Semiconductor Device Deep Trench Isolation Integration
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Solution Overview
Problem
Conventional high-voltage semiconductor devices require non-operation regions for electrical isolation, which limits integration density and operational efficiency due to the need for additional space and increased device size.
Innovation Solution
The implementation of a deep trench isolation (DTI) process to form an isolation layer that surrounds active regions, allowing the gate electrode to extend over the isolation layer, thereby eliminating the need for non-operation regions and enhancing integration density while maintaining sufficient operational voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If junction isolation is used to isolate adjacent active regions, then electrical isolation between active regions is achieved, but non-operation regions are required which reduce integration density
Solution Approach 1:
The patent transitions from planar junction isolation to three-dimensional deep trench isolation. The isolation layer extends vertically into the substrate, providing electrical isolation through the depth dimension rather than relying on lateral non-operation regions. This allows active regions to be closely spaced in the planar direction while maintaining isolation through the vertical trench structure.
Solution Approach 2:
The patent extracts the isolation function from the planar active region area and places it in the vertical substrate depth. By forming deep trenches that extend into the substrate and filling them with isolation material, the isolation function is separated from the operational area, eliminating the need for non-operation regions and allowing 100% area utilization.
2Reliability
If non-operation regions are included to ensure isolation and operating voltage, then sufficient voltage operation is maintained, but device area increases reducing integration density
Solution Approach 1:
The patent moves the isolation mechanism from the lateral plane to the vertical dimension. Deep trenches extending into the substrate provide both voltage isolation and electrical isolation without consuming lateral device area. The gate electrode can extend to the substrate surface over the trench regions, utilizing the vertical space for isolation functions.
Solution Approach 2:
The patent enables dynamic area utilization where the entire device region becomes operational. By eliminating static non-operation regions through deep trench isolation, 100% of the device area can participate in carrier transfer operations, maximizing integration density while maintaining voltage characteristics.
3Productivity
If deep trench isolation is implemented to eliminate non-operation regions, then integration density increases, but manufacturing complexity increases
Solution Approach 1:
The patent segments the substrate into isolated regions using deep trenches filled with dielectric material. This segmentation approach divides the continuous substrate into electrically isolated compartments, allowing independent operation of adjacent active regions while maximizing area utilization. The trench structure is formed through standard semiconductor fabrication processes.
Solution Approach 2:
The deep trench isolation layer acts as an intermediary structure between adjacent active regions. By filling the trenches with dielectric material, an intermediate isolation medium is introduced that provides both electrical isolation and mechanical support, enabling the gate electrode to extend over the trench regions without direct contact between adjacent active regions.
Data Source
AI summary
A semiconductor device includes a substrate with one or more active regions and an isolation layer formed to surround an active region and to extend deeper into the substrate than the one or more active regions. The semiconductor further includes a gate electrode, which covers a portion of the active region, and which has one end; portion thereof extending over the isolation layer.