Patent ID: 11959004
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Semiconductors (Electrical engineering)
Classification: CPC C  H | IPC C  H

Claim 1:
2. The method of claim 1, wherein exposing the semiconductor substrate to the alkaline etching solution comprises submerging the semiconductor substrate in a volume of the alkaline etching solution, and wherein the volume of the alkaline etching solution has a temperature in a range of from about 0° C. to about 15° C. below a boiling point of the alkaline etching solution, and wherein a composition of the alkaline etching solution is maintained substantially constant for a duration of the exposing via intermittent or continuous removal of a portion of the alkaline etching solution and replacement thereof with about a same volume of a fresh solution, wherein the fresh solution comprises at least one of the hydroxide salt, the polyol, and the water, such that a substantially constant etching rate of the unmasked surfaces is maintained for the duration.