Patent ID: 6159865
Filing Date: 2000-12-12
Classification: C11D,H01L

Abstract:
A method for preparing a wafer treating solution comprising:adding water to a stock solution comprising at least one surfactant selected from the group consisting ofC.sub.n H.sub.2n+1 ph(SO.sub.3 H)Oph(SO.sub.3 H) or a salt thereof,C.sub.n H.sub.2n+1 phO(CH.sub.2 CH.sub.2 O).sub.m SO.sub.3 H or a salt thereof, andC.sub.n H.sub.2n+1 O(CH.sub.2 CH.sub.2 O).sub.m SO.sub.3 H or a salt thereof,wherein ph is a phenylene group, n is 5 to 20, m is 0 to 20, dissolved in a stock aqueous solution of 20 to 60 wt % hydrogen fluoride (hydrogen fluoride and water total 100 wt % in said stock aqueous solution), wherein the concentration of said at least one surfactant in said wafer treating solution is 0.1 to 1000 ppm, to obtain said wafer treating solution,wherein said wafer treating solution comprises at least one surfactant selected from the group consisting ofC.sub.n H.sub.2n+1 ph(SO.sub.3 H)Oph(SO.sub.3 H) or a salt thereof,C.sub.n H.sub.2n+1 phO(CH.sub.2 CH.sub.2 O).sub.m SO.sub.3 H or a salt thereof, andC.sub.n H.sub.2n+1 O(CH.sub.2 CH.sub.2 O).sub.m SO.sub.3 H or a salt thereof,wherein ph is a phenylene group, n is 5 to 20, m is 0 to 20, dissolved in an aqueous solution of 0.1 to 5 wt % hydrogen fluoride (hydrogen fluoride and water total 100 wt % in said aqueous solution), wherein the concentration of said at least one surfactant in said wafer treating solution is 0.01 to 100 ppm,wherein said at least one surfactant in said stock solution is the same as said at least one surfactant in said wafer treating solution.