Copper Electroplating Bath Leveling Agents for Uniform Deposit
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Solution Overview
Problem
Current copper electroplating baths struggle to achieve uniform copper deposits on substrates with irregular topography, particularly in areas with both through-holes and blind vias, due to inadequate throwing power and excessive nodule formation.
Innovation Solution
The development of copper electroplating baths containing reaction products of amines, polyacrylamides, and sultones, which enhance throwing power and reduce nodule formation by providing a leveling effect across substrates, including those with small features and varied aperture sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional leveling agents are used in copper electroplating baths, then uniform copper deposit is achieved on substrate surface, but throwing power is insufficient and nodule formation is excessive
Solution Approach 1:
The patent modifies the chemical composition parameters of the electroplating bath by introducing reaction products of amines, polyacrylamides, and sultones as new leveling agents. These compounds change the chemical environment and interact with copper ions and substrate surfaces in novel ways, achieving both uniform deposit and high throwing power simultaneously.
Solution Approach 2:
The patent employs composite chemical systems by combining multiple functional components: amine-based compounds, polyacrylamide derivatives, and sultone reaction products work synergistically in the electroplating bath. This composite approach allows different parts of the deposit formation process to be optimized simultaneously.
2Manufacturing precision
If conventional leveling agents are used in copper electroplating baths, then uniform copper deposit is achieved on substrate surface, but nodule formation is excessive
Solution Approach 1:
The patent converts the potentially harmful effect of excessive nodule formation into a benefit by using reaction products of sultones that specifically inhibit nodule growth while maintaining uniform deposit. The sultone derivatives act as selective suppressors of nodule formation, transforming a defect into a controlled feature.
Solution Approach 2:
The patent changes the chemical parameters of the plating bath by introducing specific compounds from the reaction products of amines, polyacrylamides, and sultones. These parameter changes alter the deposition kinetics and thermodynamics to prevent nodule formation while maintaining surface uniformity.
3Adaptability or versatility
If electroplating is performed on substrates with irregular topography including small features and varied aperture sizes, then complex geometries are processed, but voltage drop causes uneven metal deposit
Solution Approach 1:
The patent applies local quality by using leveling agents that provide differential control over the deposit formation at different locations on the substrate. The reaction products of amines, polyacrylamides, and sultones create localized chemical environments that compensate for voltage drops in different regions, ensuring uniform deposit thickness across complex geometries.
Solution Approach 2:
The patent introduces intermediary compounds (reaction products of amines, polyacrylamides, and sultones) that mediate between the electrical field variations and the deposit formation process. These intermediaries absorb and distribute the voltage drop effects, preventing direct translation into uneven deposit thickness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively deposits copper with high throwing power and reduced nodules, ensuring a substantially level surface across substrates, even in complex geometries, thereby improving the uniformity and quality of copper layers in electronic devices.
Implementation Method 1
Methods for electroplating articles with metal coatings generally involve passing a current between two electrodes in a plating solution where one of the electrodes is the article to be plated
Implementation Method 2
Leveling agents are often used in copper plating baths to provide substantially uniform, or level, copper layers in electronic devices
Data Source
AI summary
Copper electroplating baths include reaction products of amines, polyacrylamides and sultones. The reaction products function as levelers and enable copper electroplating baths which have high throwing power and provide copper deposits with reduced nodules.