Wafer Clamping Switches to Mechanical Hold at High Temperature
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Solution Overview
Problem
Existing wafer clamping methods in semiconductor manufacturing face challenges with thermal stress and residual adsorption force, particularly during high-temperature ion implantation processes, leading to potential wafer breakage or bouncing.
Innovation Solution
A wafer clamping method using a combination of a mechanical clamp and an electrostatic chuck, where the controller selectively uses only the mechanical clamp at high processing temperatures to minimize thermal stress and avoid complex voltage control for residual adsorption force removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the electrostatic chuck is used to clamp the wafer during high-temperature processing, then the wafer can be held firmly, but thermal stress accumulates and residual adsorption force remains causing wafer breakage or bouncing
Solution Approach 1:
The system dynamically switches between electrostatic chuck and mechanical clamp based on processing temperature. At high temperatures, the mechanical clamp is activated while the electrostatic chuck is deactivated, allowing the wafer to expand thermally without constraint. This dynamic adaptation resolves the contradiction by providing firm clamping when needed while avoiding thermal stress accumulation during high-temperature processing.
Solution Approach 2:
The control parameter (temperature) triggers a change in clamping mechanism. When temperature exceeds a predetermined threshold, the system transitions from electrostatic clamping to mechanical clamping. This parameter-based switching allows the system to adapt to thermal conditions, preventing thermal stress while maintaining effective wafer holding during high-temperature ion implantation processes.
2Manufacturing precision
If the electrostatic chuck is used for clamping, then precise wafer positioning is achieved, but complex voltage control is required to remove residual adsorption force
Solution Approach 1:
The invention extracts the voltage control complexity from the high-temperature processing scenario by introducing a temperature-based switching mechanism. The mechanical clamp handles high-temperature clamping without requiring any voltage control, while the electrostatic chuck is used only when precise positioning is needed at lower temperatures. This separation eliminates the need for complex voltage control during high-temperature processes while preserving positioning precision when required.
3Object-affected harmful factors
If the mechanical clamp is used alone at high temperature, then thermal stress is reduced, but the wafer may not be clamped as firmly as with electrostatic chuck
Solution Approach 1:
The system employs dynamic selection of clamping mechanisms based on temperature conditions. At high temperatures, the mechanical clamp provides sufficient holding force while allowing thermal expansion, reducing thermal stress. At lower temperatures, the electrostatic chuck provides stronger clamping force when needed. This dynamic approach ensures both thermal stress reduction and adequate clamping force are achieved through context-appropriate mechanism selection.
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 method effectively reduces thermal stress and eliminates the need for complex voltage control, thereby preventing wafer breakage and ensuring stable clamping during high-temperature implantation processes.
Implementation Method 1
a wafer clamp including a mechanical clamp and an electrostatic chuck
Data Source
AI summary
A semiconductor manufacturing apparatus includes a wafer clamp including a mechanical clamp and an electrostatic chuck, and a controller that controls the wafer clamp to selective clamp a wafer using only the mechanical clamp based on a processing temperature of a wafer.