Patent ID: 9748092
Date: 2017-08-29
CPC Classifications: B08B,C09K,C11D,H01L

Claim:
1. A process for cleaning a surface of a wafer having a finely uneven pattern at the surface and containing silicon element at at least a part of the uneven pattern, comprising the step of: retaining a liquid chemical for forming a water-repellent protecting film, at least on surfaces of recessed portions of the uneven pattern, thereby forming a water-repellent protecting film at least on the surfaces of the recessed portions of the uneven pattern, wherein the liquid chemical comprises: a silicon compound A represented by the following general formula [1] where R at least one acid selected from the group consisting of trimethylsilyl trifluoroactate, trimethylsilyl trifluoromethanesulfonate, dimethylsilyl, trifluoroactate, dimethylsilyl trifluoromethanesulfonate, butyldimethylsilyl trifluoroactate, butyldimethylsilyl trifluoromethanesulfonate, hexyldimethylsilyl trifluoroactate hexyldimethylsilyl trifluoromethanesulfonate, octyldimethylsilyl trifluoroactate, octyldimethylsilyl trifluoromethanesulfonate, decyldimethylsilyl trifluoroactate and decyldimethylsilyl trifluoromethanesulfonate.