Semiconductor Conductive Features Over Active Regions
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Solution Overview
Problem
The miniaturization of integrated circuits poses challenges in achieving efficient electrical connections and isolation structures within semiconductor devices, requiring innovative solutions to maintain performance and reduce manufacturing complexity.
Innovation Solution
The semiconductor device incorporates a specific configuration of conductive features and spacers over active and isolation regions, with multiple conductive layers (MD1, MP, and MD2) and insulating layers to provide electrical connections and isolation, allowing for efficient electrical contact and reduced manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive features are placed over active regions to enhance electrical connectivity, then electrical connection efficiency is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple conductive layers (first conductive layer, second conductive layer) into a unified conductive feature structure that extends over active regions. This merging approach enhances electrical connectivity while managing complexity through integrated design rather than separate components.
Solution Approach 2:
The conductive features serve multiple functions: providing electrical connections to active regions, acting as part of the isolation structure, and enabling signal routing. This multi-functionality reduces the need for separate dedicated structures, thereby managing device complexity while improving connection efficiency.
2Reliability
If multiple conductive layers and insulating layers are used to provide electrical connections and isolation, then electrical connectivity is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent divides the conductive structure into multiple layers (first conductive layer, second conductive layer) with insulating layers in between. This segmentation allows each layer to be optimized for specific electrical connection requirements while maintaining manufacturability through standardized layering processes.
Solution Approach 2:
The patent varies the configuration parameters of conductive and insulating layers (thickness, material composition, spatial arrangement) to achieve optimal electrical connectivity. These parameter changes are implemented within existing manufacturing process capabilities, balancing performance improvement with manufacturing ease.
3Reliability
If a larger contact area is provided to gate structures, then electrical connectivity is improved, but device size increases
Solution Approach 1:
The patent extends conductive features vertically across multiple layers to increase contact area with gate structures. By utilizing the vertical dimension rather than only horizontal expansion, the device achieves larger effective contact area without proportionally increasing the device footprint.
Data Source
AI summary
A semiconductor device includes a substrate having an active region, a first gate structure over a top surface of the substrate, a second gate structure over the top surface of the substrate, a pair of first spacers on each sidewall of the first gate structure, a pair of second spacers on each sidewall of the second gate structure, an insulating layer over at least the first gate structure, a first conductive feature over the active region and a second conductive feature over the substrate. Further, the second gate structure is adjacent to the first gate structure and a top surface of the first conductive feature is coplanar with a top surface of the second conductive feature.