Interconnect Isolation Layout for Reduced Capacitive Coupling
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Solution Overview
Problem
Existing semiconductor technologies face challenges in minimizing capacitive coupling between interconnect structures and gate structures, leading to signal interference and performance issues due to the shared common node in transistors.
Innovation Solution
Incorporating a dielectric structure, such as an isolation layer, between the interconnect structure and the common source/drain structure to electrically isolate the interconnect from the common node, thereby minimizing capacitive coupling and stabilizing signals on neighboring gate structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If interconnect structure is placed over common source/drain structure to save area, then integration density is improved, but capacitive coupling between interconnect and gate structures increases causing signal interference
Solution Approach 1:
A dielectric structure is introduced as an intermediary layer between the interconnect structure and the common source/drain structure. This dielectric layer acts as a mediator that reduces the capacitive coupling effect between the interconnect and the gate structures while still allowing the interconnect to be positioned over the common source/drain structure for area efficiency.
Solution Approach 2:
The common source/drain structure is segmented into multiple regions, with the dielectric structure selectively positioned over portions of it. This segmentation allows the interconnect to be electrically isolated from specific gate structures while maintaining electrical connection to the common node through the exposed portions of the source/drain structure.
2Device complexity
If interconnect structure is electrically connected to common node, then signal routing is simplified, but signal interference and voltage fluctuations on neighboring gate structures increase
Solution Approach 1:
The dielectric structure is selectively positioned only over portions of the common source/drain structure that are adjacent to sensitive gate structures. This local application of the dielectric material provides capacitive coupling reduction exactly where needed, while leaving other portions of the source/drain structure exposed to maintain simple electrical connection to the common node.
3Productivity
If minimum feature size is reduced to increase integration density, then more components fit in given area, but capacitive coupling effects become more significant
Solution Approach 1:
Instead of horizontally separating the interconnect from the common source/drain structure (which would increase area), the dielectric structure is introduced in the vertical dimension between them. This allows the interconnect to remain positioned over the common source/drain structure for area efficiency while the dielectric layer provides vertical isolation to reduce capacitive coupling.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively reduces signal interference and voltage fluctuations, enhancing the overall performance of semiconductor devices by isolating the interconnect structure from the common node and allowing it to be tied to a power supply voltage for noise resistance.
Implementation Method 1
capacitive coupling between interconnect structures and gate structures
Implementation Method 2
a dielectric structure interposed between the interconnect structure and the common source/drain structure
Data Source
AI summary
A semiconductor device includes a first source/drain structure and a second source/drain structure of a first transistor. The semiconductor device includes a first source/drain structure and a second source/drain structure of a first transistor. The semiconductor device includes a third source/drain structure and a fourth source/drain structure of a second transistor. The second source/drain structure and the third source/drain structure merges as a common source/drain structure. The semiconductor device includes a first interconnect structure extending along a first lateral direction and disposed above the common source/drain structure. The semiconductor device includes a first dielectric structure interposed between the first interconnect structure and the common source/drain structure.