Semiconductor Isolation Layout for Dense Flexible Interconnects
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Solution Overview
Problem
The challenge in semiconductor manufacturing is to reduce the size of circuit devices to increase integration levels while maintaining performance and cost-effectiveness, particularly in advanced nanotechnology process nodes.
Innovation Solution
A semiconductor structure is designed with specific arrangements of active and isolation areas, gate structures, and metal layers on a substrate, allowing for increased connectivity options and flexibility in back-end wiring, enabling the use of smaller semiconductor structural units to form complex circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the size of circuit device is reduced to increase integration level, then device density and integration level are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The semiconductor structure is divided into multiple regions (first region with first and second active areas, second region with third and fourth active areas) separated by isolation areas. Each region can be independently designed and manufactured, allowing complex circuits to be built from simpler modular units that can be tiled to achieve high density without proportionally increasing individual device complexity
Solution Approach 2:
The patent introduces multiple metal layers (first metal layer, second metal layer, third metal layer, fourth metal layer) stacked in the vertical dimension to provide additional wiring pathways. This multi-layer interconnect structure enables complex circuit connections without increasing the lateral footprint, thereby achieving high device density while managing complexity through vertical integration
2Area of stationary object
If the size of circuit device is reduced, then area is saved, but wiring flexibility and connectivity options are reduced
Solution Approach 1:
The patent employs a multi-layer metal interconnect structure with four distinct metal layers providing numerous possible connection paths between active areas. The non-coincident central axes of isolation areas create additional routing options. This vertical stacking and lateral offset arrangement provides extensive wiring flexibility within a compact footprint, enabling complex connectivity without increasing device area
Solution Approach 2:
The structure divides the device into multiple active areas (first, second, third, fourth active areas) separated by isolation areas with non-coincident central axes. This segmentation creates multiple independent routing zones that can be connected through various metal layer combinations, providing numerous connectivity options within a small area
Data Source
AI summary
Semiconductor structure and method of forming the same are provided. The structure includes a substrate. The substrate includes a first region and a second region arranged along a first direction. The first region includes a first isolation area. The second region includes a second isolation area. A central axis of the first isolation area parallel to the first direction does not coincide with a central axis of the second isolation area parallel to the first direction. The structure also includes a first gate structure on the first region, a first metal layer and a second metal layer on two sides of the first gate structure, a second gate structure on the second region, a third metal layer and a fourth metal layer on two sides of the second gate structure, a first isolation structure on the first isolation area, and a second isolation structure on the second isolation area.