Semiconductor Dummy Active Regions for Dishing Prevention
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Solution Overview
Problem
As semiconductor devices become more integrated and compact, manufacturing defects such as dishing effects and damage to edge regions become significant challenges, affecting the reliability and performance of these devices.
Innovation Solution
Incorporating dummy active regions between guard active regions surrounding memory cell and peripheral circuit regions in the semiconductor device substrate, which helps in preventing dishing effects during the manufacturing process and ensures the integrity of edge regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semiconductor devices are made more integrated and compact, then the degree of integration increases, but manufacturing defects such as dishing effects and edge region damage occur more frequently
Solution Approach 1:
The patent introduces dummy active regions as intermediary structures between the memory cell region and peripheral circuit region. These dummy active regions act as buffer zones that mediate the manufacturing process effects, absorbing dishing effects and preventing edge region damage while allowing high integration density in both functional regions.
Solution Approach 2:
The dummy active regions are formed in advance during the manufacturing process, before the final device structure is completed. This preliminary action of creating buffer regions prevents manufacturing defects from propagating to the functional areas, thereby protecting the reliability of the integrated device.
2Reliability
If guard active regions are used to surround memory cell and peripheral circuit regions, then edge region integrity is improved, but dishing effects occur during manufacturing
Solution Approach 1:
The dummy active regions serve as intermediary structures between the guard active regions and the functional regions. They absorb the manufacturing process variations and dishing effects that would otherwise affect the guard active regions and propagate to the functional areas, thereby maintaining both edge region integrity and manufacturing precision.
3Reliability
If dummy active regions are added between guard active regions, then manufacturing defects are prevented, but device structure complexity increases
Solution Approach 1:
The dummy active regions are designed with the same structure and properties as the regular active regions in the device. This homogeneity allows them to be formed using the same manufacturing processes without requiring additional complex steps, thereby preventing defects while minimizing the increase in device structure complexity.
4Area of stationary object
If compact patterns are used for high integration, then device size is reduced, but manufacturing defects increase
Solution Approach 1:
The patent segments the device structure by introducing dummy active regions that divide the substrate into distinct functional zones. This segmentation allows compact patterns to be used in the functional regions for high integration, while the dummy regions provide buffer zones that prevent manufacturing defects from occurring in the compact areas.
Data Source
AI summary
A semiconductor device includes a substrate having a first region and a second region, the first region including memory cells, and the second region including transistors for driving the memory cells, and device isolation regions disposed within the substrate to define active regions of the substrate. The active regions include a first guard active region surrounding the first region, a second guard active region surrounding a portion of the second region, and at least one dummy active region disposed between the first guard active region and the second guard active region.