPE).