Sapphire Substrate Chips Have Been Widely Used in LED Industry.
Apr 20, 2022
LED epitaxial substrate material is the foundation of semiconductor lighting industry technology development.
LED epitaxial substrate material is the foundation of semiconductor lighting industry technology development. Different substrate materials need different LED epitaxial growth technology, chip processing technology and device packaging technology, substrate material determines the development of semiconductor lighting technology. The basic principle of LED epitaxial wafer growth is that InGaAlP, a gaseous substance, is transported to the substrate surface controlled by a substrate heated to an appropriate temperature, which is mainly sapphire, SiC and Si, to grow a specific single crystal film.
Epitaxial wafer growth mainly depends on the growth process and equipment. The main method for manufacturing epitaxial wafers is metal-organic chemical vapor deposition (MOCVD), but even this "most economical" method is very difficult to manufacture. Internationally, only a very limited number of enterprises in Germany, the United States, The United Kingdom, Japan and other countries can carry out commercial production. The epitaxial wafer material is mainly silicon, and silicon epitaxial wafer is also the main body of current epitaxial wafer. The world polysilicon, silicon monocrystalline and silicon wafer and other epitaxial wafer manufacturing materials are almost all shin-Etsu, MEMC, Wacker, Mitsubishi and other companies control, these four companies share nearly 70% of the market. In recent years, the basic pattern of domestic epitaxial film market is that foreign-funded enterprises dominate the product technology, and local manufacturers gradually rise.
In the LED industry chain, the production of midstream LED chips is the key technology of LED, with high technology content, high equipment investment intensity and relatively high profit margin. It is a typical capital-intensive and technology-intensive industry. At present, the first group of LED chips in the world is represented by Japanese, European and American manufacturers. The second group represented by South Korean and Taiwanese manufacturers; The third camp is represented by mainland Chinese manufacturers.
