IC Inspection Pattern Layout for High-Density Defect Detection
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Solution Overview
Problem
The increasing complexity and circuit packing density of integrated circuits require advanced detection technologies for detecting defects with high operational precision during processing and fabrication.
Innovation Solution
A pattern design for integrated circuits incorporating floating and grounded conductive lines, comb lines, and serpentine lines, along with a defect inspection method using a particle beam to generate and analyze voltage contrast images for defect detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If circuit packing density is increased to improve integration, then more circuits can be fabricated on substrates, but defect detection becomes more difficult and requires higher operational precision
Solution Approach 1:
The pattern design is divided into multiple conductive lines (first floating conductive line, second floating conductive line, and grounded conductive line) with distinct regions (main pad region, subregions, sub-pad regions, ground region). This segmentation allows defects to be localized to specific segments rather than the entire dense circuit, improving detectability despite high packing density
Solution Approach 2:
The grounded conductive line is positioned between the first and second floating conductive lines to serve as an intermediary reference structure. This intermediary element provides a stable reference for comparison during inspection, enabling more accurate defect detection in the high-density circuit environment
2Device complexity
If design complexity increases to accommodate higher integration, then more sophisticated detection technology is needed, but inspection time and resources increase
Solution Approach 1:
The pattern design is divided into multiple conductive lines (first floating conductive line, second floating conductive line, and grounded conductive line) with distinct regions (main pad region, subregions, sub-pad regions, ground region). This segmentation allows defects to be localized to specific segments rather than the entire dense circuit, improving detectability despite high packing density
Solution Approach 2:
Different regions of the pattern design have specialized structures optimized for their specific functions: main pad regions for primary connections, sub-pad regions for secondary connections, and ground regions for reference. This local optimization enables targeted inspection strategies that reduce overall inspection time while maintaining high detection precision
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
Enhances defect detection precision by providing a structured pattern design and inspection method, enabling accurate identification of defects in integrated circuits.
Implementation Method 1
scanning a main pad region formed at a first end portion of a pattern design using a particle beam and generating main pad information; scanning a first sub-pad region formed at a first end portion of a first subregion of the pattern design using the particle beam
Data Source
AI summary
A pattern design for defect inspection, the pattern design including a first floating conductive line; a second floating conductive line; and a grounded conductive line disposed between the first floating conductive line and the second floating conductive line. The first floating conductive line, the second floating conductive line, and the grounded conductive line are divided into a main pad region, a plurality of subregions, a plurality of sub-pad regions, and a ground region. The main pad region is positioned at a first end portion of the pattern design. The ground region is positioned at a second end portion of the pattern design. The plurality of subregions and the plurality of sub-pad regions are positioned between the main pad region and the ground region.