How about Dingxing Tongmei Crystal?

Yes, Baoding Tongmei Crystal Manufacturing Co., Ltd. is a newly registered company and a wholly-owned enterprise of AXTI Group (website www.axt.com, listed on NASDAQ) in the United States. The company is located in Dingxing County, Baoding City, Hebei Province, with a registered capital of 29,565,438 US dollars and an area of 76,000 square meters. The company is mainly engaged in the production and processing of gallium arsenide, indium phosphide and germanium single wafers, and the manufacture of III-V compounds and single crystal germanium semiconductor substrate materials. The products are mainly used in mobile phones, satellite broadcasting, radar systems, lasers, optical fiber communication, radiation and optical detectors, aerospace solar energy and other fields, and 90% of the products are exported to Europe, America, Japan, South Korea, Southeast Asia, Taiwan Province Province and other regions.

The technical level and management level of AXT company are in the same position, and the whole production process represents the international advanced level of contemporary compound semiconductor materials, which is still blank in China. Only a few countries in the world have this technology, such as the United States, Germany and Japan. These technologies mainly include vertical gradient condensation compound semiconductor crystal growth technology, tool-free wire cutting technology, ultra-flat mechanochemical polishing technology, ultra-clean surface cleaning technology, pollution-free technology that can store wafers for a long time, ultra-thin high-strength germanium wafer processing technology and so on. These are all major technical problems in the field of compound semiconductors.