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Determination of Electroless Copper Stabilizer with Hydrochlorofluorocarbon

IP.com Disclosure Number: IPCOM000118206D
Original Publication Date: 1996-Nov-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Adl, TP: AUTHOR [+5]

Abstract

Disclosed is a novel analytical procedure for the determination of an organic additive in an electroless copper plating chemistry. This additive is used as a stabilizer in the plating chemistry, and quantitative analysis and control of the stabilizer is important for overall process control of the plating process. In addition, control of the stabilizer is essential to control defect levels in the plated product to avoid defects in Plated Through Holes (PTHs) of printed circuit boards or related products.

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Determination of Electroless Copper Stabilizer with Hydrochlorofluorocarbon

      Disclosed is a novel analytical procedure for the determination
of an organic additive in an electroless copper plating chemistry.
This additive is used as a stabilizer in the plating chemistry, and
quantitative analysis and control of the stabilizer is important for
overall process control of the plating process.  In addition, control
of the stabilizer is essential to control defect levels in the plated
product to avoid defects in Plated Through Holes (PTHs) of printed
circuit boards or related products.

      Determination of the additive was previously performed by a
method which used methylene chloride, a suspected carcinogen, to
extract the additive from a sample of the plating solution.
Ultraviolet/Visible (UV/Vis) spectrophotometry is then used to
quantitatively determine the organic additive levels for appropriate
process control.  The methylene chloride solvent does not interfere
with the spectral absorption of the analyte due to its low UV
absorption cutoff.

      The described procedure uses a Hydrochlorofluorocarbon (HCFC)
solvent for extraction of the additive prior to spectrophotometric
quantitative analysis and as the non-interfering solvent for the
spectrophotometric determination.  HCFCs can be available either in
pure or commercial forms and are intended as direct replacements for
methylene chloride.  HCFCs also offer the advantage of much lower
Ozone Deplet...