Wet anisotropic etching of silicon
    10.
    发明授权

    公开(公告)号:US11959004B2

    公开(公告)日:2024-04-16

    申请号:US17339474

    申请日:2021-06-04

    CPC classification number: C09K13/02 C09K13/00 H01L21/30604 H01L21/308

    Abstract: An alkaline etching solution comprising a hydroxide salt (e.g., an alkali metal hydroxide, an ammonium hydroxide, or a combination thereof), a polyol having at least three hydroxyl (—OH) groups, and water. Also provided is a method of producing a semiconductor device by obtaining a semiconductor substrate having masked and unmasked surfaces; exposing the semiconductor substrate having the masked and unmasked surfaces to an alkaline etching solution, such that the unmasked surfaces of the substrate are anisotropically etched, wherein the alkaline etching solution comprises: a hydroxide salt; a polyol having at least three hydroxyl (—OH) groups; and water; and performing additional processing to produce the semiconductor device.

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