Electroplating Contact Pin Resistance Sensing for Uniform Plating
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Solution Overview
Problem
Poor contact formation between a substrate and contact pins in an electroplating system leads to unevenly distributed plated layers, causing performance degradation and potential substrate damage.
Innovation Solution
Incorporation of an array of contact detection sensors on the electroplating system's cone to detect resistance values at the substrate-contact pin interface, allowing a controller to determine proper contact formation by comparing resistance readings within predetermined ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact detection sensors are added to detect contact formation, then contact quality is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical contact verification systems with electrical resistance measurement. Instead of using mechanical sensors or visual inspection to detect contact formation, the system uses simple resistance measurements to determine whether the substrate is properly contacted with the contact pins. This substitution of mechanical detection with electrical measurement resolves the contradiction by improving contact quality detection while minimizing the increase in device complexity.
Solution Approach 2:
The substrate itself serves as the measurement element by providing its inherent electrical resistance properties for detection. The system utilizes the substrate's own electrical characteristics to indicate contact quality, eliminating the need for separate complex sensing mechanisms. This self-service approach allows contact quality improvement without proportionally increasing system complexity.
2Measurement precision
If resistance measurement is used to detect contact quality, then measurement precision is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent employs simple, inexpensive resistance measurement circuits that can be easily implemented and replaced if needed. The measurement system uses basic electrical components rather than complex, expensive instrumentation, making the detection process both precise and straightforward. This approach improves measurement precision while keeping the measurement complexity low through the use of simple, well-understood electrical measurement techniques.
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
Ensures uniform electroplating by identifying and preventing poor contacts, thereby maintaining substrate integrity and enhancing plating performance.
Implementation Method 1
detect resistance values at the substrate-contact pin interface
Implementation Method 2
electroplating system
Data Source
AI summary
The present disclosure relates to an electroplating system including a first contact detection sensor and a second contact detection sensor disposed at a surface of a cone of the electroplating system. The first contact detection sensor detects a first resistance at a first contact between a substrate to be plated by the electroplating system and a first contact pin, the second contact detection sensor detects a second resistance at a second contact between the substrate and a second contact pin. A controller receives the first resistance and the second resistance, and determines the first contact and the second contact are not properly formed when a difference between the first resistance and the second resistance is not within a first predetermined resistance range, or the first resistance or the second resistance is not within a second predetermined resistance range.