Patent ID: 9059003
Filing Date: 2015-06-16
Classification: H01L

Abstract:
1. A power semiconductor device comprising: a power semiconductor die, a metal electrode on the power semiconductor die (hereinafter referred to as a die electrode); and another metal electrode to be connected to the die electrode (hereinafter referred to as a connection electrode), wherein the die electrode and the connection electrode are connected with a metal wire by a wedge bonding connection; wherein the metal wire is Ag or Ag alloy wire of which diameter is greater than 50 μm and not greater than 2 mm and the die electrode has thereon one or more layers (hereinafter referred to as electrode coating layer(s)), each of the layer(s) being 50 Å or more in thickness consists of any one metal or an alloy made of two or more metals selected from the group consisting of Ni, Cr, Cu, Pd, V, Ti, Pt, Zn, Ag, Au, W and Al (hereinafter referred to as coating layer metal), wherein the die electrode and the electrode coating layer or the electrode coating layers adjacent to each other are different in their metal composition; wherein in the case where the die electrode is an Al electrode and an outermost surface layer of the electrode coating layer(s) is made of Ag, the die electrode has thereon, under the outermost surface layer of the electrode coating layer(s), one or more electrode coating layers each of which consists of any one metal selected from the coating layer metal except Ag or any alloy consisting of two or more metals selected from the coating layer metal, wherein the die electrode and the electrode coating layer or the electrode coating layers adjacent to each other are different in their metal composition.