Atomic Palladium Coating for Adhesive Electroless Copper Seeding
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Solution Overview
Problem
Existing methods for depositing metals like Cu, Ag, and Au on dielectric substrates are expensive, complex, and require special facilities and skilled personnel, while colloidal and ionic palladium catalysts lack the ability to deposit a conductive layer effectively.
Innovation Solution
Atomic palladium deposition using a metal organic palladium precursor in an organic solvent system, activated by thermal or radiation energy, to form a conductive layer on dielectric substrates without surface treatment, combined with amides or adhesives for enhanced adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PVD, CVD, or sputtering techniques are used to deposit metal layers, then the quality and conductivity of the deposited layer is improved, but the equipment complexity and operational difficulty increase significantly
Solution Approach 1:
The patent replaces complex mechanical vacuum deposition systems (PVD, CVD, sputtering) with a simple chemical solution-based approach. The metal layer is deposited using a liquid precursor solution that can be applied via conventional coating methods, eliminating the need for elaborate vacuum equipment and specialized facilities while achieving comparable deposition quality.
Solution Approach 2:
The invention uses simple, inexpensive chemical solutions that can be easily prepared and applied without requiring expensive, maintainable equipment. The precursor solutions are straightforward chemical formulations that can be handled with basic laboratory equipment, making the process accessible without specialized engineering infrastructure.
2Ease of manufacture
If colloidal or ionic palladium catalysts are used, then the substrate can be activated for electroless deposition, but the adhesion strength and conductivity of the deposited layer are insufficient
Solution Approach 1:
The patent changes the chemical parameters of the palladium catalyst by using organometallic precursor complexes instead of traditional colloidal or ionic palladium. This parameter change in the chemical formulation enables simultaneous achievement of strong adhesion and electrical conductivity, properties that were previously mutually exclusive with simple activation methods.
Solution Approach 2:
The invention employs composite organometallic precursor formulations that combine palladium with organic ligands and solvents. This composite approach creates a catalyst system that provides both the activation function and the adhesion enhancement, while the organic components facilitate the deposition of conductive metal layers.
3Productivity
If conventional electroless deposition chemistries are used with palladium catalyst, then copper and nickel can be deposited, but additional surface treatments (sweller and Desmear) are required which increase process complexity
Solution Approach 1:
The patent merges the catalyst activation function and the adhesion promotion function into a single organometallic precursor deposition step. This consolidation eliminates the need for separate sweller and Desmear treatment steps, reducing the overall process complexity while maintaining the ability to deposit electroless metals effectively.
Solution Approach 2:
The organometallic precursor deposition performs preliminary surface modification and catalyst activation in one step, preparing the substrate for subsequent electroless deposition without requiring intermediate surface treatment steps. This preliminary action encompasses multiple functions that would otherwise require separate processing steps.
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 method enables cost-effective, efficient deposition of a conductive palladium layer with strong adhesion on dielectric substrates, suitable for electroless copper deposition, without the need for elaborate equipment or skilled labor.
Implementation Method 1
the substrate is heated by convection, conduction or radiation resulting in the generation of atomic palladium layer on the substrate
Implementation Method 2
An effective alternative to both colloidal and ionic palladium catalyst deposition is atomic palladium deposition on the dielectric substrate to act as a catalyst
Implementation Method 3
Atomic palladium is generated by a metal organic palladium precursor dissolved in an organic, mixed organic or mixed aqueous organic solvent system. This solution is coated on the substrate and then the substrate is heated
Data Source
AI summary
Methods and systems for forming a palladium film having an amide species are described. An ink or a precursor solution is prepared to include a palladium carboxylate, an ester solvent, and an amine. The ink or the precursor solution is applied to a substrate. The applied solution is activated using one or more of thermal, infrared, ultraviolet, X-ray, coherent, or non-coherent radiation. Activating the solution deposits palladium and a monomeric or polymeric amide on the substrate, such that the deposited palladium or amide is suitable for the deposition of electroless copper on a dielectric.