Patent ID: 8957005
Filing Date: 2015-02-17
Classification: C11D,H01L

Abstract:
1. A cleaning agent for substituting a cleaning liquid retained in recessed portions of a silicon wafer having a finely uneven pattern at its surface with another cleaning liquid, said cleaning agent comprising: a) a water-based first cleaning liquid; and b) a water-repellent second cleaning liquid for imparting water repellency at least to the recessed portions of the uneven pattern during a cleaning process, said water-repellent second cleaning liquid comprising: wherein the water-repellent second cleaning liquid is retained in the recessed portions formed at the surface of the silicon wafer to provide said recessed portions with water repellency; the amount of the acid catalyst is 0.001-5 mass % relative to the total quantity of 100 mass % of the water-repellent second cleaning liquid; any water retained in the recessed portions has a capillary force not higher than 2.1 MN/m the water-repellent substance comprises at least one compound selected from the group consisting of: where and compounds represented by the following formula [3]: