Patent ID: 6416814
Filing Date: 2002-07-09
Classification: C03C

Abstract:
A process for the chemical vapor deposition (CVD) of a metal oxide film onto a heated substrate, said process comprisinga) selecting as a metal oxide CVD precursor compound a CVD precursor comprising a compound of the structure MXnL2 whereM is Sn or Zn; L is selected from the group consisting of methylformate, ethylformate, n-propylformate, i-propyl formate, n-butylformate, i-butylformate, t-butylformate, and mixtures thereof; X is Cl and n is 4 when M is Sn; and X is R and n is 2 when M is Zn, whereR is C1-8 lower alkyl or C2-8 lower alkenyl; and when M is Sn, the ethyl formate ligands are positioned cis to each other, or a titanium compound which is a 1:1 or 2:1 C1-4 alkylformate complex of titanium tetrachloride; b) vaporizing said CVD precursor compound to form a CVD precursor vapor; c) contacting said CVD precursor vapor with a heated substrate having a temperature in excess of 400Â° C.; and d) cooling said heated substrate contacted with said CVD precursor vapor to obtain a substrate having a film of metal oxide substantially of the formula MOn/2 or, when the CVD precursor is said titanium compound, TiO2.