Connector Tab Interconnect Layout Without Extra Metallization
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Solution Overview
Problem
Interconnect structures in semiconductor technology often require additional vertical space and introduce resistance due to the need for separate metallization levels to connect parallel electrically conductive line structures, which affects device performance and efficiency.
Innovation Solution
A substrative patterning process that forms a connector tab between two adjacent electrically conductive line structures within the same metallization level, using a patterned hard mask and sacrificial gap fill material to create a unitary interconnect structure that reduces vertical real estate and avoids added resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate metallization levels are used to connect parallel electrically conductive line structures, then electrical connection between lines is achieved, but vertical real estate is consumed and additional resistance is introduced
Solution Approach 1:
The invention transitions from a vertical connection approach (using separate metallization levels) to a horizontal connection approach (using connector tabs within the same metallization level). This dimensional change allows electrical connection between parallel conductive lines without consuming additional vertical space, as the connector tabs extend laterally from the conductive lines within the same planar level.
Solution Approach 2:
The invention merges the connector tab structure with the existing metallization level, combining the connection function into the same layer rather than requiring a separate layer. The connector tabs are formed as integral extensions of the conductive lines within the same metallization level, eliminating the need for additional vertical stacking of metallization layers.
2Reliability
If separate metallization levels are used to connect parallel electrically conductive line structures, then electrical connection between lines is achieved, but additional resistance is introduced
Solution Approach 1:
The connector tabs are formed as integral extensions of the conductive lines within the same metallization level, creating a continuous conductive path without interfaces between different layers. This merging eliminates the additional resistance that would arise from vias, contacts, or interfaces between separate metallization levels, as the entire connection structure is composed of the same conductive material in a single level.
Solution Approach 2:
The connection structure is segmented into connector tabs that are laterally extended from the conductive lines, creating multiple parallel conductive paths within the same metallization level. This segmentation approach distributes the connection function across multiple tabs rather than requiring a single vertical via path, thereby reducing overall resistance.
3Reliability
If upper or lower electrically conductive routing layers are used to couple parallel line structures, then electrical coupling is achieved, but device complexity increases
Solution Approach 1:
The invention merges the coupling function into the same metallization level by forming connector tabs that laterally extend from conductive lines. This eliminates the need for separate upper or lower routing layers, thereby simplifying the interconnect structure by reducing the number of metallization levels and associated processing steps while maintaining electrical coupling functionality.
Data Source
AI summary
A substrative patterning process is provided that forms an interconnect structure including a connector tab located between two adjacent electrically conductive line structures. The connector tab and the two adjacent electrically conductive line structures are of unitary construction and are located in a same metallization level.