Asymmetric Node Contact for SRAM Electrical Short Prevention
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Solution Overview
Problem
Highly integrated semiconductor devices face electrical shorts between gate electrodes and node contacts in SRAM cells due to narrow margins, which can compromise the reliability and performance of the devices.
Innovation Solution
The configuration of node contacts with one end closer to a specific gate structure and the other end spaced further away from adjacent gate structures, reducing the likelihood of electrical shorts by adjusting the distances between the node contact and the gate structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the node contact is spaced apart from adjacent gate structures at approximately the same distance, then the device structure is simple and symmetric, but the risk of electrical shorts increases in highly integrated memory devices due to small margins
Solution Approach 1:
The patent applies asymmetry by configuring the node contact such that one end is positioned closer to a first gate structure while the other end is positioned closer to a second gate structure, rather than maintaining symmetric spacing. This asymmetric positioning creates larger clearance margins with adjacent gate structures, thereby reducing the risk of electrical shorts in highly integrated memory devices.
Solution Approach 2:
The patent applies local quality by differentiating the spacing configuration at different locations of the node contact. Specifically, the first end of the node contact is spaced from the first gate structure at a first distance, while the second end is spaced from the second gate structure at a second distance, allowing optimized local clearance at each position to prevent electrical shorts.
2Reliability
If the node contact is positioned closer to one gate structure than the other, then electrical shorts are minimized, but the symmetric structure is lost
Solution Approach 1:
The patent deliberately introduces asymmetry in the node contact positioning relative to adjacent gate structures. The first end of the node contact is positioned at a different distance from its adjacent gate structure compared to the distance of the second end from its adjacent gate structure. This asymmetric configuration prioritizes electrical short prevention over structural symmetry.
3Productivity
If the distances between node contact and gate structures are reduced for high integration, then device density increases, but the margin for electrical shorts decreases
Solution Approach 1:
The patent applies local quality by optimizing the spacing at different locations of the node contact independently. The first end is spaced from the first gate structure at a first distance, while the second end is spaced from the second gate structure at a second distance, allowing each location to have optimized clearance that prevents electrical shorts while maintaining overall high integration density.
Solution Approach 2:
The patent uses asymmetric positioning where the node contact's first end is closer to its adjacent gate structure than the second end is to its adjacent gate structure (or vice versa). This asymmetric configuration allows one end to maintain larger clearance for reliability while the other end can be positioned closer to achieve high integration density.
Data Source
AI summary
Disclosed is a semiconductor device including a first active pattern and a second active pattern that extend in a first direction on a substrate and are spaced apart from each other in a second direction crossing the first direction, a first gate structure that extends across the first and second active patterns, a second gate structure that is spaced apart from the first gate structure, and a node contact between the first and second gate structures that electrically connects the first active pattern and the second active pattern to each other. The node contact comprises a first end adjacent to the first active pattern and a second end adjacent to the second active pattern. The second end of the node contact being shifted in the first direction relative to the first end of the node contact so as to be closer to the second gate structure than to the first gate structure.