Air and High-k Spacer Layout for Dense Low Cross-Talk Transistors
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Solution Overview
Problem
The semiconductor industry faces challenges in increasing transistor density while preventing leakage and cross-talk between transistors, as existing isolation structures are not effective enough to maintain performance and reliability at reduced spacings.
Innovation Solution
The use of air spacer structures within transistors and high-k dielectric spacer structures between transistors reduces capacitance and allows for closer transistor placement, utilizing air spacer structures to mitigate capacitance within transistors and high-k dielectric spacer structures to provide effective isolation between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If transistors are arranged closer to increase device density, then more components can be integrated into a given area, but leakage and cross-talk between transistors increases
Solution Approach 1:
The patent applies different dielectric materials with different properties to different locations: low-k dielectric material (k<7) is used in regions where capacitance reduction is critical (within transistor structures and between closely spaced transistors), while standard dielectric material is used in other regions. This local differentiation of material properties enables closer transistor spacing while maintaining isolation performance.
Solution Approach 2:
The patent employs composite dielectric structures combining multiple materials with different dielectric constants. Specifically, it uses a combination of low-k dielectric material (k<7) and standard dielectric material in a layered and spatially distributed configuration. This composite approach allows the structure to simultaneously achieve capacitance reduction for isolation and maintain electrical performance, enabling higher device density without excessive leakage or cross-talk.
2Reliability
If isolation structures are made more effective to prevent leakage and cross-talk, then transistor performance and reliability improve, but the spacing between transistors must be increased, reducing device density
Solution Approach 1:
The patent selectively places low-k dielectric material (k<7) in specific locations where capacitance management is most critical: within transistor structures and between closely spaced transistors. This localized application of low-k material provides enhanced isolation exactly where needed, allowing transistors to be placed closer together without sacrificing leakage or cross-talk prevention.
Solution Approach 2:
The patent uses a composite dielectric architecture combining low-k dielectric material (k<7) and standard dielectric material in specific spatial configurations. The low-k material is strategically positioned to provide capacitance reduction and isolation where transistor spacing is minimized, while standard dielectric material is used in other regions. This composite structure enables effective leakage and cross-talk prevention at reduced transistor pitch, thereby maintaining high device density.
3Quantity of substance
If minimum feature sizes are reduced to increase integration density, then more components fit in a given area, but manufacturing precision and isolation effectiveness become more challenging
Solution Approach 1:
The patent changes the dielectric constant parameter of the isolation material by using low-k dielectric material (k<7) instead of standard dielectric material. This parameter change reduces the capacitance of isolation structures, enhancing their effectiveness at smaller feature sizes. The lower dielectric constant allows the isolation structures to maintain performance even as dimensions are scaled down, enabling continued increases in integration density despite manufacturing challenges.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration increases transistor density while maintaining or improving performance by reducing capacitance and preventing leakage, allowing for faster operation and higher device reliability.
Implementation Method 1
The air spacer structures may reduce capacitance within each transistor
Implementation Method 2
the high-k dielectric spacer structures may reduce spacing between the transistor devices while preventing cross-talk and leakage
Data Source
AI summary
In some embodiments, the present disclosure relates to an integrated chip including a first transistor and a second transistor arranged over a substrate. The first transistor includes first and second source/drain regions over the substrate and includes a first channel structure directly between the first and second source/drain regions. A first gate electrode is arranged over the first channel structure and is between first and second air spacer structures. The second transistor includes third and fourth source/drain regions over the substrate and includes a second channel structure directly between the third and fourth source/drain regions. A second gate electrode is arranged over the second channel structure and is between third and fourth air spacer structures. The integrated chip further includes a high-k dielectric spacer structure over a low-k dielectric fin structure between the first and second channel structures to separate the first and second gate electrodes.