Semiconductor Gate Structure Insulation Design
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Solution Overview
Problem
Semiconductor devices face challenges in achieving high reliability and multifunctionality due to increasing complexity and integration demands, requiring innovative structural designs to enhance performance and efficiency.
Innovation Solution
A semiconductor device design featuring a specific arrangement of device isolation layers and gate structures, including a first device isolation layer defining active regions, second device isolation layers forming active patterns, and a gate structure extending between these regions, with the gate structure's bottom surface contacting the top surface of the first device isolation layer, allowing for improved insulation and increased gate electrode volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gate structure is positioned higher than the active pattern top surface, then electrical insulation between gate and active regions is improved, but manufacturing precision becomes more difficult to control
Solution Approach 1:
The patent introduces an intermediary insulating layer between the gate structure and the active pattern. This intermediate layer acts as a buffer that ensures electrical insulation while reducing the sensitivity of the gate structure positioning to manufacturing variations. The insulating layer compensates for positioning tolerances, allowing the gate structure to be manufactured with standard precision while still achieving reliable electrical isolation.
Solution Approach 2:
The patent applies beforehand cushioning by pre-establishing the insulating layer before final gate structure assembly. This insulating layer serves as a protective buffer that anticipates and compensates for potential manufacturing variations in gate positioning. By having this cushioning layer in place beforehand, the design tolerates a wider range of gate position variations without compromising electrical insulation reliability.
2Reliability
If device isolation layers are used to separate active regions, then electrical insulation between regions is improved, but device complexity increases
Solution Approach 1:
The patent makes the insulating layer multi-functional by having it serve both as an electrical isolation medium and as a structural reference plane. The same insulating layer that provides electrical insulation between the gate and active regions also serves as a baseline for positioning other device components. This universality reduces the need for additional separate isolation structures, thereby simplifying the overall device architecture while maintaining reliable electrical insulation.
Data Source
AI summary
A semiconductor device includes a first device isolation layer defining active regions spaced apart from each other along a first direction on a substrate, second device isolation layers defining a plurality of active patterns protruding from the substrate, the second device isolation layers extending in the first direction to be spaced apart from each other in a second direction and connected to the first device isolation layer, a gate structure extending in the second direction on the first device isolation layer between the active regions, a top surface of the second device isolation layer being lower than a top surface of the active pattern, a top surface of the first device isolation layer being higher than the top surface of the active pattern, and at least part of a bottom surface of the gate structure being higher than the top surface of the active pattern.