Patent ID: 8198730
Filing Date: 2012-06-12
Classification: H01L

Abstract:
1. A semiconductor device, comprising: an insulating film formed on a semiconductor substrate, an interconnection film containing copper as a principal component and being formed in a predetermined area in the insulating film, and a liner film in contact with the interconnection film, the semiconductor device having a multilayer interconnection including at least one layer formed of the interconnection film, wherein the interconnection film containing copper as a principal component is a polycrystalline film including crystal grains oriented to (111) in a substrate thickness direction, and the liner film is a noble metal film having oxidation resistance under normal pressure and temperature and being oriented so as to have a close-packed orientation surface on its face, wherein the liner film is a Ru film oriented so as to have a close-packed orientation surface on its face, wherein crystal grains occupying 40% or more of an area of a unit interconnection surface among the crystal grains forming the polycrystal are oriented to (111) in a substrate thickness direction in case where the liner film is the Ru film, and a standard deviation of diameters of the crystal grains is 0.5 μm or less, wherein a high-melting-point metal film is formed between the liner film and the insulating film, and wherein the liner film is formed between the interconnection film and the high-melting-point metal film.