Semiconductor Wiring Patterns with Intermediary Assist Structures
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Solution Overview
Problem
In highly integrated semiconductor devices, light interference during the exposure process causes wiring patterns to adhere to each other, leading to potential short circuits.
Innovation Solution
Incorporating assist patterns that are parallel to and spaced apart from the main wiring patterns, these assist patterns are connected to the main patterns and arranged in a way that prevents light interference, ensuring the main patterns do not overlap and thus reducing the likelihood of adhesion and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple wiring patterns are placed close together to increase integration, then device functionality is improved, but light interference causes patterns to adhere and short circuits occur
Solution Approach 1:
An assist pattern is introduced as an intermediary element between the first and second wiring patterns. This assist pattern absorbs excess light during exposure, preventing light interference between adjacent patterns and eliminating the adhesion problem while allowing high-density wiring layouts
Solution Approach 2:
The assist pattern modifies the local light absorption parameters in the exposure process. By adding this intermediate pattern, the light distribution is changed to prevent unwanted interference effects between closely spaced wiring patterns
2Reliability
If wiring patterns are spaced apart to prevent adhesion, then short circuit risk is reduced, but area utilization decreases
Solution Approach 1:
The assist pattern serves as a mediator that enables closer spacing of wiring patterns by absorbing interfering light. This allows the design to achieve both high area utilization and reliable pattern separation without requiring excessive spacing
3Manufacturing precision
If assist patterns are added to prevent light interference, then pattern separation is improved, but device complexity increases
Solution Approach 1:
The assist pattern is a simple intermediate structure that solves the complex light interference problem. Although it adds one more pattern element, the solution remains manufacturable using standard photolithography processes and does not require complex additional steps
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 solution effectively prevents the adhesion of wiring patterns, enhancing the reliability of semiconductor devices by allowing independent voltage application to each pattern and improving pattern uniformity, thereby reducing the risk of short circuits.
Implementation Method 1
a plurality of patterns adhere to one another due to a light interference phenomenon occurring in an exposure process
Data Source
AI summary
A semiconductor device includes a first metal wiring pattern area, and a second metal wiring pattern area that does not overlap the first metal wiring pattern area in a plan view. The first metal wiring pattern area includes a first pattern, the second metal wiring pattern area includes a second pattern that is spaced apart from the first pattern and includes one or more lines. The first metal wiring pattern area includes an assist pattern comprising one or more lines. The assist pattern is spaced apart from the second pattern, parallel with the second pattern, and is between the first pattern and the second pattern. One end of the assist pattern is connected to the first pattern.