Semiconductor Inspection Station With In-Transfer Defect Sensing
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Solution Overview
Problem
Conventional semiconductor workpiece inspection methods do not allow for real-time defect detection during processing, leading to potential damage and wastage of workpieces as they are typically inspected only after processing is completed.
Innovation Solution
Integration of defect sensors within the process workstation, including optical, weight, and temperature sensors, which can collect data as the workpiece is transported or stationary, enabling real-time defect detection and remediation, such as pausing or diverting defective workpieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inspection is performed only after processing is completed, then the inspection system is simple and easy to implement, but workpieces may be damaged or wasted during processing without real-time detection
Solution Approach 1:
The patent applies preliminary action by performing inspection at multiple stages before final processing completion. Defect sensors are positioned to detect workpieces during transport and at intermediate processing stages, allowing early identification of defects before they propagate or cause damage during subsequent processing steps.
Solution Approach 2:
The patent uses defect sensors as intermediary detection devices positioned between processing chambers and transport mechanisms. These sensors act as mediators that continuously monitor workpiece condition during transfer and processing, enabling real-time defect detection without requiring complex post-processing inspection systems.
2Productivity
If real-time inspection during processing is implemented, then workpiece wastage is reduced and yield is enhanced, but the device complexity and cost increase
Solution Approach 1:
The patent merges inspection functionality with the existing processing workstation infrastructure. Defect sensors are integrated into the transfer chamber and processing chamber environments, combining inspection operations with transport and processing operations in a unified system, thereby reducing overall complexity compared to separate inspection systems.
Solution Approach 2:
The patent implements multi-functionality by using the processing chamber and transfer chamber environments for both processing and inspection purposes. The same physical spaces and robotic mechanisms serve dual roles, eliminating the need for dedicated inspection equipment and reducing system complexity while maintaining real-time defect detection capabilities.
3Measurement precision
If multiple defect sensors are integrated within the workstation, then real-time defect detection capability is improved, but the manufacturing complexity and initial cost increase
Solution Approach 1:
The patent applies dynamics by positioning defect sensors to detect workpieces during motion in the transfer chamber, rather than requiring static inspection positions. The sensors are configured to detect defects while the robotic arm transports workpieces, utilizing the dynamic environment to achieve comprehensive inspection without additional complex positioning mechanisms.
4Reliability
If inspection is delayed until after processing, then the processing flow is simple and fast, but defects are not detected until workpieces may already be damaged
Solution Approach 1:
The patent implements continuous inspection throughout the processing cycle rather than discrete post-processing inspection. Defect sensors continuously monitor workpieces during transport and processing, maintaining uninterrupted detection capability that identifies defects at the moment they occur or become apparent, eliminating delays between processing and inspection.
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 reduces workpiece wastage by allowing for immediate identification and remediation of defects, enhancing the yield and efficiency of semiconductor processing by detecting and addressing issues in real-time.
Implementation Method 1
optical, weight, and temperature sensors, which can collect data as the workpiece is transported or stationary
Implementation Method 2
optical, weight, and temperature sensors, which can collect data as the workpiece is transported or stationary
Implementation Method 3
optical, weight, and temperature sensors, which can collect data as the workpiece is transported or stationary
Data Source
AI summary
In an embodiment, a workstation includes: a processing chamber configured to process a workpiece; a load port configured to interface with an environment external to the workstation; a robotic arm configured to transfer the workpiece between the load port and the processing chamber; and a defect sensor configured to detect a defect along a surface of the workpiece when transferred between the load port and the processing chamber.