摘要:
The present invention relates to a method for increasing the adhesion of organic resist materials on copper or copper alloy surfaces. The copper or copper alloy surface is contacted with an aqueous adhesion promoting solution comprising at least one organic acid, a peroxide compound and optionally one or more substances selected from the group consisting of urea, derivatives thereof and water-soluble polymers.
摘要:
The present invention relates to a method for forming a copper pillar on a semiconducting substrate, the copper pillar having an underbump metallization area comprising a metal less noble than copper and optionally a solder bump on the top portion, and having a layer of a second metal selected from tin, tin alloys, silver, and silver alloys deposited onto the side walls of said copper pillar. A layer of a first metal which is more noble than copper is deposited onto the entire outer surface of the copper pillar prior to deposition of the second metal layer. The layer of a second metal then has at least a reduced number of undesired pin-holes and serves as a protection layer for the underlying copper pillar.
摘要:
The present invention relates to a cyanide-free aqueous immersion-type plating bath for deposition of gold, comprising gold ions, at least one complexing agent, sulfite ions, thiosulfate ions, and at least one ureylene polymer additive. The gold layer deposited from the plating bath according to the present invention shows a lemon-yellow colour and a sufficient wettability for tin based solder materials.
摘要:
Process of electrodepositing a metal in a high aspect ratio via in a silicon substrate to form a through-silicon-via (TSV), utilizing an electrolytic bath including a redox mediator, in an electrolytic metal plating system including a chuck adapted to hold the silicon substrate and to heat the silicon substrate to a first temperature, a temperature control device to maintain temperature of the electrolytic bath at a second temperature, in which the first temperature is maintained in a range from about 30° C. to about 60° C. and the second temperature is maintained at a temperature (a) at least 5° C. lower than the first temperature and (b) in a range from about 15° C. to about 35° C.
摘要:
The present invention relates to a method for manufacture of multilayer printed circuit boards and articles formed thereby, especially IC substrates. The method utilizes a copper-tin alloy layer coated with at least one silane binding agent to provide adhesion between a copper surface and a resin layer after lamination. This method leads to an enhanced adhesive strength, improved mechanical and thermal stress resistance as well as humidity resistance of multilayer printed circuit boards and IC substrates.
摘要:
The present invention concerns an aqueous plating bath composition for electroless deposition of palladium and/or palladium alloys and a method which utilises such aqueous plating bath compositions. The aqueous plating bath comprises a source of palladium ions, a reducing agent, a nitrogenated complexing agent which is free of phosphorous and an organic stabilising agent comprising 1 to 5 phosphonate residues. The aqueous plating bath and the method are particularly useful if the aqueous plating bath comprises copper ions.
摘要:
The present invention is concerned with improved means for etching circuit structures on printed circuit board or wafer substrates of copper or copper alloys in a manner effectively removing unwanted copper from such circuit structures leaving behind a smooth copper surface applying an etching solution containing an Fe(ll) / Fe(lll) redox system and sulfur containing organic additives. It is an advantage of the present invention that the solution can also applied for plating of copper prior to etching.
摘要:
Described is a method of forming a metal or metal alloy layer onto a substrate comprising the following steps i) provide a substrate (102) including a permanent resin layer (103) on top of at least one contact area (101) and a temporary resin layer (104) on top of the permanent resin layer, ii) contact the entire substrate area including the at least one contact area with a solution suitable to provide a conductive layer (106) on the substrate surface and iii) electroplate a metal or metal alloy layer (107) onto the conductive layer.