Patent ID: 7326438
Filing Date: 2008-02-05
Classification: C23C,H01L

Abstract:
1. A method for depositing a nitride film by chemical vapor deposition using a chemical vapor deposition apparatus of single chamber type having a process chamber comprising a inlet gas line through which process gases are introduced; a shower head for spraying the introduced process gases; a heater on which a wafer is placed; and a vacuum port for discharging the process gases, the method comprising the steps in sequence of: a first step of depositing a first nitride film on the lower, side and upper regions of a patterned trench formed on a wafer by performing a first nitride film deposition process using a process gas at a first mixture ratio of ammonia (NH a second step of depositing a second nitride film on a surface of the first nitride film in-situ by maintaining a process gas at a second mixture ratio of ammonia gas and silane gas different from the first mixture ratio and in the range of 100:1 or less in order to secondly deposit the nitride film, after depositing the first nitride film, wherein a pressure in the chamber is maintained in the range between 10 and 350 torr, whereupon the first and second nitride films deposited together have a greater thickness at the upper region as compared to the side regions and the lower region thereof.