Patent ID: 8124457

Claim:
A method for manufacturing a semiconductor device having a structure wherein a semiconductor element and a wiring circuit layer are laminated, the wiring circuit layer comprising an insulating layer, a conductive layer provided in the insulating layer, a connecting conductor part on one face of the insulating layer, wherein the connecting conductor part is connected to an electrode of the semiconductor element, and an externally-connecting conductor part on the other face of the insulating layer, wherein the externally-connecting conductor part is for connecting to an external conductor, wherein the connecting conductor part and the externally-connecting conductor part are connected to each other via the conductive layer, the insulating layer comprises a lamination structure having a base insulating layer on a metal support substrate side and an insulating layer on a semiconductor element side, and a conductive path extends from the conductive layer to the metal support substrate side and the tip of the conductive path constitutes the externally-connecting conductor part, the method comprising the steps of: forming the wiring circuit layer having the connecting conductor part that is connected to the electrode of the semiconductor element, in a way such that, on the metal support substrate comprising a release layer, the wiring circuit layer is peeled from the metal support substrate, and the connecting conductor part is exposed on the upper surface of the wiring circuit layer, laminating the wiring circuit layer on the semiconductor element while in a wafer state to connect the connecting conductor part of the wiring circuit layer and the electrode of the semiconductor element, and separating the metal support substrate from the wiring circuit layer after the connection, wherein prior to the forming step of the wiring circuit layer, an opening in the release layer is formed wherein the location of the opening corresponds to the location of the externally-connecting conductor part of the wiring circuit layer, in the forming step of the wiring circuit layer, the base insulating layer having an opening is formed, wherein the location of the opening corresponds to the location of the opening of the release layer, on the surface of the metal support substrate exposed in the coincident openings, a metal film for preferred electrical connection and increased corrosion resistance is formed, and then, filling the coincident openings with a metal material to form the conductive path, which forms a structure of the metal film covering the surface of the externally-connecting conductor part of the wiring circuit layer.