Recessed Interconnect Layout for Dense Semiconductor Routing
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Solution Overview
Problem
As semiconductor ICs scale down, reducing cell height and width to enhance integration density leads to routing issues, particularly in connecting interconnect structures, which can cause functional failures like short circuits.
Innovation Solution
Implementing recessed interconnect structures with partially or fully recessed portions filled with dielectric material, laterally shifting connection points to avoid misalignment and ensure sufficient width for interconnect structures, thereby maintaining routing integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cell height and width are reduced to enhance integration density, then production efficiency increases and costs decrease, but routing issues occur leading to interconnect structure misalignment and functional failures
Solution Approach 1:
The patent introduces a lateral dimension shift by recessing the interconnect structure connection point. Instead of maintaining vertical alignment only, the connection point is laterally offset within the gate structure, adding a horizontal dimension to the connection geometry. This dimensional change allows routing to accommodate reduced cell sizes while maintaining connection integrity.
Solution Approach 2:
The patent applies different structural qualities to different parts of the interconnect system. The interconnect structure is partially recessed only at the connection point with the gate structure, while other portions remain at the original level. This localized structural modification ensures proper electrical connection without affecting the overall routing architecture.
2Area of stationary object
If cell area is reduced to enhance integration density, then more devices fit on a single chip, but interconnect structure width becomes insufficient causing misalignment
Solution Approach 1:
The patent compensates for reduced interconnect width by utilizing lateral positioning within the gate structure. The recessed connection point provides additional lateral space, effectively increasing the available connection area without increasing the overall cell footprint. This dimensional utilization maintains alignment precision despite area reduction.
Solution Approach 2:
The interconnect structure is nested within the gate structure footprint by recessing it laterally. The connection point is positioned within the lateral bounds of the gate structure, effectively using the gate structure's lateral dimension to accommodate the interconnect connection. This nesting allows sufficient connection width within the reduced cell area.
Data Source
AI summary
A semiconductor device includes a first gate structure extending along a first lateral direction. The semiconductor device includes a first interconnect structure, disposed above the first gate structure, that extends along a second lateral direction perpendicular to the first lateral direction. The first interconnect structure includes a first portion and a second portion electrically isolated from each other by a first dielectric structure. The semiconductor device includes a second interconnect structure, disposed between the first gate structure and the first interconnect structure, that electrically couples the first gate structure to the first portion of the first interconnect structure. The second interconnect structure includes a recessed portion that is substantially aligned with the first gate structure and the dielectric structure along a vertical direction.