Primer Layer for Microelectronic Substrate Adhesion
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Solution Overview
Problem
Adhesion between dielectric and conductive layers in microelectronic substrates is challenging, particularly at fine pitches, leading to delamination issues and reduced electrical performance due to surface roughening treatments used in existing methods like desmear and acid-peroxide-based processes.
Innovation Solution
A primer is applied to the surfaces of dielectric and conductive materials to enhance adhesion without surface roughening, creating a profile-free interface, suitable for both semi-additive and laser ablation technologies, using materials like polyether sulfone or amide-type epoxy, which promotes reliable bonding and maintains electrical integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If surface roughening treatments (desmear, acid-peroxide) are applied to promote adhesion, then adhesion between layers is improved, but manufacturing complexity and potential delamination issues increase
Solution Approach 1:
The patent introduces a primer layer as an intermediary substance between the dielectric and conductive layers. This primer serves as a mediator that promotes adhesion without requiring surface roughening treatments, thereby simplifying the manufacturing process while maintaining strong interlayer bonding.
Solution Approach 2:
The patent changes the chemical parameters of the interface by applying a primer coating with specific chemical composition (polyether sulfone or amide-type epoxy). This chemical parameter change enables adhesion promotion through molecular-level interaction rather than mechanical interlocking via roughening.
2Strength
If surface roughening treatments are applied to promote mechanical interlocking, then adhesion is improved, but electrical performance deteriorates due to interface irregularities
Solution Approach 1:
The primer acts as an intermediary layer that provides a chemically active interface for adhesion while maintaining a smooth physical surface. This smooth interface prevents signal integrity issues and electrical performance deterioration that would result from roughening-induced irregularities.
Solution Approach 2:
The patent transitions from mechanical interlocking (physical parameter) to chemical bonding (chemical parameter) through the primer layer. This parameter change enables adhesion without creating surface irregularities that would harm electrical performance.
3Ease of manufacture
If traditional adhesion methods are used, then manufacturing process is established, but adhesion reliability at fine pitches is insufficient
Solution Approach 1:
The primer layer serves as a specialized intermediary that provides reliable adhesion at fine pitches where traditional methods fail. It bridges the dielectric and conductive layers with enhanced bonding capability specifically suited for high-density interconnect structures.
Solution Approach 2:
The patent employs composite material structure by introducing the primer as a distinct material layer with properties optimized for adhesion at fine pitches. This composite approach combines the dielectric, primer, and conductive materials to achieve reliable bonding in high-density configurations.
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 improves adhesion between metal and dielectric interfaces, maintaining substrate integrity and enhancing electrical performance by eliminating the need for surface roughening, thus supporting high-speed input/output operations and expanding the range of suitable dielectric materials.
Implementation Method 1
A primer is applied to the surfaces of dielectric and conductive materials to enhance adhesion without surface roughening
Data Source
AI summary
A method of manufacturing a substrate for a microelectronic device comprises providing a dielectric material (120, 220, 920) as a build-up layer of the substrate, applying a primer (140, 240, 940) to a surface (121, 221, 921) of the dielectric material, and forming an electrically conductive layer (150, 250, 950) over the primer. In another embodiment, the method comprises providing the dielectric material, forming the feature extending into the dielectric material, forming the electrically conductive layer over the dielectric material, applying the primer to a surface of the electrically conductive layer and attaching a dielectric layer (960) to the primer.