Stretched MP Gate Contact Layout for VFET Routing Congestion
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Solution Overview
Problem
The increasing transistor density in semiconductor integrated circuits leads to signal routing congestion due to the limited space for metal-to-gate contacts, which hinders efficient signal routing and increases complexity in the metallization layer.
Innovation Solution
The implementation of stretched-MP contacts, which extend beyond the active regions and couple multiple metal-to-gate contacts, reducing routing congestion by facilitating additional connections without the need for additional segments in the metallization layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transistor density is increased, then device functionality is improved, but signal routing congestion increases due to limited space for metal-to-gate contacts
Solution Approach 1:
The patent extends the MP contact in the first horizontal direction beyond the active regions, utilizing additional spatial dimension to facilitate signal routing. This stretched configuration allows the contact to connect to multiple MG contacts horizontally, effectively adding a routing dimension without increasing vertical layer complexity.
Solution Approach 2:
The stretched MP contact serves multiple functions simultaneously: it acts as a metal-to-gate contact, a signal routing conduit, and a connector for multiple MG contacts. By extending the contact beyond the active regions, a single structure performs what would traditionally require multiple separate elements, reducing overall routing complexity.
2Adaptability or versatility
If more metal-to-gate contacts are added, then device functionality is improved, but metallization layer complexity increases
Solution Approach 1:
The patent merges multiple signal routing functions into a single stretched MP contact structure. Instead of creating separate metallization paths for each connection, the extended contact consolidates multiple routing tasks into one continuous structure, thereby improving connectivity while reducing the number of discrete metallization elements required.
Solution Approach 2:
The stretched MP contact is designed to connect to multiple MG contacts simultaneously, making it a universal connector that serves multiple routing purposes. This multi-functional design allows a single contact structure to provide connectivity to several gates, reducing the overall complexity of the metallization layer.
Data Source
AI summary
A semiconductor device (having a VFET architecture) includes: first and second active regions (ARs); first and second metal-to-gate (MG) contacts proximal to channel regions of the first and second ARs; metal-to-source/drain (MD) contacts and buried MD (BMD) contacts correspondingly coupled to first and second S/D regions correspondingly of the first and second ARs; and a metal-to-gate (MP) contact at a same level as the MG contacts, and extending between and coupling together the first and second MG contacts; and relative to a first direction, the first and second ARs being substantially aligned; and at least a portion of the MP contact extending substantially beyond each of the first and second ARs relative to a perpendicular second direction.