Sumco Techxiv Corporation

Syunji Nonaka

Kozo Nakamura

Yutaka Shiraishi

Shiro Yoshino

Shinya Sadohara

Ryota Suewaka

A method in which SSDs are reliably reduced while reducing void defects other than the SSDs on a wafer surface, which is essential for an annealed wafer, and ensuring that BMDs serving as gettering source in a bulk are generated, in order to stabilize the quality of the annealed wafer. Considering that annealing a silicon wafer leads to an increase of density (quantity) of deposits associated with oxygen and nitrogen and forming a core of the SSDs, SSDs are decreased by reducing the density (quantity) of the deposits associated with oxygen and nitrogen by controlling three parameters of oxygen concentration, nitrogen concentration and cooling concentration during the process of pulling and growing the silicon single crystalbefore annealing. Alternatively, SSD is reduced by polishing after annealing.

Growing community of inventors

Omura, Japan

Syunji Nonaka