Site-Selective Metal Plating via Ligand Coordination
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Solution Overview
Problem
Current microelectronic device packaging processes are labor-intensive and resource-heavy due to the need for lithographically-defined photoresist masks and seed layers in metallization, leading to issues with uniformity and increased costs, especially as feature sizes decrease.
Innovation Solution
A site-selective electroless deposition method using a ligand coordinating layer formed by chemisorption of tether compounds on the substrate dielectric, where UV light exposure patterns the layer to create active regions for catalytic metal ion complexation, allowing for site-selective metallization without a photoresist mask or seed layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lithographically-defined photoresist masks and seed layers are used in metallization, then uniformity and precision are improved, but process complexity and manufacturing costs increase
Solution Approach 1:
The patent extracts and removes the photoresist mask and seed layer steps from the conventional metallization process. By using a ligand coordinating layer that directly binds metal ions through chemisorption, the invention eliminates the need for lithographically-defined photoresist masks and seed layers, thereby reducing process complexity while maintaining metallization precision
Solution Approach 2:
The patent introduces a ligand coordinating layer as an intermediary between the substrate and the metal ions. This layer uses chemisorption to selectively bind metal ions at specific sites, replacing the conventional photoresist mask and seed layer system. The ligand coordinating layer acts as a mediator that enables precise metal deposition without requiring complex lithography processes
2Manufacturing precision
If photoresist masks and seed layers are used, then metallization precision is improved, but manufacturing costs increase
Solution Approach 1:
The patent removes the expensive photoresist mask and seed layer materials from the process. By using a ligand coordinating layer formed through simple chemisorption, the invention eliminates the need for costly lithography materials and processes, thereby reducing manufacturing costs while maintaining metallization precision
Solution Approach 2:
The ligand coordinating layer serves as a disposable, low-cost alternative to expensive photoresist masks and seed layers. This layer can be formed through simple chemisorption processes and is consumed in the metallization process, providing a cost-effective solution that maintains precision without requiring expensive reusable masks or seed layers
3Reliability
If conventional metallization processes are used, then process robustness is maintained, but productivity decreases due to labor-intensive steps
Solution Approach 1:
The ligand coordinating layer performs multiple functions automatically through chemisorption: it defines the metal deposition pattern, binds metal ions selectively, and eliminates the need for separate photoresist and seed layer steps. This self-service capability reduces labor-intensive operations and improves productivity while maintaining process robustness
Solution Approach 2:
The patent merges the functions of photoresist masking, seed layer formation, and metal deposition into a single ligand coordinating layer system. By combining these separate process steps into one integrated approach using chemisorption, the invention reduces the number of discrete operations required, thereby improving productivity while maintaining the robustness of controlled metal deposition
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 method simplifies the metallization process, improves uniformity, and reduces costs by eliminating the need for photoresist deposition and lithography, enabling arbitrary thickness metallization with enhanced precision and efficiency.
Implementation Method 1
a ligand coordinating layer formed by chemisorption of tether compounds on the substrate dielectric
Implementation Method 2
where UV light exposure patterns the layer to create active regions for catalytic metal ion complexation
Implementation Method 3
A site-selective electroless deposition method using a ligand coordinating layer
Data Source
AI summary
An integrated circuit (IC) package comprising a substrate having a dielectric, a first structure over at least a portion of the dielectric, the first structure comprising a molecular compound having a ligand coordinating moiety and a second structure over at least a portion of the first structure, the second structure comprising a metal, wherein the first structure is chemically bonded to the dielectric.