公开(公告)号：US20190062943A1

公开(公告)日：2019-02-28

申请号：US16086756

申请日：2017-03-10

Applicant: MOMENTIVE PERFORMANCE MATERIALS INC.

Inventor： Richard Lee Hansen

IPC: C30B15/10 ,  C30B29/06 ,  C30B35/00 ,  C03C10/00

Abstract: The present technology provides a devitrification agent for crucibles with improved efficiency over previous devitrification agents for use in various technological fields, including semiconductors and photovoltaic applications. The devitrification agent may include (a) barium, and (b) tantalum, tungsten, germanium, tin, or a combination of two or more thereof. The devitrification agent may be integrated into a crucible during construction, applied to the surface of a finished crucible, and/or added into the silicon melt used in crystal pull. The technology described herein, improves sag resistance and provides a devitrified surface for slower, more controlled dissolution of silica by liquid silicon melt during silicon crystal growth.