Patent ID: 6707157
Filing Date: 2004-03-16
Classification: H01L

Abstract:
A semiconductor device, comprising:a semiconductor substrate having a first surface and a second surface opposite the first surface, and having a piercing hole piercing there-through from the first surface to the second surface; an insulating film formed on the first surface of the semiconductor substrate having the piercing hole extended there-through; and a piercing electrode formed in the piercing hole and extending from the insulating film to the second surface, wherein the piercing hole is formed by using the insulating film as an etching mask; the piercing hole has a first diameter in the insulating film and a second diameter in the semiconductor substrate which is wider than the first diameter; the piercing electrode has a substantially same diameter as the first diameter along a whole length thereof; and an insulating film sleeve lies only between the piercing electrode and an inside wall of the piercing hole in the semiconductor substrate.