Test Transistor Layout With Alternating Gate Spacing for Contact Defects
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Solution Overview
Problem
Existing semiconductor manufacturing processes require significant time and resources to identify defects in integrated circuit chips, particularly in contact connections to active regions, which are not efficiently detected until after the manufacturing process is complete.
Innovation Solution
A test element group with a specific layout of gate lines and metal wirings is introduced, allowing for early detection of contact defects by varying the spacing between gate lines to accelerate defect identification during the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional test element groups are used with uniform gate line spacing, then the manufacturing process is simple, but contact defects cannot be detected early in the manufacturing process
Solution Approach 1:
The patent applies local quality by creating different gate line spacing configurations in different regions of the test element group. Specifically, a first region has a first gate line spacing while a second region has a second gate line spacing that is different from the first. This allows certain areas to be more sensitive to contact defects while maintaining overall structural integrity and enabling early defect detection without requiring complete redesign of the entire test structure.
Solution Approach 2:
The test element group is segmented into multiple regions with different gate line spacing characteristics. The patent divides the test structure into a first region and a second region, where each region has deliberately different gate line spacing. This segmentation allows independent optimization of defect detection sensitivity in different areas and enables the system to detect various types of contact defects that might be missed in uniform spacing configurations.
2Loss of time
If test element groups are designed to detect contact defects early, then defect detection capability improves, but manufacturing complexity increases
Solution Approach 1:
The patent implements preliminary action by incorporating the varied gate line spacing configuration directly into the test element group design at the planning stage. The different gate line spacing regions are pre-configured in the layout before manufacturing, allowing defect detection capabilities to be built-in from the outset. This eliminates the need for additional post-manufacturing testing or complex adaptive adjustments, thereby reducing the overall process development period while maintaining manufacturing feasibility.
3Manufacturing precision
If uniform gate line spacing is used, then manufacturing is easier, but defect detection sensitivity is reduced
Solution Approach 1:
The patent applies local quality by creating different gate line spacing configurations in different regions of the test element group. Specifically, a first region has a first gate line spacing while a second region has a second gate line spacing that is different from the first. This allows certain areas to be more sensitive to contact defects while maintaining overall structural integrity and enabling early defect detection without requiring complete redesign of the entire test structure.
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 the defect rate and shortens the process development period by enabling early detection of contact defects, thereby improving the efficiency and reliability of semiconductor manufacturing.
Implementation Method 1
a test circuit electrically connected to a portion of the plurality of metal wirings and configured to measure resistance of the plurality of test transistors
Data Source
AI summary
A test device includes semiconductor substrate, gate lines disposed on an upper surface of the semiconductor substrate and extending in a first direction parallel to the upper surface, a test element group including test transistors defined by the gate lines and by active regions extending in a second direction perpendicular to the first direction and intersecting the gate lines, and metal wirings disposed on the semiconductor substrate and electrically connected to the active regions and/or the gate lines, and a test circuit electrically connected to the metal wirings and configured to measure resistance of the test transistors. The gate lines include first gate lines and second gate lines disposed alternately, with the spacing between first gate lines and second gate lines alternating between a first distance and a second distance greater than the first distance.