Semiconductor Cell Layout With Cutting Patterns for Cell Isolation
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Solution Overview
Problem
Reduced power areas in semiconductor devices lead to increased susceptibility to electric shorts between neighboring cells due to insufficient separation, as standard cells of smaller size are more prone to electrical contact.
Innovation Solution
A semiconductor device design featuring alternately arranged cell and power areas with cutting patterns in the power areas to separate gate structures and junction layers, preventing electrical shorts by restricting horizontal growth of junction layers and maintaining separation between cell areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the power area size is reduced to increase cell area, then the integration density is improved, but the reliability deteriorates due to increased susceptibility to electric shorts between neighboring cells
Solution Approach 1:
The power area is segmented by introducing cutting patterns that divide it into multiple regions. These cutting patterns create physical barriers that prevent electrical shorts between neighboring cells while maintaining the reduced power area size, thus resolving the contradiction between integration density and electrical isolation.
Solution Approach 2:
Cutting patterns are introduced as intermediary structures within the power area. These patterns act as mediators that provide electrical isolation between neighboring cells without requiring additional space, enabling both high integration density and reliable electrical separation.
2Productivity
If the standard cell size is reduced to increase integration density, then the productivity is improved, but the reliability worsens due to increased susceptibility to electric shorts
Solution Approach 1:
The standard cell structure is segmented by introducing cutting patterns that create isolated regions. This segmentation allows smaller cell sizes for higher integration density while maintaining reliable electrical isolation through the cutting patterns that prevent unintended electrical connections.
Solution Approach 2:
The isolation mechanism is moved from the horizontal plane to the vertical dimension by introducing cutting patterns that extend through multiple layers. This dimensional approach allows compact cell layouts while providing robust electrical isolation through the depth of the cutting patterns.
3Device complexity
If the power area is reduced to increase cell area, then the device complexity is reduced, but the manufacturing precision requirement increases to prevent electric shorts
Solution Approach 1:
Cutting patterns are formed in advance during the manufacturing process, before final device assembly. This preliminary action ensures that isolation structures are already in place to prevent electric shorts, reducing the need for high-precision adjustments in later manufacturing stages.
Solution Approach 2:
The cutting patterns are designed to self-align with surrounding structures through geometric constraints and fabrication process characteristics. This self-alignment mechanism reduces the manufacturing precision requirements by eliminating the need for complex alignment procedures.
Data Source
AI summary
A semiconductor device includes a substrate having cell areas and power areas that are alternately arranged in a second direction. Gate structures extend in the second direction. The gate structures are spaced apart from each other in a first direction perpendicular to the second direction. Junction layers are arranged at both sides of each gate structure. The junction layers are arranged in the second direction such that each of the junction layer has a flat portion that is proximate to the power area. Cutting patterns are arranged in the power areas. The cutting patterns extend in the first direction such that each of the gate structures and each of the junction layers in neighboring cell areas are separated from each other by the cutting pattern.