Patent ID: 8395057

Claim:
Wafer assembly, comprising: a substrate comprising a wafer or a stack of wafers; and an electrical connection arranged through at least a part of said substrate, wherein said electrical connection is made by low-resistance silicon, wherein said electrical connection is provided separately from said substrate with at least one protrusion and mechanically positioned in a hole of said substrate afterwards, penetrating at least a part of said substrate, wherein a surface of said substrate confining said hole is electrically insulating, wherein at least one protrusion of said electrical connection protrudes transversal to a main extension of said hole, wherein said protrusion is protruding outside a minimum hole diameter as projected in said main extension of said hole, wherein said protrusion is supported by a support surface of said substrate; wherein said support surface of said substrate is a recessed surface portion of said substrate; wherein at least one end of said electrical connections is contained within a main surface plane of the wafer or stack of wafers; wherein an end of said electrical connection is soldered to said support surface; wherein the solder material surrounds at least one said protrusion, and is in direct contact with at least a portion of said support surface.