Asymmetric Contact Segment Layout for CMOS Transistor Capacitance
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Solution Overview
Problem
Existing semiconductor technologies face challenges in optimizing the performance of both n-type and p-type transistors within a semiconductor device, particularly in terms of capacitance and preventing short circuits, which affect the overall yield and efficiency of the device.
Innovation Solution
The implementation of contact lines with varying widths and heights for n-type and p-type transistors, specifically adjusting the widths of contact segments to optimize performance and reduce capacitance, while ensuring proper alignment and contact with source/drain regions, and using different materials and deposition techniques for the contact lines and gate structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact lines with varying widths and heights are implemented for n-type and p-type transistors, then capacitance is reduced and performance is optimized, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies local quality by implementing different contact line dimensions (width and height) specifically for n-type versus p-type transistors. The contact lines are locally optimized: wider and/or taller for n-type transistors to reduce their higher capacitance, and narrower for p-type transistors. This localized differentiation resolves the contradiction by tailoring contact line properties to the specific electrical characteristics of each transistor type, improving overall device performance while managing complexity through targeted rather than universal modifications.
2Reliability
If contact line widths are adjusted to optimize performance, then capacitance is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs parameter changes by systematically varying the width and height dimensions of contact lines based on transistor type. Specific dimensional parameters are adjusted: n-type contact lines receive increased width and/or height parameters to reduce capacitance, while p-type contact lines use smaller parameters. This controlled parameter differentiation achieves capacitance optimization while establishing clear manufacturing specifications that, although precise, are systematically defined and controllable through standard semiconductor fabrication processes.
3Reliability
If different materials and deposition techniques are used for contact lines and gate structures, then transistor performance is optimized, but ease of manufacture decreases
Solution Approach 1:
The patent applies composite materials by utilizing different material compositions for contact lines versus gate structures, and potentially different materials for n-type versus p-type contact lines. This material differentiation optimizes electrical performance: conductive materials with appropriate work functions and conductivity are selected for contact lines to minimize resistance and capacitance, while separate optimized materials are used for gate structures. The composite material approach resolves the contradiction by achieving superior transistor functionality through material optimization, with the added benefit that modern semiconductor fabrication capabilities can handle multiple material depositions in sequence.
Data Source
AI summary
A semiconductor device includes an n-type transistor, a first contact segment, a p-type transistor and a second contact segment. Each of the n-type transistor and the p-type transistor includes a first source/drain region and a second source/drain region. The first contact segment partially overlaps the first source/drain region of the n-type transistor, and is in contact with the first source/drain region of the n-type transistor. The second contact segment partially overlaps the first source/drain region of the p-type transistor, and is in contact with the first source/drain region of the p-type transistor. A width of a portion of the first contact segment that overlaps the first source/drain region of the n-type transistor is different from a width of a portion of the second contact segment that overlaps the first source/drain region of the p-type transistor.