Patent ID: 6228179
Filing Date: 2001-05-08
Classification: C11D,C23G,H01L

Abstract:
A method for treating a surface of a semi-conductor substrate, which comprises contacting a semi-conductor substrate with a surface treatment composition containing a complexing agent as a metal deposition preventive in a liquid medium, in which the complexing agent is an ethylenediaminephenol derivative of the following general formula (1) or its salt: ##STR3##wherein X.sub.1 and X.sub.2 are hydroxyl groups; Y.sub.1 to Y.sub.8 are respectively independently a hydrogen atom, a hydroxyl group, a halogen atom, a carboxyl group, a phosphonic acid group, a sulfonic acid group, a carbonyl group, a nitro group, a nitroso group, an amino group, an imino group, a nitrilo group, a nitrile group, a thiocyanate group, a hydroxyamino group, a hydroxyimino group, or an alkyl or alkoxy group which may have a substituent, provided that at least one of Y.sub.1 to Y.sub.8 is not a hydrogen atom; Z.sub.1 to Z.sub.4 are respectively independently a hydrogen atom, a carboxyl group, a --CH.sub.2 COOH or a phosphonic acid group; and R.sub.1 to R.sub.4 are respectively independently a hydrogen atom or an alkyl group which may have a substituent wherein said liquid medium contains an alkaline component selected from the group consisting of ammonia, quaternary ammonium salt hydroxides, potassium hydroxide, sodium hydroxide, calcium hydroxide, sodium hydrogen carbonate and ammonium hydrogen carbonate, a concentration of formula (1) complexing agent from 10.sup.-7 to 5 wt % and a metal impurity concentration per each metal of at most 10.sup.-4 wt %.