Patent ID: 6146467
Filing Date: 2000-11-14
Classification: H01L,Y10S

Abstract:
A method for treating a semiconductor substrate comprising:(a) oxidizing and reducing the semiconductor substrate by immersing the semiconductor substrate in an aqueous solution of NH.sub.4 OH and H.sub.2 O.sub.2 ;(b) oxidizing the semiconductor substrate from step a) by immersing the semiconductor substrate in an aqueous solution of a compound selected from the group consisting of ozone, nitric acid, hydrogen peroxide, and mixtures thereof;(c) reducing the oxidized semiconductor substrate from step b) by immersing the semiconductor substrate in a first aqueous solution of a mixture of hydrofluoric acid and a compound selected from the group consisting of an organic acid containing a carboxyl group and a salt of the organic acid;(d) rinsing the reduced semiconductor substrate from step c) by immersing the semiconductor substrate in a second aqueous solution of a mixture of hydrofluoric acid and a compound selected from the group consisting of an organic acid containing a carboxyl group and a salt of the organic acid; and(e) reoxidizing the rinsed semiconductor substrate from step d) by immersing the semiconductor substrate in an aqueous solution of a compound selected from the group consisting of ozone, nitric acid, hydrogen peroxide, and mixtures thereof.