MOSFET Layout Around Deep Trench Isolation Stress
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Solution Overview
Problem
Deep Trench Isolation (DTI) stress negatively affects the performance of MOSFETs by causing variations in stress patterns that degrade current flow, leading to performance issues in semiconductor devices.
Innovation Solution
The semiconductor device is designed with high precision transistors positioned away from DTI stress regions, allowing for effective utilization of open spaces and minimizing the adverse effects of DTI stress by strategically placing transistors and other elements relative to the DTI structure, thereby maintaining high precision in certain circuits while allowing lower precision elements to be used in less critical applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If Deep Trench Isolation (DTI) is used to isolate semiconductor elements, then element isolation and noise suppression are improved, but MOSFET performance deteriorates due to stress-induced current flow variations
Solution Approach 1:
The patent applies local quality by creating different regions with different precision requirements. High precision transistors are placed in regions away from DTI stress, while lower precision transistors are placed in DTI stress regions. This allows the device to optimize performance where needed while tolerating stress in less critical areas, resolving the contradiction between noise suppression and MOSFET performance.
Solution Approach 2:
The semiconductor device is segmented into different functional regions based on their precision requirements. The device includes high precision transistor regions isolated from DTI stress and lower precision transistor regions that can tolerate DTI stress. This segmentation allows simultaneous optimization of noise suppression in critical areas and overall device integration.
2Reliability
If high precision transistors are placed away from DTI stress regions, then transistor performance is improved, but device area increases due to open space utilization
Solution Approach 1:
Different regions of the device are assigned different precision levels based on their functional requirements. High precision transistors are placed in stress-free regions while lower precision transistors are placed in DTI stress regions, allowing efficient space utilization without compromising critical performance parameters.
Solution Approach 2:
The patent applies partial precision to different transistor regions rather than requiring uniform high precision throughout the device. By allowing lower precision in non-critical areas, the device achieves high performance where needed while minimizing overall area consumption.
3Reliability
If elements are strategically disposed to avoid DTI stress, then electrical characteristics are improved, but manufacturing complexity increases
Solution Approach 1:
The device layout is segmented into distinct high precision and lower precision regions, making the complex disposition requirement more manageable. This segmentation provides a clear framework for manufacturing while achieving the goal of protecting critical transistors from DTI stress.
Data Source
AI summary
A semiconductor device includes a first semiconductor element that is an N-channel type MOSFET, a second semiconductor element that is an N-channel type MOSFET disposed next to the first semiconductor element, and a DTI that surrounds the first semiconductor element and the second semiconductor element, the first semiconductor element is connected to a first circuit and the second semiconductor element is connected to a second circuit different from the first circuit.