Patent ID: 11862697
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. The method for manufacturing the buried gate of claim 1, wherein growing the epitaxial layer on the exposed trench sidewall with the epitaxial growth process comprises:
drying the substrate in an environment at a temperature of 605° C. to 705° C.;
baking the substrate by elevating the temperature to 840° C. to 860° C. and charging hydrogen;
performing the epitaxial growth process for a preset period after lowering the temperature to 715° C. to 725° C. and lowering a pressure to 9 torr to 11 torr, and then charging epitaxial growth reaction gases;
restoring the pressure to a barometric pressure, and restoring the temperature to 605° C. to 705° C., to complete the epitaxial growth process; and
filling the isolation layer in the trench.