Patent ID: 7276386

Claim:
A method of manufacturing a semiconductor device provided with first electrodes formed on a semiconductor substrate and second protruded electrodes provided on said first electrodes, respectively, said method comprising the steps of: a) forming a barrier metal on each one of said plurality of first electrodes, said step a) further comprising the sub-steps of: forming a first metal coating, which will become a lowermost conductive metal layer, on substantially an entire surface on said semiconductor substrate, said first metal coating having a layered structure of one or more layer having a comparatively good joining property with said first electrodes; forming a second metal coating, which will become a part of said intermediate conductive metal layer, on said first metal coating, said second metal coating having a layered structure of one or more layer having a comparatively good joining property with said first metal coating; forming third conductive metal layers, which will become a part of said intermediate conductive metal layer, by forming a resist provided with openings at positions corresponding to said first electrodes and having areas greater than the areas of the first electrodes, then forming third conductive metal layers in said openings such that the third conductive metal layers cover the second conductive metal layer, said third metal conductive layers having layered structure of one or more layer having a comparatively good joining property with said second metal coating and to a fourth conductive metal layers; forming said fourth conductive metal layers, which will become an upper most conductive metal layer, on said third conductive metal layer, said fourth conductive metal layers having layered structure of one or more layer which easily alloys with the material of the second protruded electrodes and has resistance to oxidation; and forming a first conductive metal layer and a second conductive metal layer by removing said first conductive metal coating and second conductive metal coating while using the third conductive metal layer and fourth conductive metal layer as masks; b) forming said second protruded electrodes on said barrier metals; and c) implementing one or more predetermined test on said semiconductor substrate by applying signals to said semiconductor substrate, wherein said step c) is carried out after said step a) and before said step b).