Patent ID: 9524926
Filing Date: 2016-12-20
CPC Classification: H01L

Claim Text:
1. A method of substrate surface modification, comprising: providing at least one pre-fabricated metal lead frame or package substrate (substrate) unit comprising a base metal having a die pad and a plurality of contact regions surrounding said die pad; additively depositing an ink comprising a material that is a solid or a precursor for a solid that forms a solid upon a curing step or a sintering step in a liquid carrier onto at least one of (i) a region of said die pad and (ii) at least one region of a first of said plurality of contact regions (first contact region), and sintering or curing said ink to remove said liquid carrier to form an ink residue; wherein said additively depositing then said sintering or said curing forms said ink residue in a pattern of islands which maintains at least one non-modified metal surface region on said die pad and at least one non-modified metal surface region on said first contact region; wherein said material comprise a dielectric material, and wherein said pattern of islands is a pattern of plating stop islands, further comprising: plating a metal layer between said pattern of plating stop islands, and removing said pattern of plating stop islands to form a plurality of metal pillars.