Patent ID: 7109127
Filing Date: 2006-09-19
Classification: H01L

Abstract:
1. A manufacturing method of a semiconductor device, comprising the steps of: (a) forming an interlayer insulator mainly composed of an SiOC film on a semiconductor substrate having a conductive layer thereon, and then, forming an alumina mask in which wiring trench forming regions are opened on said interlayer insulator; (b) after said step (a), performing dry etching with using a photoresist film as a mask to form via holes in said interlayer insulator on said conductive layer; (c) removing said photoresist film and then cleaning the inside of said via holes by using hydrofluoric acid; (d) after said step (c), performing dry etching with using said alumina mask as a mask to form wiring trenches in said interlayer insulator; (e) after said step (d), removing said alumina mask; and (f) after said step (e), forming wiring composed of a conductive film mainly made of copper in said via holes and said wiring trenches, thereby electrically connecting said wiring and said conductive layer, wherein the dry etching in said step (d) is performed by using etching gas mainly consisting of carbon tetrafluoride.