Patent ID: 11603485

Abstract:
A surface treatment method of a Si element-containing wafer including, during a cleaning process of the wafer, forming a water-repellent protective film on at least the recess portion of the uneven pattern by supplying a vapor of a composition containing a water-repellent protective film-forming component and a solvent in a state that a liquid is retained in at least the recess portion of the uneven pattern, changing the vapor of the composition into a liquid and replacing the liquid retained in the recess portion with the liquid of the composition. The water-repellent protective film-forming component consists of a compound of formula [1], and the solvent contains at least an acyclic carbonate. R1x(CH3)3-xSiN(R2)2  [1] R1 is selected from the group consisting of a H and a C1-C10 hydrocarbon group; x is an integer of 1 to 3; and R2 is each independently a group selected from the group consisting of methyl, ethyl and acetyl.