Sumitomo Metal Industries, Inc.

Junji Horii

Takayuki Kubo

Manabu Nishimoto

Masahiko Okui

Shingo Kizaki

Makoto Ito

Kazuyuki Egashira

Tadami Tanaka

Shunji Kuragaki

A method of producing a high-quality silicon single crystal of a large diameter and a long size in a good yield by controlling the positions where ring-like oxygen-induced stacking faults (R-OSF) occur in the crystal faces and minimizing grown-in defects such a dislocation clusters and infrared scattering bodies that are introduced in the pulling step. Wafers produced from the above-high-quality silicon single crystal contain little harmful defects that would deteriorate device characteristics and can be effectively adapted to larger scale integration and size reduction of the devices. Therefore, the method can be extensively utilized in the field of producing semiconductor silicon single crystals.

High-quality silicon single crystal and method of producing the same

The present invention was achieved in order to provide an apparatus for pulling a single crystal with which a single crystal having a low density of grown-in defects called infrared scatterers, dislocation clusters or the like can be grown. In the apparatus for pulling a single crystal having a crucible to be charged with a melt, a heater arranged around the crucible, a straightening vane in the shape of a side surface of an inverted truncated cone or a cylinder surrounding a pulled single crystal and a heat shield plate for inhibiting the radiant heat from diverging upward in the chamber from the side surface of the pulled single crystal located in the vicinity of the melt surface are arranged.

Single crystal pull-up apparatus

Growing community of inventors

Saga, Japan

Junji Horii