Multi-Metal Gate Electrode Structure for Scaled MOSFET Performance
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Solution Overview
Problem
The scaling down of metal-oxide-semiconductor field-effect transistors (MOS-FETs) in semiconductor devices leads to deterioration in operational properties, necessitating improved electric characteristics.
Innovation Solution
A semiconductor device design featuring a gate electrode with a first and second electrode portion, including a first metal pattern, an etch barrier pattern, and a second metal pattern, where the etch barrier pattern is thinner than the first and second metal patterns, and is in contact with both, along with a gate insulating layer and specific semiconductor patterns to enhance electrical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If MOS-FETs are scaled down to meet increasing demand for smaller pattern sizes, then device size is reduced, but operational properties deteriorate
Solution Approach 1:
The gate electrode structure employs different metal patterns (first metal pattern, second metal pattern, third metal pattern) with potentially different materials and properties in different regions. This local differentiation allows optimization of electrical characteristics in specific areas to compensate for scaling effects, improving operational properties while maintaining small device size.
Solution Approach 2:
The gate electrode is constructed as a composite structure comprising multiple metal patterns stacked sequentially (first metal pattern, etch barrier pattern, second metal pattern, third metal pattern). This composite architecture combines the advantages of different materials to achieve both small dimensions and improved operational characteristics that cannot be obtained with single-material electrodes.
2Device complexity
If the etch barrier pattern is made thinner to reduce complexity, then manufacturing is simplified, but contact integrity with metal patterns may be compromised
Solution Approach 1:
The etch barrier pattern thickness is optimized to be thinner than the first and second metal patterns, representing a parameter change that balances manufacturing simplicity with functional requirements. This controlled thinning reduces overall gate electrode complexity while maintaining sufficient contact integrity through proper material selection and thickness control.
3Reliability
If multiple metal patterns are stacked to improve electrical characteristics, then operational properties are enhanced, but device complexity increases
Solution Approach 1:
The gate electrode is segmented into multiple functional metal patterns (first metal pattern, second metal pattern, third metal pattern) stacked in sequence. Each segment serves a specific electrical function, allowing independent optimization of electrical characteristics without requiring complete redesign of the entire electrode structure, thus managing complexity through modular segmentation.
Solution Approach 2:
The stacked metal pattern structure serves multiple functions simultaneously: electrical conduction, etch barrier protection, and operational characteristic optimization. This multi-functionality consolidates several requirements into a single integrated structure, improving electrical characteristics without proportionally increasing overall device complexity.
Data Source
AI summary
A semiconductor device may include a substrate including first and second active regions, which are adjacent to each other, first and second active patterns provided on the first and second active regions, respectively, and a gate electrode extended to cross the first and second active patterns. The gate electrode may include first and second electrode portions provided on the first and second active regions, respectively. The second electrode portion may include a first metal pattern, an etch barrier pattern, a second metal pattern, and a third metal pattern sequentially covering the second active pattern. The first electrode portion may include a second metal pattern covering the first active pattern. The etch barrier pattern may be in contact with the first metal pattern and the second metal pattern, and the etch barrier pattern may be thinner than the first metal pattern and thinner than the second metal pattern.