Patent ID: 6472321
Filing Date: 2002-10-29
Classification: H01L

Abstract:
A chemical vapor deposition process, wherein a semiconductor wafer is positioned in a reaction chamber, said process comprising:introducing a set of reactants into said reaction chamber; generating a RF plasma in the vicinity of said semiconductor wafer and regulating temperature and pressure of said reaction chamber; and controlling said introduction of said reactants, said generation of said RF plasma, and said regulation of said temperature and pressure so as to form a primary film over said upper surface region of said insulating layer, over said insulating side wall regions, and over said exposed silicon region of said silicon substrate, wherein said primary film is formed over said upper surface region and said insulating side wall regions according to the following chemical reaction TiCl4+H2â†’Ti+A â€ƒwherein said primary film is formed over said exposed silicon region according to the following chemical reaction TiCl4+H2+Siâ†’TiSi+A â€ƒwhere Si represents silicon present in said silicon substrate and A represents a non-film forming component of said chemical reactions, wherein said primary film is characterized by a first thickness a over said upper surface region and a second thickness b over said exposed silicon region, and wherein said first thickness a is less than said second thickness b.