Patent ID: 8071460
Filing Date: 2011-12-06
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: forming a first film directly on a semiconductor substrate; forming a second film on the first film; removing a region of the second film by a first etching step to form an opening that exposes the first film; patterning the exposed first film by a second etching step separate and independent from the first etching step to expose a surface of the semiconductor substrate through the first film directly over the exposed surface of the semiconductor substrate; and thereafter etching the second film and the exposed surface of the semiconductor substrate simultaneously using the patterned first film as a mask and in an etching ambient having a low etching rate for the first film and having a high etching rate for the second film and the semiconductor substrate until the second film is almost completely etched and a detection amount of a monitored element of the first film increases.