Patent ID: 7528068
Filing Date: 2009-05-05
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising: forming a first hole at a side of a main face of a semiconductor substrate; forming a barrier film made of an insulating material on an inner wall of said first hole; forming a first plug in said inside portion of said first hole by embedding a first metal film in said inside portion of said first hole, wherein said first plug comprises first metal film and said barrier film; forming a second hole by selectively removing said semiconductor substrate from a side of a rear surface of said semiconductor substrate so as to expose a portion of said first plug in an inside portion of said second hole; adhering an insulating material selectively to a region other than said first plug exposed in said second hole; exposing at least a portion of said first metal film of the side surface of said first plug by removing at least a portion of the exposed barrier film; and forming a second plug including a portion of said first plug by growing selectively a second metal film to fill said inside portion of said second hole, wherein said side surface of said first plug contacts with said second metal film and said first plug protrudes into said second hole.