Plating System Barrier for Uniform Wafer Thickness
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Solution Overview
Problem
Current plating systems for semiconductor wafers face challenges in achieving uniform plating thickness and distribution, leading to inaccuracies in semiconductor device fabrication, especially when dealing with smaller feature sizes.
Innovation Solution
The introduction of a plating system with a barrier in the electroplating chamber that recirculates plating solution back onto the wafer, combined with a high resistance virtual anode and membrane configurations, ensures uniform flow and distribution of plating material, enhancing the uniformity of plating thickness across the wafer surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If plating solution is introduced into the electroplating chamber, then plating material is deposited onto the wafer, but non-uniform flow distribution causes inconsistent plating thickness across the wafer surface
Solution Approach 1:
The electroplating chamber is segmented into multiple flow zones using barriers positioned at specific locations. The plating solution flow is divided into separate streams that are directed toward different regions of the wafer, allowing independent control of flow distribution patterns to achieve uniform plating thickness across the entire wafer surface
Solution Approach 2:
Barriers are introduced as intermediary elements between the plating solution inlet and the wafer surface. These barriers mediate the flow distribution by redirecting and evenly dispersing the plating solution across different wafer regions, eliminating direct non-uniform flow patterns and achieving consistent plating thickness
2Manufacturing precision
If plating solution flows through the electroplating chamber, then plating material is delivered to the wafer, but solution removal inefficiency leads to accumulation and non-uniform distribution
Solution Approach 1:
The plating solution circulation system employs dynamic flow control mechanisms that adjust flow rates and patterns during the plating process. The barriers and flow distribution structures are designed to adaptively redirect solution flow based on real-time distribution needs, maintaining both high circulation efficiency and uniform plating thickness through dynamic flow management
3Manufacturing precision
If conventional plating systems are used, then plating process is simple, but plating thickness varies across the wafer surface leading to fabrication inaccuracies
Solution Approach 1:
The electroplating chamber incorporates localized flow control features including barriers positioned at specific locations and angled to direct flow toward particular wafer regions. This local quality approach ensures that each region of the wafer receives appropriately distributed plating solution, achieving uniform plating thickness without requiring complete system redesign
Solution Approach 2:
Barriers serve as intermediary flow distribution elements that are strategically positioned within the electroplating chamber. These intermediaries redirect and evenly distribute the plating solution across the wafer surface, achieving uniform plating thickness while adding only moderate structural complexity to the system
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 results in more accurate and uniform plating thickness, reducing differences in plating rates across the wafer surface, thereby improving the fabrication of semiconductor devices with smaller feature sizes and reducing defects like air bubbles and voids in interconnect structures.
Implementation Method 1
At least some of the plating solution flowing towards and/or through the outlet is reflected by the barrier back into the plating region and/or towards the wafer
Implementation Method 2
an electroplating chamber defining a plating region within which a wafer is plated
Data Source
AI summary
A plating system is provided. The plating system includes an electroplating chamber defining a plating region within which a wafer is plated. The electroplating chamber includes an inlet configured to introduce plating solution into the plating region of the electroplating chamber. The electroplating chamber includes an outlet configured to remove the plating solution from the plating region of the electroplating chamber. The plating system includes a barrier configured to inhibit removal of the plating solution from the plating region.