Amine-Heterocyclic Leveling Agent for Uniform Copper Plating
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Solution Overview
Problem
Current electroplating bath additives fail to provide uniform copper deposits on substrates with irregular topography, particularly in areas with both through-holes and blind vias, leading to challenges in achieving level copper layers and sufficient throwing power in PCB manufacturing.
Innovation Solution
A reaction product of amine monomers and polymers containing saturated heterocyclic moieties is introduced into the electroplating bath, which acts as a leveling agent to ensure uniform metal deposition across substrates with varying features, enhancing the throwing power of the bath.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional leveling agents are used in electroplating baths, then copper deposition occurs on substrate surfaces, but uniform metal deposit cannot be achieved on substrates with irregular topography and mixed aperture types
Solution Approach 1:
The patent modifies the chemical parameters of the leveling agent by reacting amine monomers with polymers containing saturated heterocyclic moieties to create a derivative compound with altered electrochemical properties. This chemical transformation enables the leveling agent to effectively interact with both through-holes and blind vias, achieving uniform copper deposition across diverse aperture geometries that conventional agents cannot handle
Solution Approach 2:
The invention creates a composite chemical structure by combining amine monomer components with polymer backbones containing saturated heterocyclic moieties. This composite molecule integrates the benefits of both components: the amine group provides leveling functionality while the heterocyclic polymer structure enhances adaptability to different aperture types, resulting in a leveling agent that performs uniformly across mixed via geometries
2Manufacturing precision
If electroplating is performed on substrates with narrow and tall apertures, then copper can be deposited in through-holes, but voltage drop causes uneven deposit thickness between surface and aperture interiors
Solution Approach 1:
The patent alters the electrochemical parameters of the plating system by introducing a leveling agent with modified molecular structure (amine monomer reaction product with heterocyclic polymer). This chemical modification changes the deposition kinetics and voltage distribution characteristics, enabling uniform copper thickness in narrow and tall apertures despite inherent voltage drop effects that plague conventional plating processes
3Productivity
If sequential build up technologies with blind vias are used to maximize via filling, then high density interconnects are achieved, but thickness variation in copper deposit between vias and substrate surface increases
Solution Approach 1:
The invention modifies the chemical parameters of the electroplating bath by incorporating a leveling agent derived from amine monomer-polymer reactions. This chemical change optimizes the deposition profile to achieve both high via filling and uniform copper thickness across the substrate surface, resolving the trade-off between productivity and precision in sequential build up processes
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 provides substantially level metal deposits on substrates with small features and varied aperture sizes, improving the throwing power and reliability of copper plating, even in complex geometries like blind vias and through-holes, with minimal cracking and optimal physical reliability under thermal stress.
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
Data Source
AI summary
Reaction products of amines and polymers containing saturated heterocyclic moieties may be used as levelers in metal electroplating baths. The reaction products may plate metal with good surface properties and good physical reliability.