Patent ID: 11859153
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  F  H | IPC B  C  F  H

Claim 0:
1. A method for cleaning a substrate, comprising:
removing impurities on a surface of the substrate by exposing the substrate to a first cleaning agent;
removing the first cleaning agent on the surface of the substrate by exposing the substrate to a dewetting chemical agent in a liquid phase;
solidifying the dewetting chemical agent in the liquid phase remaining on the surface of the substrate, to obtain the dewetting chemical agent in a solid phase; and
sublimating and removing the dewetting chemical agent in the solid phase;
wherein the removing the first cleaning agent on the surface of the substrate by exposing the substrate to a dewetting chemical agent in a liquid phase comprises:
controlling the substrate to spin at a first speed, spraying the dewetting chemical agent in the liquid phase on the surface of the substrate, to dissolve the first cleaning agent remaining on the surface of the substrate in the dewetting chemical agent in the liquid phase; and
controlling the substrate to spin at a second speed, to remove part of the dewetting chemical agent in the liquid phase on the surface of the substrate, wherein the second speed is less than the first speed;
wherein the exposing the substrate to the first cleaning agent comprises:
controlling the substrate to spin at a third speed, and spraying the first cleaning agent on the surface of the substrate; and
controlling the substrate to spin at a fourth speed, and spraying the second cleaning agent on the surface of the substrate to remove the first cleaning agent on the surface of the substrate;
wherein the solidifying the dewetting chemical agent in the liquid phase remaining on the surface of the substrate, to obtain the dewetting chemical agent in the solid phase comprises:
controlling the substrate to spin at a fifth speed, and controlling a temperature and/or a pressure of a chamber, to bring the temperature of the chamber lower than a freezing point of the dewetting chemical agent in the liquid phase under the pressure of the chamber, and to solidify the dewetting chemical agent in the liquid phase remaining on the substrate into the dewetting chemical agent in the solid phase; and
the removing the dewetting chemical agent in the solid phase comprises:
controlling the substrate to spin at a sixth speed, and controlling the temperature and/or pressure of the chamber, to bring the temperature of the chamber higher than a sublimation point of the dewetting chemical agent in the solid phase under the pressure of the chamber, and to sublimate the dewetting chemical agent in the solid phase to the dewetting chemical agent in a gas phase;
wherein each of the first speed, the third speed and the fourth speed is greater than the sixth speed, and the sixth speed is greater than the second speed and the fifth speed.