Membrane Tube Shield for Electroplating Edge Uniformity
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Solution Overview
Problem
Achieving uniform metal film thickness in electroplating processes is challenging due to variations in substrate geometry and active plating area, particularly at the perimeter of microelectronic devices, as existing electroplating apparatus require time-consuming adjustments to electric field shields to match changing wafer characteristics.
Innovation Solution
The use of membrane tube rings with adjustable conductivity fluids as electric field shields in the electroplating apparatus allows for dynamic control of the shielding effect, enabling uniform plating across substrates of varying sizes and geometries without the need for frequent shield adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional fixed electric field shields are used in electroplating apparatus, then the plating uniformity can be optimized for specific substrate geometries, but the apparatus requires time-consuming shield changes when processing different substrate sizes or patterns
Solution Approach 1:
The patent applies the dynamics principle by replacing fixed electric field shields with adjustable membrane tube shields that can dynamically change their shielding characteristics. The membrane tubes can be filled with different conductivity fluids or adjusted in position to adapt to different substrate geometries and plating requirements, eliminating the need for manual shield changes while maintaining plating uniformity across varying substrate conditions
Solution Approach 2:
The patent implements parameter changes by varying the electrical conductivity of the fluid within the membrane tube shields. By adjusting the conductivity parameter of the fill fluid (e.g., using deionized water for high shielding or electrolyte solution for reduced shielding), the system can optimize plating uniformity for different substrate types without physical shield changes, thereby reducing time loss while maintaining precision
2Manufacturing precision
If electric field shields are customized for each substrate type, then optimal plating results can be achieved, but the complexity and time required for shield management increases significantly
Solution Approach 1:
The patent applies universality by designing membrane tube shields that can serve multiple substrate types and plating conditions through a single configurable system. The same membrane tube structure can be adapted to different substrates by simply changing the fill fluid conductivity or adjustment parameters, eliminating the need for multiple specialized shields and reducing management complexity while maintaining optimal plating quality
Solution Approach 2:
The system reduces complexity by using parameter changes (fluid conductivity, tube position) rather than physical shield changes. This allows a single universal shield structure to handle multiple substrate types by adjusting parameters, significantly reducing the complexity of shield management while maintaining high plating quality across different applications
3Manufacturing precision
If the active plating area varies due to different wafer patterns and edge exclusion zones, then substrate-specific optimization is needed, but frequent shield adjustments increase process time
Solution Approach 1:
The patent applies dynamics by using adjustable membrane tube shields that can quickly adapt to different active plating areas through fluid conductivity changes or position adjustments. This dynamic capability allows the system to maintain edge plating uniformity across varying wafer patterns and edge exclusion zones without the productivity loss associated with manual shield changes, thereby increasing overall plating throughput
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 solution ensures consistent metal film thickness and adaptability to different substrate sizes and patterns, improving the efficiency and precision of the electroplating process by allowing real-time adjustments to the electric field without manual intervention.
Implementation Method 1
one or more membrane tube rings which act as electric field shields, to provide advantageous plating characteristics at the perimeter of a substrate
Implementation Method 2
The membrane tube rings may be filled with fluids having different conductivity, to change the shielding effect as desired
Implementation Method 3
Electrical current is passed through the electrolyte and the conductive layer. Metal ions in the electrolyte plate out onto the substrate, forming a metal film on the substrate
Data Source
AI summary
An electroplating apparatus has one or more membrane tube rings which act as electric field shields, to provide advantageous plating characteristics at the perimeter of a work piece. The membrane tube rings may be filled with fluids having different conductivity, to change the shielding effect as desired for electroplating different types of substrates. The membrane tube rings may optionally be provided in or on a diffuser plate in the vessel of the apparatus.