Heterogeneous Gate Contacts for Integrated Circuit Layout Optimization
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Solution Overview
Problem
The increasing complexity and miniaturization of semiconductor devices limit the design of integrated circuits, making it challenging to create layouts that efficiently satisfy functional conditions, particularly due to issues with contact bridges and area constraints.
Innovation Solution
The integration of heterogeneous contacts in integrated circuits, where source/drain and gate contacts are designed with lower and upper components connected in a vertical direction, reducing horizontal cross-sectional areas and preventing contact bridges, allowing for more flexible placement and a simpler layout structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional contact structures are used in integrated circuits, then the layout area increases and contact bridge issues occur, but the functional conditions cannot be satisfied
Solution Approach 1:
The patent transitions from conventional planar contact structures to three-dimensional stacked contact structures. Multiple contacts (first, second, third, and fourth contacts) are arranged in vertical layers above the active region, allowing contacts to be positioned in the vertical dimension rather than competing for horizontal space. This dimensional transition prevents contact bridges while reducing the horizontal layout area.
Solution Approach 2:
The contact structure is segmented into multiple discrete contacts arranged in layers. Instead of using large, overlapping contact regions that risk bridging, the patent divides the contact function into separate first, second, third, and fourth contacts positioned at different vertical levels. Each contact can be independently formed and controlled, eliminating the bridging issue while maintaining electrical connectivity.
2Reliability
If contact area is increased to ensure proper electrical connection, then contact bridge issues occur, but if contact area is reduced, then connection reliability decreases
Solution Approach 1:
The patent resolves the contact area dilemma by moving contacts to the vertical dimension. Multiple contacts are stacked above the active region at different heights, allowing each contact to have sufficient area for reliable electrical connection without overlapping horizontally. The vertical stacking ensures proper connection reliability while the separated horizontal positions prevent bridge formation.
Solution Approach 2:
The electrical connection function is segmented into multiple separate contacts rather than relying on a single large contact area. The first, second, third, and fourth contacts are positioned at different vertical levels, with each providing a discrete electrical pathway. This segmentation allows each contact to be optimally sized for reliability without creating bridge risks through horizontal overlap.
3Adaptability or versatility
If more contacts are added to satisfy functional conditions, then layout complexity increases, but area constraints cannot be met
Solution Approach 1:
The patent accommodates multiple contacts required for functional conditions by utilizing the vertical dimension. The first, second, third, and fourth contacts are arranged in layers above the active region, allowing the layout to satisfy complex functional requirements without proportionally increasing horizontal area. The vertical stacking provides the necessary contact multiplicity within a compact footprint.
Solution Approach 2:
The contact structure employs a nested arrangement where multiple contacts are positioned within a compact vertical stack above the active region. The first, second, third, and fourth contacts are arranged in a nested configuration in the vertical dimension, allowing multiple functional connections to be integrated within a small horizontal footprint, thus meeting area constraints while satisfying functional requirements.
Data Source
AI summary
Provided is an integrated circuit which includes: a plurality of conductive lines extending in a first horizontal direction on a plane separate from a gate line, and including first and second conductive lines; a source/drain contact having a bottom surface connected to a source/drain region, and including a lower source/drain contact and an upper source/drain contact which are connected to each other in a vertical direction; and a gate contact having a bottom surface connected to the gate line, and extending in the vertical direction, in which the upper source/drain contact is placed below the first conductive line, and the gate contact is placed below the second conductive line. A top surface of the lower source/drain contact may be larger than a bottom surface of the upper source/drain contact.