Patent ID: 7741714
Filing Date: 2010-06-22
Classification: H01L

Abstract:
1. A bond pad structure, comprising: a first metal layer formed on an integrated circuit substrate; a passivation layer formed over said first metal layer and having at least one first opening that exposes at least part of said first metal layer; a first interposed, single-material layer, a stress-buffering, single-material layer, and a second interposed, single-material layer successively deposited along a bottom and sidewalls of said first opening; and a bond pad layer deposited over and directly contact the second interposed, single-material layer; wherein said stress-buffering, single-material layer has a property selected from the group consisting of Young's modulus, hardness, strength and toughness greater than that of at least one of said first metal layer and said bond pad layer, and is deposited directly on said first interposed, single-material layer along the bottom and sidewalls of said first openings; said first interposed, single-material layer serves as a metal-diffusion barrier layer directly on said first metal layer, and conformally lines said bottom and said sidewalls of said first opening; and said second interposed, single-material layer serves as a metal-diffusion barrier layer-directly on said stress-buffering, single-material layer.