Patent ID: 8580649
Filing Date: 2013-11-12
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising: etching a semiconductor substrate using a silicon nitride mask film formed on the semiconductor substrate as a mask to form a first isolation trench corresponding to a first isolation region; forming a liner silicon nitride film on at least an inner surface of the first isolation trench; depositing a flowable silazane compound by a CVD method such that the first isolation trench is filled with the flowable silazane compound by overfilling up to a height higher than the upper surface of the silicon nitride mask film in the vicinity of the first isolation trench; heat-treating the flowable silazane compound under an oxidizing atmosphere to convert the flowable silazane compound into a first silicon oxide and to densify the first silicon oxide; and planarizing the first silicon oxide to the height of the upper surface of the silicon nitride mask film.