Patent ID: 7829975

Claim:
A chip for use in a multichip semiconductor device comprising: a semiconductor substrate having a surface on which circuit components are formed; a first interlayer insulating film formed above the surface of the semiconductor substrate; a connect plug made of a metal and formed in a through hole that passes through the first interlayer insulating film and the semiconductor substrate; a second interlayer insulating film formed on the first interlayer insulating film; and a metal interconnection which passes through the second interlayer insulating film and which connects to a portion of the connect plug, an area of the portion being smaller than a cross-sectional area of the connect plug, wherein the connect plug includes a metal plug formed in the through hole and having a cavity, an insulating film formed between the metal plug and a sidewall of the through hole, and a film formed in the cavity, the film being smaller than the metal plug in a difference in thermal expansion coefficient from the semiconductor substrate.