Semiconductor Interconnect Layout for Scaled MOSFET Performance
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Solution Overview
Problem
The scaling down of MOSFETs in semiconductor devices leads to deterioration in operational properties, necessitating improved techniques to enhance performance.
Innovation Solution
The semiconductor device design includes specific arrangements of PMOSFET and NMOSFET regions with tailored interconnection lines and metal layers, along with a multi-bridge channel field-effect transistor structure and advanced gate insulating layers to improve electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If MOSFETs are scaled down to meet increasing demand for small pattern sizes, then device integration density is improved, but operational properties deteriorate
Solution Approach 1:
The channel is divided into multiple segments with different semiconductor patterns (first, second, and third semiconductor patterns) stacked sequentially. This segmentation allows each segment to contribute differently to channel conduction, improving overall channel resistance characteristics without requiring further scaling of individual transistors.
Solution Approach 2:
The patent transitions from a two-dimensional planar channel structure to a three-dimensional stacked channel structure. The channel pattern includes semiconductor patterns stacked in the vertical direction, effectively utilizing the third dimension to increase channel conduction paths and improve device performance without increasing footprint area.
2Ease of manufacture
If interconnection lines are arranged with uniform spacing, then manufacturing simplicity is maintained, but parasitic capacitance increases
Solution Approach 1:
Different interconnection lines are assigned different linewidths based on their specific functional requirements. The first, third, and fifth lower interconnection lines have a first linewidth, while the second and fourth have a second linewidth. This local differentiation optimizes parasitic capacitance for each line's specific role while maintaining overall manufacturing feasibility.
Solution Approach 2:
The patent varies the linewidth parameter of interconnection lines to optimize electrical characteristics. By changing the linewidth from a uniform value to differentiated values (first linewidth vs. second linewidth), the design adjusts parasitic capacitance and resistance to minimize energy loss while remaining compatible with standard fabrication processes.
3Device complexity
If all interconnection lines have the same linewidth, then process complexity is reduced, but electrical performance deteriorates
Solution Approach 1:
Different interconnection lines have different linewidths tailored to their specific electrical performance requirements. This local quality differentiation improves overall electrical characteristics without requiring complex multi-step patterning processes, as the different linewidths are achieved through a single photolithography step with appropriately designed mask patterns.
Solution Approach 2:
The linewidth parameter is varied across different interconnection lines to optimize electrical performance. The first, third, and fifth lines have one linewidth while the second and fourth have another, creating parameter differentiation that improves electrical characteristics while maintaining process simplicity through single-step patterning.
Data Source
AI summary
A semiconductor device includes a logic cell on a substrate and a first metal layer on the logic cell. The first metal layer includes first and second power lines that extend in a first direction, and first, second, and third lower interconnection lines, which are respectively disposed on first, second, and third interconnection tracks defined between the first and second power lines that extend in the first direction parallel to each other. The first lower interconnection line includes first and second interconnection lines spaced apart from each other by a first distance, and the third lower interconnection line includes third and fourth interconnection lines spaced apart from each other by a second distance. The first and third interconnection lines have first and second ends, respectively, which face the second and fourth interconnection lines, respectively, and have different curvatures.