SUMCO Corporation

Japan

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SUMCO Corporation is a leading global manufacturer specializing in high-purity silicon wafers for the semiconductor industry. Founded on July 30, 1999, through the consolidation of the silicon wafer divisions of Mitsubishi Materials Corporation and Sumitomo Metal Industries, the company is headquartered in Minato-ku, Tokyo, and is listed on the Prime Market of the Tokyo Stock Exchange (TYO: 3436).

SUMCO operates major manufacturing and R&D facilities across Japan—including the Kyushu Factories in Imari, Saga Prefecture, and the Chitose Plant in Hokkaido—alongside international facilities in the United States, Taiwan, and other regions. The company’s production systems comply with stringent international standards:

IATF 16949 (Automotive Quality Management)
ISO 9001 (Quality Management)
ISO 14001 (Environmental Management)
ISO 45001 (Occupational Health and Safety)

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SUMCO produces a comprehensive lineup of monocrystalline silicon ingots and high-precision wafer substrates supporting leading-edge memory, logic, power devices, and analog circuits:

Polished Wafers (PW): Precision-sliced single-crystal silicon wafers with mirror-polished surfaces, manufactured under tight flatness and particle contamination controls for standard semiconductor manufacturing.
Epitaxial Wafers (EW): Wafers featuring a high-purity single-crystal epitaxial silicon layer grown via chemical vapor deposition on a polished substrate, used extensively in logic devices and power semiconductors.
Annealed Wafers: Hydrogen- or argon-annealed silicon wafers engineered to eliminate crystal-originated particles (COP) near the wafer surface for elevated gate oxide integrity.
Silicon-on-Insulator (SOI) Wafers: Substrates engineered with a thin silicon device layer separated from the handle substrate by an insulating silicon oxide layer, optimizing high-speed, low-power microelectronics and RF devices.
Junction-Isolated Wafers & Reclaimed Wafers: Tailored substrate configurations for specialized discrete devices and test/monitoring applications in semiconductor fabrication facilities.

SUMCO Corporation

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