Patent ID: 11869774
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  C | IPC C  H

Claim 0:
1. A method for improving an etching rate of wet etching used in an etching reaction chamber for etching work, the etching reaction chamber being connected with an etchant supply mechanism, the etchant supply mechanism being connected with a water supply mechanism, comprising:
injecting water into the etchant supply mechanism by the water supply mechanism according to a change range of pH of an etchant in the etchant supply mechanism to ensure that a hydrogen ion concentration and a fluoride ion concentration of the etchant in the etchant supply mechanism are stable;
wherein
the etchant is composed of water, ammonium fluoride, hydrogen fluoride, and a surfactant; and
illuminating in the etching reaction chamber with yellow light having a wavelength of 570 nm-590 nm.