Semiconductor Interconnect Isolation Trenches Against Electromigration
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Solution Overview
Problem
The increasing density of electrical connections in nitride semiconductor devices poses challenges for mass production due to reduced gaps between connections, necessitating improved yield rates and prevention of electromigration.
Innovation Solution
The integration of trenches in insulating layers between semiconductor circuit layers provides electrical isolation and increases the migration distance between circuits, preventing electromigration and enhancing connection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the density of electrical connections is increased to improve device integration, then the device functionality and power handling capability are improved, but the gap between connections is reduced which leads to electromigration and decreased manufacturing yield
Solution Approach 1:
The device structure is segmented by introducing trenches between adjacent electrical connections, dividing the continuous conductive path into isolated segments. This segmentation increases the migration distance for electrons, preventing electromigration while maintaining high connection density. The trenches create physical barriers that segment the current flow paths without reducing the overall integration density of the device.
2Area of stationary object
If the gap between electrical connections is reduced to increase integration density, then more connections can be packed in a smaller area, but electromigration occurs more frequently reducing manufacturing yield
Solution Approach 1:
Trenches are introduced as intermediary structures between adjacent electrical connections. These trenches serve as mediating elements that increase the effective migration distance without occupying excessive device area. The trenches are filled with insulating material that acts as a mediator to block electron migration paths while allowing the connections to remain closely spaced for high integration density.
3Reliability
If trenches are introduced to prevent electromigration and improve connection yield, then connection reliability is improved, but the device structure becomes more complex
Solution Approach 1:
The trench structure is applied locally only where needed between adjacent electrical connections that are prone to electromigration, rather than uniformly across the entire device. This localized application prevents electromigration in critical areas while minimizing the overall structural complexity addition. The trenches can be selectively positioned based on the specific layout and electromigration risk of different connection regions.
Data Source
AI summary
An integrated semiconductor device includes a substrate, semiconductor circuit layers, a first insulating layer, a second insulating layer, and an interconnection layer. The semiconductor circuit layers are disposed above the substrate. The semiconductor circuit layers have device portions and isolating portions, and the isolating portions are located among the device portions. The first insulating layer is disposed on the semiconductor circuit layers, and the second insulating layer is disposed on the first insulating layer, and the interconnection layer is disposed on the semiconductor circuit layers. The interconnection layer penetrates the first and second insulating layers to electrically connect the device portions of the semiconductor circuit layers. The second insulating layer or the first and second insulating layers collectively form one or more isolating structures above the isolating portion of the semiconductor circuit layers. The interconnection layer has a plurality of first circuits located above the device portions.