Flow Focusing Substrates for Bubble Removal in Electroplating
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Solution Overview
Problem
Air bubbles form in electroplating cells during the electroplating process, leading to non-uniform electrodeposition and requiring manual removal, which is time-consuming and exposes operators to chemicals.
Innovation Solution
An electroplating apparatus with a substrate holder and specially designed substrates featuring protuberances that direct the electrolyte flow to expel air bubbles from under and within the ionically resistive element, automating the bubble removal process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual bubble removal is used, then air bubbles can be removed from the electroplating cell, but the process is time-consuming and exposes operators to chemicals
Solution Approach 1:
The system uses the electrolyte flow itself to remove bubbles automatically. The flow diverter on the substrate directs electrolyte to accumulate under the ionically resistive element, creating upward flow that expels bubbles through the through-holes without manual intervention. The process serves itself by using its own operating fluid (electrolyte) to solve the bubble problem.
Solution Approach 2:
The flow diverter structure is pre-configured on the substrate before electroplating begins. This preliminary configuration ensures that as soon as electrolyte flows through the cell, it automatically directs flow to bubble-prone areas, preventing bubble accumulation before it becomes a problem rather than reacting to it afterward.
2Reliability
If manual bubble removal is used, then air bubbles can be removed from the electroplating cell, but operators are exposed to chemicals
Solution Approach 1:
The automated flow-directed bubble removal eliminates the need for operators to manually access the electroplating cell during operation. The system uses its own electrolyte flow to expel bubbles automatically, completely removing operators from hazardous environments and eliminating chemical exposure risks.
3Reliability
If electrolyte flow is increased to remove bubbles, then bubble removal effectiveness improves, but electrolyte consumption increases
Solution Approach 1:
The flow diverter creates localized high-velocity flow specifically in the regions where bubbles accumulate (under the ionically resistive element and within through-holes), while maintaining normal flow rates in other areas of the cell. This targeted approach concentrates bubble removal effort where needed without increasing overall electrolyte consumption.
Solution Approach 2:
The ionically resistive element divides the electroplating cell into multiple regions with through-holes that create discrete flow paths. This segmentation allows electrolyte to be directed to specific bubble-prone zones independently, enabling precise control of flow distribution to maximize bubble removal efficiency while minimizing total electrolyte usage.
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 automated process effectively removes air bubbles, ensuring uniform electrodeposition, reducing downtime, and minimizing operator exposure to chemicals by using flow focusing substrates to divert electrolyte flow and expel trapped bubbles.
Implementation Method 1
portions of the electrolyte descending from the manifold into the plurality of regions and ascending from the plurality of regions into the manifold via the through holes, forming air bubbles under the ionically resistive element and in a plurality of the through holes
Implementation Method 2
Electrochemical deposition (ECD), also called plating or electroplating, is used to deposit metals onto substrates
Data Source
AI summary
An electroplating apparatus includes an electrode at the bottom of a chamber, an ionically resistive element with through holes arranged horizontally at the top of the chamber, with a membrane in the middle. One or more panels extend vertically and parallelly from the membrane to the element and extend linearly across the chamber, forming a plurality of regions between the membrane and the element. A substrate with a protuberance extending along a chord of the substrate and contacting a top surface of the element is arranged above a first region. An electrolyte flowed between the substrate and the element descends into the first region via the through holes on a first side of the protuberance and ascends from the first region via the through holes on a second side of the protuberance, forcing air bubbles out from a portion of the element associated with the first region.