Patent ID: 6614113
Filing Date: 2003-09-02
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor substrate; a plurality of electrode pads provided on said semiconductor substrate; a plurality of protruding electrodes corresponding to said plurality of electrode pads and; a plurality of barrier metal structures, each including a plurality of conductive metal layers interconnecting one of the plurality of electrode pads and a corresponding one of the plurality of protruding electrodes thereto; wherein an uppermost one of the plurality of conductive metal layers of the barrier metal structure, which is in contact with said protruding electrode, includes a covering portion that covers a side wall surface of a middle one of the plurality of conductive metal layers thereunder; wherein the uppermost one of the plurality of conductive metal layers resists diffusion/oxidation of the plurality of protruding electrodes and the middle one of the plurality of conductive metal layers is not in contact with an insulating layer thereunder and does not resist diffusion/oxidation of the plurality of protruding electrodes but is separated from the plurality of protruding electrodes by the covering portion, wherein said protruding electrode includes a conductive metal containing at least one of tin (Sn) and lead (Pb) or of an alloy of tin (Sn) and lead (Pb), wherein the covering portion of the uppermost one of the plurality of conductive metal layers is provided such that the covering portion covers side walls of only the middle one of the plurality of conductive metal layers.