Patent ID: 8026610

Claim:
A silicon interposer comprising: a silicon substrate, said silicon substrate having a first surface and a second surface and defining a through hole that extends from said first surface to said second surface; an element portion made of an impurity diffusion layer, the element portion being formed on said first surface of the silicon substrate; a protection film that covers a surface of the element portion and said first surface of said silicon substrate, said protection film being made of a SiN film; a contact portion provided in the protection film and connected to said element portion; a through electrode, said through electrode being received in said through hole and passing through the protection film and the silicon substrate in a thickness direction from said first surface to said second surface; an oxide film formed on inner wall surfaces of the through hole and said second surface of said silicon substrate, said oxide film, which is formed of a material that is different than said SiN film, electrically insulates the through electrode from the silicon substrate; a first plurality of wirings formed on said protection film; and, a second plurality of wirings formed on the second surface of the silicon substrate, wherein one of the first plurality of wirings, which is formed on the protection film, is connected electrically to the element portion via the contact portion.