Semiconductor Capping Structure for Edge Signal Noise Isolation
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Solution Overview
Problem
In semiconductor devices, signal noise at the edges of active areas significantly affects device operation due to increased density and combined circuitry, particularly in CMOS devices, where existing technologies have not effectively mitigated this issue.
Innovation Solution
A capping structure is formed at the edges of the active area in semiconductor devices, increasing the equivalent oxide thickness and effectively isolating signal noise, comprising a frame structure adjacent to the gate dielectric structure, made of materials like silicon oxide, hafnium oxide, or titanium oxide, with an equivalent oxide thickness greater than the gate dielectric structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the density of semiconductor devices is increased to improve integration, then device functionality and circuit combination are enhanced, but signal noise at the edges of active areas increases and adversely affects device operation
Solution Approach 1:
A capping structure is introduced as an intermediary element positioned at the edges of the active area, between the gate dielectric structure and the external environment. This capping structure acts as a mediator that blocks noise signals from reaching the gate dielectric structure, thereby protecting the device operation while maintaining high integration density
Solution Approach 2:
The invention utilizes the edge regions, which are traditionally noise-prone areas, by placing capping structures specifically at these locations. The capping structures convert the harmful noise effect into a controlled interface where the noise is blocked, transforming the problematic edge region into a protected zone that maintains device functionality
2Object-affected harmful factors
If a capping structure is added at the edges of the active area to reduce signal noise, then noise performance is improved, but device structure complexity increases
Solution Approach 1:
Instead of applying a uniform structure across the entire device, the capping structure is applied locally only at the edges of the active area where noise problems occur. This localized approach provides noise protection precisely where needed without adding complexity to the entire device structure
Solution Approach 2:
The capping structure is designed as a segmented frame structure that follows the perimeter of the active area, dividing the device into protected internal regions and external regions. This segmentation allows noise isolation without requiring a complete structural overhaul of the entire device
Data Source
AI summary
A semiconductor device is provided, which includes a substrate, a shallow trench isolation (STI), a gate dielectric structure, a capping structure and a gate structure. The STI is in the substrate and defines an active area of the substrate. The gate dielectric structure is on the active area. The capping structure is adjacent to the gate dielectric structure and at edges of the active area. The gate structure is on the gate dielectric structure and the capping structure. An equivalent oxide thickness of the capping structure is substantially greater than an equivalent oxide thickness of the gate dielectric structure.