IC Layout Mark Patterns for Layer Alignment and Design Rule Checks
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Solution Overview
Problem
As semiconductor process technology advances, the increasing miniaturization of transistors in integrated circuits poses challenges in manufacturing, including the risk of violating product design rules and detecting alignment issues between layers, which can lead to manufacturing difficulties and reduced reliability.
Innovation Solution
The integrated circuit layout includes a combination of main, mark, and dummy areas with standard cell structures, where mark patterns are used to check alignment states and ensure compliance with design rules, thereby enhancing the reliability of the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transistor size is reduced to increase integration density, then the number of transistors per chip increases, but manufacturing process difficulty and design rule violation risk increase
Solution Approach 1:
The patent applies preliminary action by introducing marker patterns and dummy patterns during the layout design stage before manufacturing. These patterns are pre-configured to detect alignment issues and maintain design rule compliance, allowing potential manufacturing problems to be identified and corrected in the design phase rather than during actual fabrication, thus resolving the contradiction between high integration density and manufacturing ease
2Productivity
If transistor size is reduced to increase integration density, then more components can be integrated, but the risk of design rule violations increases
Solution Approach 1:
The patent uses marker patterns and dummy patterns as intermediary elements that mediate between the main circuit patterns and design rule constraints. These intermediary patterns are specifically designed to maintain proper spacing, alignment, and design rule compliance while allowing high-density integration of functional components, thus resolving the contradiction between integration count and design rule compliance
3Measurement precision
If conventional marker patterns are used for alignment checking, then alignment can be verified, but design rule violations may occur and risks may not be detected
Solution Approach 1:
The patent applies local quality by creating distinct pattern types with different functions: marker patterns for alignment verification and dummy patterns for design rule compliance. Each pattern type has locally optimized characteristics - marker patterns are positioned and sized for precise alignment measurement, while dummy patterns are configured to maintain design rule margins. This localized differentiation resolves the contradiction between alignment precision and design rule compliance
4Measurement precision
If more marker patterns are added for better alignment checking, then alignment accuracy improves, but layout complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the layout into distinct functional zones: main circuit areas, marker pattern areas, and dummy pattern areas. This segmentation allows alignment checking to be performed in dedicated marker zones without complicating the main circuit design. The segmented approach provides accurate alignment verification while maintaining manageable layout complexity by confining measurement functions to specific regions
Data Source
AI summary
An integrated circuit layout includes: a first chip area; and a second chip area, wherein the first chip area includes: a first main area including a first main pattern; a first mark area adjacent to the first main area, wherein a first mark pattern is formed in the first mark area; and a first dummy area including a first dummy pattern, wherein the second chip area includes: a second main area including a second main pattern; a second mark area adjacent to the second main area, wherein a second mark pattern is formed in the second mark area; and a second dummy area including a second dummy pattern, wherein the first and second mark patterns are used to check alignment states of the first chip area and the second chip area, respectively, and wherein each of the first and second mark patterns has a standard cell structure.