Microdroplet Electrochemical Deposition for Selective Circuit Plating
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Solution Overview
Problem
Conventional electrochemical deposition methods result in unwanted material deposition on masked areas and significant waste of electrolyte solution due to submersion and immersion processes, lacking selectivity and efficiency.
Innovation Solution
The method involves using microdroplets of electrolytic solution, typically less than 1000 nanoliters, directly applied to specific areas of a substrate, with electrical current passed through microprobes to achieve selective deposition without masking or submersion, minimizing solution consumption and waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional electrochemical deposition uses submersion in electrochemical bath, then deposition can be achieved on substrate, but unwanted deposition occurs on masked areas and significant electrolyte solution is wasted
Solution Approach 1:
The patent divides the electrochemical deposition process into localized microdroplet units rather than a continuous bath. Each microdroplet (less than 1000 nanoliters) is independently placed on specific circuit elements, creating discrete deposition zones that prevent unwanted material deposition on other areas and minimize electrolyte consumption.
Solution Approach 2:
The invention applies different conditions to different locations on the substrate by placing microdroplets only where deposition is desired. This localized application ensures that electrolyte and deposited material are confined to specific circuit elements, achieving high selectivity without requiring masking and eliminating waste on non-target areas.
2Manufacturing precision
If masking is used to cover areas not being deposited, then selective deposition is attempted, but material is lost as waste over masked areas and masking removal is required
Solution Approach 1:
The patent extracts and eliminates the masking step entirely from the deposition process. Instead of applying a mask layer and then performing deposition, the method directly applies microdroplets only to the desired areas, achieving selectivity through precise liquid placement rather than physical barriers.
Solution Approach 2:
Conventional methods apply deposition globally and use masking to prevent unwanted areas; this invention inverts the approach by applying deposition locally only where needed from the start, making masking unnecessary and simplifying the process workflow.
3Quantity of substance
If entire substrate surface is exposed to chemical bath, then deposition can occur, but consumption and waste of electrolytic solution increases significantly
Solution Approach 1:
The patent applies partial action by using microdroplets that cover only the specific portions of the substrate where deposition is needed, rather than submerging the entire substrate. This localized approach uses minimal electrolyte solution (less than 1000 nanoliters per droplet) while achieving complete coverage of target areas, dramatically reducing overall solution consumption and waste.
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 allows precise deposition on targeted areas with minimal waste and reduced power consumption, eliminating the need for extensive masking and rinsing, thereby reducing reagent usage and process steps while maintaining high selectivity for microelectronic devices.
Implementation Method 1
electrochemical deposition occurs over the entire surface of the substrate
Implementation Method 2
A current from a power supply is passed, typically from one electrode through the droplet of solution to one or more circuit elements that are connected to another electrode
Data Source
AI summary
A method of electrochemical deposition uses microdroplets of electrolytic solution over a targeted small circuit element. Only the targeted circuit element is electrically biased so that deposition occurs on the surface of that element, underneath the microdroplet, and nowhere else unless it is under other microdroplet(s). The invented method achieves extremely accurate and selective electrochemical deposition with a tiny amount of electrolytic solution, compared to conventional submersive and/or immersive methods, and eliminates the need for masking or etching, reducing the costs of manufacture and amount of waste electrolytic solution produced.