Patent ID: 6339019
Filing Date: 2002-01-15
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, comprising:the first step of forming a lower interconnection on a semiconductor substrate having a first insulating film thereon; the second step of forming a second insulating film on said semiconductor substrate including said lower interconnection; the third step of forming a through hole in said second insulating film to reach said lower interconnection; the fourth step of etching, after the third step is ended, a surface of said lower interconnection including a side surface thereof exposed to a bottom portion of the through hole, said fourth step taking place without exposing said semiconductor substrate to the atmosphere; the fifth step of forming a plug made of a conductive material in the through hole; and the sixth step of forming an upper interconnection to be connected to said plug on said second insulating film; wherein the third step comprises the step of forming the through hole by dry etching using a first plasma of a fluorine-containing gas in a vacuum vessel evacuated to a predetermined vacuum degree, and the fourth step comprises the step of removing the first plasma used in the third step in said vacuum vessel and thereafter generating a second plasma of an inert-gas to etch said surface of said lower interconnection exposed to said bottom portion of the through hole; wherein the fourth step comprises the step of generating the second plasma with a lower power than that applied for generating the first plasma.