Semiconductor ESD Protection Structure With Localized Field Region
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Solution Overview
Problem
Existing semiconductor structures face challenges in effectively protecting against electrostatic discharge (ESD) damage, particularly in maintaining voltage endurance and preventing punch-through between source and drain regions.
Innovation Solution
A semiconductor structure with a specific configuration including a substrate, well, heavily doped regions, gate structure, field region, and field oxide, where the field region is not formed under the second heavily doped region, enhancing voltage endurance and incorporating shallow trench isolation to prevent punch-through.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a field region is formed under the first heavily doped region and gate structure, then voltage endurance is improved, but device complexity increases
Solution Approach 1:
The field region is selectively formed only under the first heavily doped region and gate structure, not under the second heavily doped region. This localized approach provides voltage endurance protection where needed while avoiding unnecessary complexity and performance degradation in other areas.
2Reliability
If ESD protection devices are added to semiconductor structures, then protection against electrostatic discharge is improved, but device complexity increases
Solution Approach 1:
The ESD protection device is integrated into the existing semiconductor structure using shared components such as the well, heavily doped regions, and gate structure. This multi-functional design provides ESD protection while maintaining compatibility with the underlying device architecture, avoiding significant complexity increases.
3Reliability
If shallow trench isolation structure is formed adjacent to the first heavily doped region, then punch-through prevention is improved, but manufacturing complexity increases
Solution Approach 1:
The shallow trench isolation structure is formed adjacent to the first heavily doped region to create a physical barrier that prevents punch-through before it can occur. This preliminary protective structure is integrated into the fabrication process, preventing reliability issues rather than correcting them later.
Data Source
AI summary
A semiconductor structure comprising an improved ESD protection device is provided. The semiconductor structure comprises a substrate, a well formed in the substrate, a first heavily doped region formed in the well, a second heavily doped region formed in the well and separated apart from the first heavily doped region, a gate structure formed on the substrate between the first heavily doped region and the second heavily doped region, a field region formed in the well under the first heavily doped region and the gate structure, and a field oxide/shallow trench isolation structure formed adjacent to the first heavily doped region. The field region is not formed under the second heavily doped region. The well and the field region have a first type of doping. The first heavily doped region and the second heavily doped region have a second type of doping.