Patent ID: 7439192

Claim:
A method of forming a thin layer on a semiconductor substrate, comprising: forming a first layer on the substrate at a first temperature of below about 550°C. in a processing chamber through an atomic layer deposition (ALD) process; and forming a second layer on the first layer at a second temperature of above about 550°C. in the processing chamber through a chemical vapor deposition (CVD) process, wherein forming the first layer includes: providing a first reactant of titanium chloride into the processing chamber, so that a monolayer is formed on the substrate by a chemisorption of the first reactant to the substrate; providing a first purge gas into the processing chamber, so that a portion of the first reactant that is not chemisorbed to the substrate is removed from the processing chamber; providing a second reactant of ammonia (NH 3 ) gas or nitrogen (N 2 ) gas into the processing chamber, so that the first layer is formed on the substrate by a chemisorption of the second reactant to the monolayer; and providing a second purge gas into the processing chamber, so that a portion of the second reactant that is not chemisorbed to the monolayer and residual gases are removed from the processing chamber.