NCEM Fill Cells for Semiconductor Defect Detection
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Solution Overview
Problem
Current semiconductor manufacturing processes lack effective methods for in-line monitoring of defects and process parameters during the production of semiconductor wafers and chips, particularly in identifying manufacturing failures such as shorts, leakages, and resistances, which can lead to inefficiencies and reduced product quality.
Innovation Solution
The integration of Non-Contact Electrical Measurements (NCEM)-enabled fill cells within standard cell logic regions, utilizing Design of Experiments (DOEs) to detect defects through voltage contrast inspection, allowing for the identification of manufacturing failures such as shorts, leakages, and resistances by varying parameters like size, spacing, and layer configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional contact-based measurement methods are used for defect detection, then measurement capability is achieved, but manufacturing time increases and productivity decreases
Solution Approach 1:
The patent replaces mechanical contact-based measurement systems with non-contact electrical measurement (NCEM) systems. Test structures are integrated into the semiconductor fabrication process, allowing electrical measurements to be performed without physical contact with the wafer surface, thereby eliminating the need for mechanical probing equipment and enabling in-line defect detection that does not slow down manufacturing.
Solution Approach 2:
The patent implements test structures during the fabrication process itself, before final product completion. By incorporating NCEM-capable test structures into the standard cell logic regions during manufacturing, the system enables real-time monitoring and defect detection at intermediate stages, allowing for immediate process adjustment without waiting for final product testing.
2Reliability
If comprehensive defect monitoring is implemented throughout the manufacturing process, then product quality improves, but process complexity increases
Solution Approach 1:
The patent creates test structures that serve multiple functions simultaneously. The same NCEM test structures integrated into standard cell logic regions are used to detect various types of defects including shorts, leaks, and resistance issues across different fabrication stages. This multi-functional approach eliminates the need for separate dedicated test structures for each defect type, thereby reducing overall process complexity while maintaining comprehensive quality monitoring.
Solution Approach 2:
The patent merges the test structure functionality with the standard cell logic region functionality. By integrating NCEM test structures into the existing standard cell architecture during normal logic region fabrication, the system combines production and testing functions into a single unified process, avoiding the need for separate testing infrastructure and reducing process complexity.
3Loss of time
If in-line NCEM measurements are implemented using integrated test structures, then real-time defect detection is achieved, but additional manufacturing steps are required
Solution Approach 1:
The patent incorporates NCEM test structures during the standard fabrication process flow, performing the measurement preparation in advance. By pre-integrating the test structures into the standard cell logic regions during normal manufacturing steps, the system enables immediate in-line measurements without requiring additional post-fabrication processing or separate testing equipment, thus reducing total defect detection time.
Solution Approach 2:
The patent enables the fabrication process itself to provide measurement capabilities. The NCEM test structures are designed to be self-testing, using the existing fabrication infrastructure and processes to perform measurements on themselves. This self-service approach eliminates the need for external testing equipment and additional manufacturing steps, as the process automatically monitors its own quality through the integrated test structures.
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
Enables real-time, efficient detection and characterization of manufacturing defects, improving the quality and yield of semiconductor wafers and chips by providing actionable data for process optimization and defect identification.
Implementation Method 1
utilizing Design of Experiments (DOEs) to detect defects through voltage contrast inspection, allowing for the identification of manufacturing failures such as shorts, leakages, and resistances
Data Source
AI summary
Improved processes for manufacturing wafers, chips, or dies utilize in-line data obtained from non-contact electrical measurements (“NCEM”) of fill cells that contain structures configured target/expose a variety of open-circuit, short-circuit, leakage, or excessive resistance failure modes. Such processes may involve evaluating Designs of Experiments (“DOEs”), comprised of multiple NCEM-enabled fill cells, in at least two variants, all targeted to the same failure mode(s).