Atomic-Level Wafer Inspection for Early Defect Screening
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Solution Overview
Problem
The high cost and time-consuming nature of inspections in integrated circuit manufacturing, particularly due to the need for extensive processing before determining device quality, lead to inefficiencies and increased costs as imperfect devices are only identified at the conclusion of the manufacturing process.
Innovation Solution
Applying scanning probe microscopy during the fabrication process to obtain conductance and topological data, allowing for real-time diagnostic determinations and selective application or omission of subsequent manufacturing processes, thereby improving throughput and reducing waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inspections are performed at the conclusion of the manufacturing process, then device quality can be assured, but the cost and time increase significantly due to processing imperfect devices through the entire manufacturing sequence
Solution Approach 1:
The patent applies preliminary inspection action by performing scanning probe microscopy examinations at intermediate stages during the fabrication process rather than waiting until the conclusion. This allows defects to be detected early, enabling selective continuation or termination of processing steps for individual devices, thereby reducing the time and cost associated with processing imperfect devices through the entire manufacturing sequence while still ensuring final quality assurance
2Reliability
If inspections are performed at the conclusion of the manufacturing process, then device quality can be assured, but manufacturing costs increase due to discarding imperfect devices
Solution Approach 1:
The patent performs preliminary quality assessment during the fabrication process using scanning probe microscopy to identify imperfect devices at intermediate stages. This enables manufacturers to selectively terminate processing for devices that are likely to fail, thereby reducing the loss of materials and resources associated with processing and ultimately discarding defective devices, while maintaining quality assurance through continued inspection of promising devices
Solution Approach 2:
The patent enables selective discarding of imperfect devices at intermediate stages rather than processing them through the entire manufacturing sequence. By identifying defects early and selectively terminating processing for affected devices, the method reduces waste of materials, time, and resources that would otherwise be consumed in processing devices that will ultimately fail quality standards
3Reliability
If extensive processing is performed before determining device quality, then comprehensive quality assessment is achieved, but productivity decreases due to processing all devices through the same sequence
Solution Approach 1:
The patent performs preliminary quality assessment during intermediate stages of the fabrication process using scanning probe microscopy. This enables early identification of devices with defects, allowing manufacturers to selectively continue or terminate processing steps for individual devices. This approach maintains comprehensive quality assessment for devices that proceed through the full sequence while improving overall productivity by avoiding unnecessary processing of defective devices
Solution Approach 2:
The patent applies different processing strategies to different devices based on their individual quality characteristics. By using scanning probe microscopy to identify specific defects in specific devices, the method enables selective continuation or termination of processing steps for each device, rather than applying a uniform processing sequence to all devices. This localizes quality control actions to where they are most needed, maintaining comprehensive assessment where necessary while improving overall throughput
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 enables early detection and remediation of defects, reducing costs and improving yield by allowing for the selective continuation or termination of processing steps based on substrate quality assessments, thereby enhancing the efficiency of the manufacturing process.
Implementation Method 1
scanning a portion of the substrate surface with a scanning probe microscope to obtain data
Data Source
AI summary
Costs may be avoided and yields improved by applying scanning probe microscopy to substrates in the midst of an integrated circuit fabrication process sequence. Scanning probe microscopy may be used to provide conductance data. Conductance data may relate to device characteristics that are normally not available until the conclusion of device manufacturing. The substrates may be selectively treated to ameliorate a condition revealed by the data. Some substrates may be selectively discarded based on the data to avoid the expense of further processing. A process maintenance operation may be selectively carried out based on the data.