Graphene Via Electrode Manufacturing via Catalyst Dip-Coating
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Solution Overview
Problem
The existing methods for manufacturing via electrodes in stacked chip packages, such as those using through silicon vias (TSVs), face challenges with high production costs, inefficiencies in reducing resistance between wires, and defects like voids and seams, which hinder productivity and yield.
Innovation Solution
A method involving the formation of a via electrode using a graphene layer within the via hole, where a catalyst layer is applied and exposed to a graphene particle solution, followed by a heat treatment to harden the graphene layer, reducing defects and enhancing conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metallic materials are used in via electrodes with conventional methods (electroplating, laser reflowing, dipping, paste printing), then via electrodes can be formed, but production cost increases and defects such as voids and seams occur
Solution Approach 1:
The invention changes the material parameter from conventional metals to graphene particles, which have superior electrical conductivity. This parameter change resolves the contradiction by providing both lower production costs (graphene can be applied through simpler dip-coating without high-pressure or high-temperature processes) and higher reliability (graphene's superior conductivity and defect-free structure)
Solution Approach 2:
The invention uses a disposable catalyst layer that is removed after graphene formation. This eliminates the need for complex electroplating equipment and high-cost metallic materials, significantly reducing production cost while maintaining via electrode functionality through the graphene layer
2Productivity
If metallic materials are used in via electrodes with conventional methods, then via electrodes can be formed, but void defects and seam defects occur reducing production yield
Solution Approach 1:
The invention replaces mechanical/thermal processes (electroplating, laser reflowing, high-pressure dipping) with a chemical solution-based approach where graphene particles are deposited from a liquid medium. This substitution eliminates the high-energy processes that cause voids and seams, achieving defect-free via electrodes with higher production yield
Solution Approach 2:
The invention uses composite structure consisting of catalyst layer and graphene layer. The catalyst layer facilitates graphene deposition, and the resulting graphene-composite via electrode provides superior electrical conductivity without the defects associated with conventional metallic materials
3Ease of manufacture
If high pressure (over 5 Mpa) is applied for laser reflowing or dipping, then via electrodes can be formed, but production cost increases
Solution Approach 1:
The invention uses a disposable catalyst layer that enables graphene deposition at atmospheric pressure through simple dip-coating. This eliminates the need for expensive high-pressure equipment and energy-intensive processes, significantly improving profitability while maintaining ease of manufacture
Solution Approach 2:
The invention extracts the high-pressure requirement from the via electrode formation process by using solution-based graphene particle deposition. This extraction of the harmful high-pressure condition reduces both equipment cost and operational expense, improving productivity and profitability
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 results in a more conductive via electrode with reduced production costs and defects, improving productivity and yield by preventing void and seam defects, and enhancing electrical characteristics.
Implementation Method 1
forming a catalyst layer at a sidewall and a bottom of the via hole; and forming a graphene layer in the via hole by exposing the catalyst layer to a solution mixed with graphene particles
Implementation Method 2
the formation of the graphene layer may include applying a magnetic field to a lower portion of the substrate
Implementation Method 3
hardening the graphene layer through a heat treatment process
Data Source
AI summary
Provided is a method of manufacturing a via electrode by which productivity and production yield can be augmented or maximized. The method of the present invention includes: forming a via hole at a substrate; forming a catalyst layer at a sidewall and a bottom of the via hole; and forming a graphene layer in the via hole by exposing the catalyst layer to a solution mixed with graphene particles.