Wafer Clamping Pressure Feedback for Electroplating Alignment
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Solution Overview
Problem
The existing electroplating processes for integrated circuit manufacturing face issues with wafer breakage due to excessive pressure from the cone during the clamping process and misalignment of the wafer and cone, leading to inefficiencies and waste in the copper damascene process.
Innovation Solution
The electroplating apparatus incorporates a clamshell design with pressure sensors and a feedback module to monitor and control the pressure force applied by the cone, ensuring it does not exceed a predetermined value and maintaining proper alignment, thereby preventing wafer breakage and optimizing the electroplating process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cone applies high pressure to clamp the wafer during electroplating, then the wafer is securely held in position, but the wafer may break due to excessive pressure
Solution Approach 1:
The patent implements a feedback mechanism using pressure sensors to monitor the clamping force applied by the cone to the wafer. The system includes a controller that receives pressure sensor signals and adjusts the cone's clamping force accordingly, preventing excessive pressure that could cause wafer breakage while maintaining sufficient clamping stability during electroplating operations
Solution Approach 2:
The patent changes the pressure parameter from a fixed high value to a dynamically controlled value within an optimal range. By using pressure sensors to detect actual clamping force and the controller to adjust the cone's position, the system maintains pressure within safe limits that prevent wafer breakage while ensuring reliable clamping
2Reliability
If the cone applies strong clamping force to prevent wafer movement, then positioning stability is improved, but misalignment between wafer and cone may occur
Solution Approach 1:
The patent transitions from a static clamping system to a dynamic one where the cone's position and applied force are continuously adjusted based on real-time pressure sensor feedback. This dynamic control allows the system to maintain proper alignment while applying sufficient clamping force, preventing both wafer movement and misalignment issues
Solution Approach 2:
The feedback mechanism monitors clamping force and adjusts the cone's position to maintain optimal alignment. The controller receives pressure sensor signals and modifies the cone's movement to prevent misalignment, ensuring both stability and precision during the electroplating process
3Reliability
If pressure sensors and feedback control are added to monitor clamping force, then wafer breakage is prevented, but device complexity increases
Solution Approach 1:
The patent replaces manual or purely mechanical clamping control with an automated electromechanical system. The controller electronically manages the cone's movement based on pressure sensor feedback, substituting complex mechanical adjustment mechanisms with a simpler electronic control system that achieves the same reliability improvement
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
The solution effectively prevents wafer breakage by real-time pressure monitoring and control, improving the yield and efficiency of the electroplating process by ensuring the cone applies the correct amount of pressure and maintaining proper alignment, thus reducing waste and enhancing the manufacturing process.
Implementation Method 1
A pressure force applied by the cone against the wafer is detected
Implementation Method 2
electroplating is used to deposit a copper layer over the seed layer such that the channels are filled
Implementation Method 3
a seed layer of copper is first deposited into the channels and on the substrate surface via physical vapor deposition
Data Source
AI summary
A method includes disposing a wafer in a cup of a clamshell of an electroplating apparatus. The wafer is clamped using the cup and a cone of the clamshell. Pressure forces applied by the cone against the wafer are detected by pressure sensors. The pressure forces include a maximum pressure and a minimum pressure. Clamping the wafer is stopped when a difference between the maximum pressure and the minimum pressure is higher than a predetermined value.