Patent ID: 6032682
Filing Date: 2000-03-07
Classification: B08B,C11D,G03F,H01L

Abstract:
A method for stripping ashed photoresist material from an exposed surface of a semiconductor wafer comprising:(a) preparing an initial bath solution consisting essentially of sulfuric acid (H.sub.2 SO.sub.4);(b) adding hydrogen peroxide (H.sub.2 O.sub.2) to the initial bath solution to produce a processing bath solution, the rate of addition of the hydrogen peroxide being from about 0.015 to about 1.5 g H.sub.2 O.sub.2 (anhydrous basis)/min./liter of the processing bath solution;(c) processing the semiconductor wafers through the processing bath solution by contacting the surfaces of the semiconductor wafers with the processing bath solution and removing ashed photoresist material from the semiconductor wafers, wherein the processing bath solution has a temperature of about 90.degree. C. during the processing of the semiconductor wafers; and(d) maintaining the rate of hydrogen peroxide addition during the processing of the semiconductor wafers.