Wafer Sensor Alignment Using Phase-Change Pattern Recording
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Solution Overview
Problem
Existing semiconductor manufacturing processes face challenges in achieving precise wafer alignment due to mechanical errors, which can lead to yield deterioration and require costly modifications to equipment and transfer systems.
Innovation Solution
A wafer alignment system utilizing a wafer sensor with a phase change material layer, supported by a heatable support member and transferred by a transfer device, which records and analyzes pattern and edge information to ensure precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wafer-type sensor system is mounted within the entire transfer system to collect alignment information, then alignment evaluation capability is improved, but system complexity increases
Solution Approach 1:
The alignment evaluation function is extracted from the complex transfer system and concentrated into a dedicated wafer-type sensor. This sensor contains a phase change material layer that records alignment information during transfer, separating the measurement function from the transfer mechanism and reducing overall system complexity while maintaining measurement precision
Solution Approach 2:
A wafer-type sensor acts as an intermediary between the wafer and the transfer system. The sensor includes a phase change material layer that indirectly records alignment information by undergoing phase changes in response to thermal fields during transfer, enabling alignment evaluation without direct complex sensing in the transfer system
2Manufacturing precision
If alignment evaluation equipment is added to the transfer system, then alignment control capability is improved, but equipment cost increases
Solution Approach 1:
The wafer-type sensor is designed as a disposable or reusable component that can be easily replaced. The sensor substrate with phase change material layer serves as a low-cost alignment recording medium compared to modifying expensive semiconductor equipment, enabling alignment control capability without significant equipment investment
Solution Approach 2:
The phase change material layer undergoes parameter changes (phase transitions) in response to thermal fields during wafer transfer. These physical parameter changes record alignment information, providing a simple yet effective method for alignment evaluation that avoids costly equipment modifications
3Reliability
If mechanical errors accumulate over time, then alignment precision deteriorates, but equipment operation continues
Solution Approach 1:
The wafer-type sensor provides feedback on actual alignment conditions during transfer by recording thermal field patterns in the phase change material layer. This feedback mechanism allows real-time monitoring of alignment precision deterioration due to mechanical errors, enabling timely corrective actions without stopping equipment operation
Solution Approach 2:
The phase change material layer in the wafer sensor preliminarily records alignment information during the transfer process itself. By capturing alignment data in advance through phase changes, the system can evaluate and correct alignment issues before they significantly impact yield, maintaining reliability over extended operational periods
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 system effectively maintains precise wafer alignment, reducing yield deterioration and eliminating the need for costly equipment modifications by using a phase change material layer to store and analyze alignment information.
Implementation Method 1
a phase change material layer provided on the wafer substrate
Implementation Method 2
a support member configured to support the wafer sensor and heat the wafer sensor
Data Source
AI summary
A wafer alignment system includes a wafer sensor including a wafer substrate and a phase change material layer provided on the wafer substrate, a support member to support and heat the wafer sensor, a transfer device to transfer the wafer sensor to the support member, and a measurement device to analyze crystal information of the phase change material layer of the wafer sensor and control the transfer device.