Patent ID: 8361598

Claim:
An electrical structure comprising: a first substrate; a first dielectric layer formed over a top surface of said first substrate, wherein said first dielectric layer comprises a first opening extending from a top surface through a bottom surface of said first dielectric layer and a second opening extending from a top surface through a bottom surface of said first dielectric layer; a first solder structure formed within said first opening and over a portion of said top surface of said first dielectric layer, wherein said first solder structure comprises a solder material, wherein said first solder structure is not electrically connected to said first substrate; a first metallic pad comprising a first section formed within said second opening and in direct mechanical contact with an electrically conductive pad; a barrier layer structure comprising a first barrier layer formed over and in contact with said first metallic pad and a second barrier layer formed over and in contact with said first barrier layer; an underfill layer comprising a silica-epoxy composite adhesive material, wherein said underfill layer is formed over said top surface of said first dielectric layer and over said first solder structure, wherein said underfill layer is formed over said top surface of said first dielectric layer and over said solder structure, wherein a first portion of said dielectric layer is formed between said solder structure and said barrier layer structure, wherein said first portion of said dielectric layer is in direct mechanical contact with a bottom surface of said first barrier layer, a first surface of said first metallic pad, and a second surface of said first metallic pad, wherein said underfill layer is in direct mechanical contact with said first portion of said dielectric layer, a second portion of said dielectric layer, said first solder structure, said first barrier layer, and said second barrier layer; a second substrate formed over and in contact with said underfill layer, wherein said second substrate is not in contact with said first solder structure, and wherein a portion of said underfill layer is formed in contact with and between a bottom surface of said second substrate and a top surface of said first solder structure; and a barrier layer formed within said first opening between a portion of said first solder structure and said first dielectric layer, wherein said first opening extends through said top surface of said first substrate and within an opening within said first substrate, wherein said barrier layer is formed within a portion of said opening, wherein said first solder structure is further formed within said opening, and wherein said barrier layer is further formed between said first solder structure and said first substrate within said opening.