Electroless Plating Solution Activation for Faster Substrate Processing
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Solution Overview
Problem
Existing electroless plating processes are time-consuming due to prolonged incubation times and inefficient plating reaction rates, which can lead to non-uniform film thickness and potential metal precipitation issues.
Innovation Solution
A substrate liquid processing apparatus with a reaction acceleration unit that activates and heats the electroless plating solution, comprising an activation unit and a reaction heater, to enhance plating reaction efficiency and control film growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional electroless plating solution is used without activation, then the plating process is simple and solution stability is maintained, but the plating time is prolonged and reaction rate is slow
Solution Approach 1:
The patent applies preliminary action by introducing an activation unit that pre-treats the electroless plating solution before it reaches the substrate. This activation unit accelerates the plating reaction in advance, so when the solution contacts the substrate, the plating reaction proceeds rapidly without requiring complex in-situ activation methods, thus improving plating speed while maintaining reasonable system complexity
Solution Approach 2:
The patent uses an intermediary approach by inserting an activation unit between the plating solution supply and the substrate. This activation unit acts as a mediator that modifies the solution properties (accelerating the reaction) without directly contacting the substrate, thereby improving plating efficiency while keeping the overall system structure relatively simple
2Productivity
If plating reaction rate is increased to shorten plating time, then productivity improves, but film thickness uniformity deteriorates and metal precipitation occurs
Solution Approach 1:
The patent applies local quality by ensuring that the activation unit selectively accelerates the plating reaction in the solution flow path without causing uncontrolled rapid deposition on the substrate. The activation unit creates locally enhanced reaction conditions in the bulk solution, while the substrate surface maintains controlled deposition characteristics, thereby achieving both high productivity and good film thickness uniformity
Solution Approach 2:
The patent uses parameter changes by modifying the chemical reaction rate parameters of the plating solution through the activation unit. This controlled parameter modification accelerates the overall reaction without creating localized hotspots or uncontrolled deposition on the substrate, thus improving plating speed while maintaining film thickness uniformity and preventing metal precipitation
3Reliability
If incubation time is prolonged, then plating reaction becomes more stable, but total processing time increases and productivity decreases
Solution Approach 1:
The patent applies preliminary action by performing the incubation acceleration in advance through the activation unit. This pre-activation creates a more stable and faster reaction state before the solution reaches the substrate, thereby reducing the actual incubation time needed while maintaining reaction stability, thus decreasing total processing time and improving productivity
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
The apparatus significantly reduces electroless plating time by shortening incubation times and controlling film thickness uniformity, preventing metal precipitation, and improving plating quality.
Implementation Method 1
a reaction heater configured to heat the electroless plating solution
Implementation Method 2
an activation unit configured to accelerate the electroless plating solution with respect to the plating reaction
Data Source
AI summary
A technique advantageous for shortening time required for electroless plating that is performed on a substrate is provided. A substrate liquid processing apparatus includes a substrate holder configured to hold the substrate; a reaction acceleration unit, configured to accelerate a plating reaction of an unused electroless plating solution, including an activation unit configured to accelerate the electroless plating solution with respect to the plating reaction and a reaction heater configured to heat the electroless plating solution; and a plating solution supply configured to supply the electroless plating solution to the substrate held by the substrate holder.