Patent ID: 7737027
Filing Date: 2010-06-15
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: forming a first interlayer insulating film on a surface of a semiconductor substrate; forming a second interlayer insulating film on a surface of the first interlayer insulating film; performing patterning on a resist film applied on a surface of the second interlayer insulating film; using the resist film as a mask, isotropically etching the first interlayer insulating film and the second interlayer insulating film to a preselected depth to form an opening for a contact hole followed by anisotropically etching the first interlayer insulating film and the second interlayer insulating film to form the contact hole having an upper part with a sloped surface and a lower part extending from the upper part and up to the surface of the semiconductor substrate; forming a barrier metal layer on an inner wall of the contact hole and on the surface of the second interlayer insulating film; depositing a protective film made of an insulating film on a surface of the barrier metal layer; performing anisotropic etching to the protective film to leave the insulating film having a side wall shape so as to cover the surface of the barrier metal layer formed on a side wall of the contact hole, and the surface of the barrier metal layer formed on a side bottom surface of a contact hole, which corresponds to a junction between a side wall of the contact hole and a bottom surface of the contact hole; depositing an interconnecting material on the insulating film of the side wall shape, the barrier metal layer, and the surface of the second interlayer insulating film; and etching the barrier metal layer and the interconnecting material into a desired shape.