Semiconductor Isolation Region Structure for Hot Electron Inhibition
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Solution Overview
Problem
As semiconductor devices integrate more closely, maintaining electrical characteristics and reliability becomes challenging due to reduced feature sizes and active region dimensions, requiring effective isolation techniques to prevent deterioration.
Innovation Solution
The semiconductor device employs a unique isolation region structure with multiple insulating layers and trench isolation materials to define active regions, ensuring proper electrical separation and reliability, even at fine pitches, by using a combination of oxide and nitride materials with specific thicknesses and configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If feature size of semiconductor devices is reduced to increase integration, then device density increases, but electrical characteristics deteriorate and reliability decreases
Solution Approach 1:
The patent applies different insulating materials with different dielectric constants to different regions of the isolation structure. High-k insulating material is used in specific areas where stronger electrical isolation is needed, while low-k material is used in other areas. This local differentiation of material properties enables effective electrical isolation at reduced feature sizes without uniformly increasing isolation complexity throughout the entire device structure.
Solution Approach 2:
The isolation region employs a composite structure combining multiple insulating materials including high-k dielectric material and low-k dielectric material. This composite approach leverages the complementary properties of different materials: high-k materials provide superior electrical isolation in critical areas, while low-k materials contribute to overall structural stability and compatibility. The combination resolves the contradiction by achieving reliable electrical isolation through material composition rather than relying solely on reduced dimensional scaling.
2Area of moving object
If isolation region size is reduced to maintain feature size, then active region density increases, but electrical separation effectiveness decreases
Solution Approach 1:
The patent changes the dielectric constant parameter of the insulating material from conventional low-k materials to high-k materials in the isolation region. This parameter change enables the isolation structure to maintain effective electrical separation even when the physical dimensions of the isolation region are reduced. The high dielectric constant compensates for the reduced size, ensuring that electrical isolation effectiveness is maintained while allowing for higher active region density.
3Reliability
If multiple insulating layers are added to improve isolation, then electrical separation improves, but device complexity increases
Solution Approach 1:
The isolation structure is segmented into distinct functional layers: a first insulating layer comprising high-k dielectric material for primary electrical isolation, and a second insulating layer comprising low-k dielectric material for structural completion and planarization. This segmentation allows each layer to perform its specific function optimally while maintaining a relatively simple overall structure. The clear functional division reduces manufacturing complexity compared to undifferentiated multi-layer approaches.
Solution Approach 2:
The high-k insulating layer serves multiple functions simultaneously: it provides the primary electrical isolation between adjacent active regions, acts as a barrier layer preventing dopant diffusion, and contributes to stress engineering in the semiconductor device. This multi-functionality reduces the need for additional dedicated layers, thereby limiting the increase in device complexity while achieving improved electrical isolation.
Data Source
AI summary
A semiconductor device can include an isolation region that defines a plurality of active regions. The plurality of active regions can include an upper surface having a short axis in a first direction and a long axis in a second direction. The plurality of active regions can be repeatedly disposed along the first direction and along the second direction, and can be spaced apart from each other. The isolation region can include a first insulating layer being in contact with side walls of a short axis pair of active regions which can be the closest active regions in the first direction among the plurality of active regions, and continuously extending along a first shortest distance between the short axis pair of active regions.