Divided Electrode Current Control for Plating Uniformity
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Solution Overview
Problem
Conventional electroplating processes for microelectronic devices struggle to maintain uniform distribution of line currents, leading to inconsistent plating results due to variations in contact conditions between the microelectronic workpiece and the power supply electrode.
Innovation Solution
An electroplating system employing a divided electrode with a current control component that senses and regulates individual line currents, allowing for adjustment based on sensed magnitudes to ensure uniform plating, using a controller circuit with sensors and feedback mechanisms to manage power supply voltage and current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional electroplating processes use a single electrode for all line currents, then the device complexity is reduced, but the manufacturing precision deteriorates due to non-uniform current distribution
Solution Approach 1:
The single electrode is divided into multiple separate electrodes, each corresponding to a specific line current path. This segmentation allows independent control of current distribution across different regions, enabling uniform plating thickness despite variations in seed layer thickness or contact conditions.
Solution Approach 2:
Each divided electrode is designed with specific local characteristics (such as varying surface areas, positions, or geometries) to compensate for local variations in the workpiece. This local quality adjustment ensures that each region receives the appropriate current density for uniform plating.
2Manufacturing precision
If individual line currents are regulated with separate control components, then the plating uniformity improves, but the device complexity increases
Solution Approach 1:
Current sensors are integrated into each control component to monitor the actual current flowing through each electrode. The control components use this feedback information to adjust and regulate the line currents, ensuring uniform distribution despite variations in contact conditions or seed layer thickness.
Solution Approach 2:
The control components are designed to automatically regulate current distribution based on real-time sensor feedback without requiring external intervention. This self-service capability simplifies operation while maintaining precise control over current uniformity.
3Reliability
If the power supply voltage is increased to compensate for high contact resistance, then the current flow improves, but the plating uniformity deteriorates due to excessive current in low-resistance paths
Solution Approach 1:
By segmenting the electrode system into multiple independent electrodes, the total current is divided into separate line currents. This allows the power supply to operate at a lower, safer voltage while still delivering sufficient current to each individual path, preventing the need to overcompensate for contact resistance.
Solution Approach 2:
The system changes the electrical parameters by using multiple lower-voltage, controlled current paths instead of a single high-voltage path. This parameter change enables precise control of current distribution without the harmful effects of excessive voltage and current.
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 approach enables precise control of line currents, ensuring uniform electroplating distribution and compensating for thickness variations in seed layers, thereby improving plating uniformity and density.
Implementation Method 1
electroplating processes involve immersing at least the surface of the workpiece in a conductive solution of a desired material and passing an electrical current through the solution and conductive portions of the workpiece. As the current passes through the solution, cations of the desired material are reduced and conductive portions of the surface are coated with the material.
Implementation Method 2
passing an electrical current through the solution and conductive portions of the workpiece
Data Source
AI summary
An electroplating system is provided. The electroplating system includes a divided electrode that is arranged to simultaneously provide a plurality of line currents for an electroplating process. The system includes a current control component that is coupled to the divided electrode. The current control component is configured to determine the magnitude of each of the line currents. The current control component is also configured to regulate individual line currents based, at least in part, on the determined magnitude of each of the line currents.