Dummy Contact Layout for Etchant-Open IC Contact Plugs
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Solution Overview
Problem
As semiconductor devices become increasingly complex and integrated to meet demands for high reliability and multi-functionality, existing technologies face challenges in effectively integrating dummy contacts within active regions to enhance electrical connectivity and reduce manufacturing defects.
Innovation Solution
The integration circuit device incorporates a dummy contact on a single diffusion break region, with a conductive pattern and a vertical extension that covers the upper sidewall of the conductive pattern, and includes a source/drain contact and a gate contact with a conductive barrier pattern, allowing for improved electrical connectivity and reduced defects during the hole etching process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dummy contact is integrated within an active region to enhance electrical connectivity, then electrical connectivity is improved, but the risk of blocking etchant flow into gate contact holes increases
Solution Approach 1:
The conductive pattern is designed with non-uniform thickness, being thicker at the lower portion and thinner at the upper portion. This local variation in thickness creates a gradient structure that allows etchant to flow underneath the conductive pattern while maintaining electrical connectivity where needed, thus resolving the contradiction between improving electrical connectivity and preventing etchant blockage.
Solution Approach 2:
The solution transitions from a two-dimensional planar contact structure to a three-dimensional vertically-grown conductive pattern. By growing the conductive pattern vertically from the substrate surface, etchant can flow laterally underneath it, preventing blockage while the vertical extension maintains electrical connectivity. This dimensional change resolves the contradiction by allowing etchant access from a different spatial direction.
2Reliability
If the conductive pattern is made thicker to improve electrical connectivity, then electrical connectivity is improved, but the blockage of etchant flow is worsened
Solution Approach 1:
The conductive pattern employs spatially varying thickness with a gradient from thicker lower portion to thinner upper portion. This local quality variation allows the lower thick section to provide strong electrical connectivity while the upper thin section permits etchant flow, resolving the contradiction between connectivity and etchant access.
Solution Approach 2:
By growing the conductive pattern vertically in the third dimension rather than expanding it laterally, the design achieves enhanced electrical connectivity through vertical extension while maintaining lateral openness for etchant flow. This dimensional approach decouples the trade-off between thickness and etchant accessibility.
3Object-affected harmful factors
If the conductive pattern is made thinner to allow etchant flow, then etchant flow is improved, but electrical connectivity is worsened
Solution Approach 1:
The conductive pattern uses non-uniform thickness distribution with the thinner upper portion allowing etchant flow while the thicker lower portion maintains electrical connectivity. This local differentiation resolves the contradiction by assigning different thickness functions to different spatial regions of the same structure.
Solution Approach 2:
The vertical growth of the conductive pattern from the substrate creates a three-dimensional structure where connectivity is achieved through vertical extension rather than lateral thickness. This allows the pattern to be thin at the surface for etchant access while maintaining sufficient conductive path length below, resolving the connectivity-versus-flow contradiction.
4Object-affected harmful factors
If the conductive pattern is made asymmetric in thickness to improve etchant flow, then etchant flow is improved, but manufacturing precision is worsened
Solution Approach 1:
The asymmetric thickness profile of the conductive pattern is established during the initial formation process before subsequent manufacturing steps. By pre-defining the thickness gradient in the lower portions, the design simplifies later processing and reduces the precision requirements for subsequent operations, resolving the contradiction between asymmetric geometry and manufacturing precision.
Solution Approach 2:
The conductive pattern implements local thickness variation with asymmetric lower portions and more uniform upper portions. This localized asymmetry is confined to specific regions where it serves the etchant flow function, while other regions maintain uniformity for manufacturing control, thus resolving the contradiction between asymmetric design and manufacturing precision.
Data Source
AI summary
An integrated circuit device includes a first conductive pattern disposed on a substrate, a second conductive pattern surrounding a portion of the first conductive pattern and covering a lower portion of a sidewall of the first conductive pattern, an upper insulation structure on the first conductive pattern and the second conductive pattern, and an upper conductive pattern penetrating through the upper insulation structure and extending in a vertical direction, wherein the upper conductive pattern includes a main plug portion overlapping the first conductive pattern and the second conductive pattern in the vertical direction, and a vertical extension extending from a portion of the main plug portion toward the substrate, covering an upper of the upper sidewall of the first conductive pattern, and overlapping the second conductive pattern in the vertical direction, and a dummy contact is formed on a single diffusion break region on the substrate.