Semiconductor M0 Layer Electrical Connectivity via MD2 Segments
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Solution Overview
Problem
Current semiconductor device manufacturing methods require multiple metal and via layers for electrical connections, increasing manufacturing time, cost, and size, while existing approaches do not efficiently reduce these factors.
Innovation Solution
The implementation of a semiconductor device structure with a lowermost metal layer (M0) and via layer (V0) that reduces the need for higher metal and via layers by forming electrical connections using an upper part of the M0 layer, specifically through the MD2 layer, which is electrically isolated from the MD1 layer in certain regions, thereby minimizing manufacturing time, cost, and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple metal and via layers are used for electrical connections, then electrical connectivity is improved, but manufacturing time and cost increase
Solution Approach 1:
The patent merges the functions of multiple metal layers and via layers into a single metal layer by forming electrical connections through openings in the dielectric layer that directly access the metal layer, eliminating the need for separate via structures and reducing the total number of manufacturing steps
2Reliability
If multiple metal and via layers are used for electrical connections, then electrical connectivity is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the functions of multiple metal layers and via layers into a single metal layer by forming electrical connections through openings in the dielectric layer that directly access the metal layer, eliminating the need for separate via structures and reducing the total number of manufacturing steps
Solution Approach 2:
The patent extracts and eliminates the via layer from the traditional multi-layer metal structure, using only the metal layer itself to provide electrical connections through dielectric openings, thereby simplifying the manufacturing process and reducing costs
3Reliability
If multiple metal and via layers are used for electrical connections, then electrical connectivity is improved, but device size increases
Solution Approach 1:
The patent merges the functions of multiple metal layers and via layers into a single metal layer by forming electrical connections through openings in the dielectric layer that directly access the metal layer, eliminating the need for separate via structures and reducing the total number of manufacturing steps
Solution Approach 2:
The patent transitions from a vertical stacking approach with multiple metal layers to a planar approach where electrical connections are formed by accessing the metal layer through dielectric openings, effectively using the dielectric layer as the intermediary dimension rather than adding more metal layers
4Device complexity
If the upper part of the lowermost metal layer is used for electrical connections, then manufacturing complexity is reduced, but electrical isolation requirements increase
Solution Approach 1:
The patent applies local quality by forming openings in the dielectric layer at specific locations where electrical connections are needed, allowing the metal layer to be electrically connected in some regions while remaining isolated in other regions, thus achieving both connectivity and isolation requirements locally
Data Source
AI summary
A semiconductor device includes a substrate having an active area, a gate structure over the active area, a lower conductive layer over and electrically coupled to the active area, and an upper conductive layer over and electrically coupled to the lower conductive layer. The lower conductive layer is at least partially co-elevational with the gate structure. The lower conductive layer includes first and second conductive segments spaced from each other. The upper conductive layer includes a third conductive segment overlapping the first and second conductive segments. The third conductive segment is electrically coupled to the first conductive segment, and electrically isolated from the second conductive segment.