Single Solution Activating Polymer Surface for 3D IC Vias
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Solution Overview
Problem
Current methods for metallization of through wafer vias in three-dimensional integrated circuits require multiple solutions and treatments to achieve excellent adhesion between layers, particularly when using an organic polymer insulating dielectric layer and copper germination layer via an electroless route, which is inefficient and complex.
Innovation Solution
A single solution combining palladium complexes, a binder with glycidyl or isocyanate functions, and a solvent system is used to activate the polymer surface, allowing for subsequent electroless deposition of a copper germination layer with improved adhesion, including the use of organosilane compounds for mixed substrate structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple solutions and treatments are used to activate the polymer surface for electroless copper deposition, then adhesion between layers is improved, but process complexity increases
Solution Approach 1:
The patent combines multiple activation functions into a single solution containing palladium complex, binder with glycidyl or isocyanate functions, and solvent system. This single solution performs surface activation, adhesion promotion, and catalytic site formation simultaneously, eliminating the need for multiple separate treatments while maintaining excellent adhesion between the polymer insulating layer and electroless copper layer
Solution Approach 2:
The activation solution is designed to be universal for both pure polymer surfaces and mixed substrate structures (polymer and oxide areas). The solution adapts to different substrate types through its multifunctional composition, providing consistent activation and adhesion promotion across various surface compositions without requiring different process formulations
2Device complexity
If a single solution is used to activate the polymer surface, then process complexity is reduced, but adhesion quality may be compromised
Solution Approach 1:
The activation solution employs a composite formulation combining palladium complex (for catalytic activity), binder with glycidyl or isocyanate functions (for adhesion promotion through chemical bonding to polymer and metal oxides), and appropriate solvent system. This composite approach within a single solution ensures excellent adhesion quality by providing multiple mechanisms of bond formation simultaneously
Solution Approach 2:
The binder with glycidyl or isocyanate functions acts as an intermediary between the polymer insulating layer and the electroless copper layer. It forms chemical bonds with both the polymer surface and the metal oxide intermediates, creating a strong adhesive bridge that ensures reliable adhesion while being delivered through a single activation solution
3Reliability
If conventional activation methods are used for mixed substrate structures, then adhesion is maintained, but the process requires additional organosilane treatment steps
Solution Approach 1:
The patent integrates the organosilane treatment function into the single activation solution. The solution contains components that simultaneously activate polymer surfaces, treat oxide areas, and promote adhesion, eliminating the need for separate organosilane treatment steps while maintaining adhesion quality on mixed substrate structures
Solution Approach 2:
The activation solution is designed to be universally effective on both polymer and oxide surface areas of mixed substrate structures. It provides consistent activation and adhesion promotion across different surface compositions in a single treatment step, improving manufacturing efficiency by eliminating the need for selective area treatments
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
This approach simplifies the process by providing excellent adhesion between layers, enhancing the manufacturing efficiency and quality of through wafer vias in three-dimensional integrated circuits, particularly for substrates with both polymer and oxide areas.
Implementation Method 1
A single solution combining palladium complexes, a binder with glycidyl or isocyanate functions, and a solvent system is used to activate the polymer surface, allowing for subsequent electroless deposition of a copper germination layer
Implementation Method 2
A single solution combining palladium complexes, a binder with glycidyl or isocyanate functions, and a solvent system is used to activate the polymer surface
Implementation Method 3
allowing for subsequent electroless deposition of a copper germination layer with improved adhesion
Data Source
AI summary
A solution and a process are used for activating the surface of a substrate comprising at least one area formed from a polymer, for the purpose of subsequently covering it with a metallic layer deposited via an electroless process. The composition contains: A) an activator formed from one or more palladium complexes; B) a binder formed from one or more organic compounds chosen from compounds comprising at least two glycidyl functions and at least two isocyanate functions; and C) a solvent system formed from one or more solvents capable of dissolving said activator and said binder. The solution and process may be applied for the manufacture of electronic devices such as integrated circuits, especially in three dimensions.