Patent ID: 9142443
Filing Date: 2015-09-22
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising the steps of: (a) preparing a semiconductor substrate; (b) forming a first insulating film over the main surface of the semiconductor substrate; (c) forming an element isolating trench in the first insulating film and the semiconductor substrate by plasma dry etching of the first insulating film and the semiconductor substrate; (d) forming a second insulating film over the main surface of the semiconductor substrate so as to fill the trench; (e) removing the second insulating film outside the trench by CMP, while leaving the second insulating film in the trench; (f) after step (e), removing the first insulating film by wet etching to expose the semiconductor substrate, the first insulating film being wet etched while applying light of 140 lux or greater to the first insulating film; (g) after step (f), implanting a dopant into the semiconductor substrate to form a well; and (h) after the step (g), forming a gate insulating film of a MISFET over the well.