SMTA International Conference Proceedings

Copper Pillar Plating Systems High Speed - Low Heat

Authors: E.Walch, DJ., C.Rietmann, Ph.D., A.Angstenberger, Ph.D.
Company: MacDermidEnthone Electronic Solutions
Date Published: 9/17/2017   Conference: SMTA International

Abstract: This present paper deals with the ever-more stringent requirements of to-date Interconnect Technologies (ICT) from die through final assembly in particular as far as digital and analog high frequencies, undistorted signal propagation and efficient heat propagation are concerned. From waferlevel packaging to the finished Printed Circuit Board copper pillars, solid copper posts (with Printed Circuitry it´s copper filled Through Holes respectively) continue to play a vital role in coping with high speed/frequency and high wattage of sub and final assemblies.

Commonly used packaging concepts comprising waferlevel plating, through-silicon-vias (TSV), redistribution layer design (RDL), intermediate pillars, macrobumps and copper filled through holes in the final circuitry are being roughly sketched followed by an overlook of the extremely different pillar geometries within each packaging level posing individual challenges on the copper plating chemistry and process. Practical aspects namely dialling in the chemistry additives and process windows to match the relevant applications´ needs will be shortly reported, the ongoing R&D work targeted for current and future requirements to be presented.This paper concludes with actual research results on achievable copper textures and the subsequent performance of the plated copper interconnects as far as crystal lattices, and the related thermal reliability are concerned.

Key Words: 

copper pillar plating, thermal vias, plating additives, copper texture, copper reliability

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