Patent ID: 9281178
Filing Date: 2016-03-08
CPC Classification: B08B,C09D,C11D,H01L

Claim Text:
1. A method for cleaning a surface of a silicon wafer using a cleaning system comprising: (a) a water-based cleaning liquid; and (b) a water-repellent cleaning liquid for providing at least a recessed portion of the uneven pattern with water repellency during a cleaning process; the method comprising the steps of: wherein the water-based cleaning liquid is selected from the group consisting of water, and a mixture of 50 mass % or more water and at least one kind of an organic solvent acid, and alkali; wherein the water-repellent cleaning liquid comprises a mixture of a water-repellent compound and an organic solvent, the water-repellent compound having a hydrophobic group and a reactive moiety chemically bondable to Si element in the silicon wafer, the organic solvent containing at least an alcoholic solvent; wherein the water-repellent compound comprises at least one selected from the group consisting of the following general formulas [1] and [2],