Fluid Handling Module for Wafer Electroless Plating
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Solution Overview
Problem
The electroless plating process for semiconductor wafers requires precise control and efficient handling of electroless plating solutions to ensure uniform deposition and minimize void formation, but existing technologies lack a comprehensive and controlled approach for forming electroless copper and cobalt layers.
Innovation Solution
A fluid handling module for semiconductor wafer electroless plating chambers is introduced, featuring a supply line, mixing manifold, and chemical fluid handling system to recirculate and precondition chemical components, forming the electroless plating solution in a controlled manner and dispensing it directly to the wafer, minimizing flow distance and optimizing the plating process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electroless plating solution is dispensed directly to wafer, then deposition uniformity is improved, but solution mixing complexity increases
Solution Approach 1:
The electroless plating solution is divided into multiple chemical components that are separately stored and then mixed immediately before dispensing. The mixing manifold segments the delivery of different chemicals, allowing precise control over the mixing process and ensuring uniform deposition on the wafer while managing system complexity through modular architecture.
Solution Approach 2:
Chemical components are pre-conditioned and stored in separate tanks before being mixed. The system performs preliminary preparation of individual chemicals, then combines them at the point of use (mixing manifold) to create the electroless plating solution immediately before dispensing onto the wafer, ensuring optimal mixing and deposition uniformity.
2Reliability
If multiple chemical components are mixed in mixing manifold, then plating solution control is improved, but device complexity increases
Solution Approach 1:
The mixing manifold acts as an intermediary device that receives multiple chemical components from separate supply lines and combines them into the final electroless plating solution. This intermediary structure enables precise control over the plating solution composition and delivery while consolidating multiple functions into a single integrated component, thereby managing overall system complexity.
Solution Approach 2:
The mixing manifold performs multiple functions: it mixes chemical components, controls their delivery ratios, regulates flow rates, and prepares the solution for dispensing. By consolidating these multiple functions into a single multi-functional device, the system achieves improved plating solution control without proportionally increasing device complexity.
3Productivity
If flow distance is minimized, then deposition efficiency is improved, but system layout complexity increases
Solution Approach 1:
The mixing manifold and dispensing system are merged into a single integrated assembly that is positioned in close proximity to the wafer. This merging of functions (mixing and dispensing) allows the electroless plating solution to be delivered directly to the wafer surface with minimal flow distance, improving deposition efficiency while managing layout complexity through functional integration.
Solution Approach 2:
The system transitions from a linear, sequential layout to a compact, three-dimensional arrangement where chemical tanks, mixing manifold, and wafer processing area are positioned in close spatial proximity. This dimensional reorganization minimizes the flow path length for the plating solution while accommodating all necessary system components, thereby improving efficiency without excessive layout complexity.
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 enables precise and efficient electroless plating with improved adhesion and reduced void formation, enhancing the reliability and performance of interconnects in semiconductor devices by ensuring consistent and controlled deposition of copper and cobalt layers.
Implementation Method 1
The mixing manifold is defined to mix the number of chemicals to form the electroless plating solution
Implementation Method 2
electroless Cu can be used to form a thin conformal seed layer on a conformal barrier to optimize a gapfill process
Implementation Method 3
During the electroless plating process, electrons are transferred from a reducing agent to the Cu (or Co) ions in the solution resulting in the deposition of reduced Cu (or Co) onto the wafer surface
Implementation Method 4
Each fluid recirculation loop is defined to pre-condition a chemical component of an electroless plating solution
Data Source
AI summary
A chemical fluid handling system is defined to supply a number of chemicals to a number of fluid inputs of a mixing manifold. The chemical fluid handling system includes a number of fluid recirculation loops for separately pre-conditioning and controlling the supply of each of the number of chemicals. Each of the fluid recirculation loops is defined to degas, heat, and filter a particular one of the number of chemical components. The mixing manifold is defined to mix the number of chemicals to form the electroless plating solution. The mixing manifold includes a fluid output connected to a supply line. The supply line is connected to supply the electroless plating solution to a fluid bowl within an electroless plating chamber.