Gate Structure Protection Layers for Plasma Damage Mitigation
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Solution Overview
Problem
The semiconductor industry faces challenges in forming reliable semiconductor device structures as feature sizes continue to decrease, leading to increased complexity and difficulty in fabrication processes.
Innovation Solution
The process involves forming fin structures over a semiconductor substrate, using spacer elements and gate structures with specific materials and layers, and applying protection layers to prevent plasma-induced damage, along with a dielectric layer to enhance device performance and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If feature sizes continue to decrease to increase functional density, then production efficiency improves and costs降低, but fabrication process complexity increases and manufacturing difficulty increases
Solution Approach 1:
The fabrication process is divided into multiple sequential steps including forming first and second protection material layers, selective removal steps, and staged deposition processes. This segmentation allows complex structures to be built systematically through manageable discrete operations, resolving the contradiction between high functional density and fabrication complexity
Solution Approach 2:
Protection material layers are formed in advance before critical plasma processing steps. These preliminary protective structures are deposited and patterned beforehand to prevent damage during subsequent manufacturing operations, enabling smaller feature sizes without proportionally increasing process difficulty
2Reliability
If protection layers are applied to prevent plasma-induced damage, then device reliability improves, but fabrication process complexity increases
Solution Approach 1:
First and second protection material layers serve as intermediary protective structures between the gate structure and the plasma environment. These layers are deposited conformally, patterned selectively, and removed in controlled steps, providing reliable protection against plasma-induced damage while maintaining manageable structural complexity through systematic processing
Solution Approach 2:
The protection material layers are applied selectively to specific regions requiring protection during plasma processing. The first protection material layer covers the gate structure, while the second protection material layer is applied to exposed portions, creating locally optimized protection that enhances reliability without unnecessarily complicating the overall device structure
Data Source
AI summary
Semiconductor device structures and methods for forming the same are provided. A semiconductor device structure includes a gate structure over a semiconductor substrate. The gate structure includes a gate electrode layer and a gate dielectric layer covering a bottom surface and sidewalls of the gate electrode layer. The semiconductor device structure also includes spacer elements in contact with sidewalls of the gate structure and protruding from a top surface of the gate electrode layer. The semiconductor device structure also includes a first protection layer over the gate electrode layer and between the spacer elements. The semiconductor device structure also includes a dielectric layer over the first protection layer and between the spacer elements. A portion of the dielectric layer is between sidewalls of the spacer elements and sidewalls of the first protection layer.