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Electrolytic copper plating solutions

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TLDR
In this article, a copper electroplating composition with high aspect ratio and small diameter microvias is described. But the method for use of the compositions and products formed by the compositions is not described.
Abstract
The present invention provides inter alia copper electroplating compositions, methods for use of the compositions and products formed by the compositions. Electroplating compositions of the invention contain an increased brightener concentration that can provide effective copper plate on difficult-to-plate aperture walls, including high aspect ratio, small diameter microvias.

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References
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Electro deposition chemistry

TL;DR: In this paper, the authors provide plating solutions, particularly metal plating solution, designed to provide uniform coatings on substrates and to provide substantially defect free filling of small features, e.g., micron scale features.
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Electrodeposition of copper from acid baths

H Creutz
TL;DR: A bath for electrodepositing ductile, lustrous copper which comprises an aqueous acidic copper plating bath containing dissolved therein a brightening amount of the reaction product of polyethyleneimine and an alkylating agent which will alkylate the nitrogen of the polyethylenimine to produce a quaternary nitrogen as mentioned in this paper.
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TL;DR: In this article, a chemical mechanical polishing pad has a neck region at the top of the groove, where the groove side walls are substantially parallel, which provides a margin for the pad to wear during polishing without affecting the pad's surface area.