Patent ID: 8889563
Filing Date: 2014-11-18
Classification: B81C,H01L

Abstract:
1. A method for etching a silicon oxide layer of a semiconductor substrate, the method comprising: placing a semiconductor substrate having a structure formed thereon onto a platform of a reaction chamber; etching a silicon oxide layer of the semiconductor substrate by supplying dense carbon dioxide into the reaction chamber and injecting an etchant; discharging fluid inside the reaction chamber from a lower part of the reaction chamber by injecting supercritical helium to an upper part of the reaction chamber, after etching the silicon oxide layer of the semiconductor substrate; discharging the supercritical helium from an upper part of the reaction chamber by injecting dense carbon dioxide to a lower part of the reaction chamber; and drying the semiconductor substrate by decompressing an inside of the reaction chamber; wherein the dense carbon dioxide is within a temperature range of 20° C. to 100° C. and within a pressure range of 5.52 MPa to 34.5 MPa.