Semiconductor Interconnect Layout for Dense Lines and Leakage Isolation
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Solution Overview
Problem
The miniaturization of metal lines in semiconductor back-end interconnecting structures is hindered by limitations in patterning techniques, and there is a need for methods to prevent current leakage between adjacent metal lines in high-density patterns.
Innovation Solution
The use of two-dimensional (2d) conductive materials, such as graphene or transition metal dichalcogenides, for the first conductive lines, combined with two-dimensional insulating materials like hexagonal boron nitride, to form isolated interconnecting units, and three-dimensional conductive materials for alternate lines, with additional diffusion barriers and liner portions to enhance adhesion and reduce leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the width of metal lines is reduced to increase pattern density, then the interconnecting structure achieves higher density, but current leakage between adjacent metal lines increases
Solution Approach 1:
The patent divides the interconnecting structure into alternating first and second conductive lines with insulating portions between them. This segmentation creates isolated conductive paths that prevent current leakage while maintaining high pattern density. The insulating portions act as barriers that segment the conductive lines, ensuring electrical isolation even at reduced line widths.
Solution Approach 2:
The patent introduces insulating portions as intermediary elements between adjacent conductive lines. These insulating portions serve as mediators that prevent direct electrical contact between neighboring lines, thereby eliminating current leakage paths while allowing the lines to remain in close proximity for high density interconnection.
2Adaptability or versatility
If two-dimensional conductive materials are used for first conductive lines, then anisotropic conductivity provides directional control, but manufacturing complexity increases due to additional diffusion barriers and liner portions
Solution Approach 1:
The patent applies different materials and structures to different regions: two-dimensional conductive materials with anisotropic conductivity for first conductive lines where directional control is needed, and three-dimensional conductive materials for second conductive lines where isotropic conductivity is sufficient. This local differentiation optimizes electrical performance while managing manufacturing complexity through selective material application.
Solution Approach 2:
The patent employs composite material structures combining two-dimensional and three-dimensional conductive materials, along with diffusion barriers and liner portions. This composite approach leverages the unique properties of each material type: 2D materials provide superior anisotropic conductivity control, while 3D materials offer easier manufacturing and isotropic conductivity, creating a hybrid structure that balances performance and manufacturability.
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 approach enables the formation of high-density interconnecting structures with reduced current leakage by utilizing the anisotropic conductivity of 2d materials and isotropic conductivity of 3d materials, effectively isolating and connecting lines while maintaining electrical integrity.
Implementation Method 1
forming insulating portions which are spaced apart from each other to respectively cover the first conductive portions... each of the first conductive portions is separated from two adjacent ones of the second conductive portions through a respective one of the insulating portions
Implementation Method 2
utilizing the anisotropic conductivity of 2d materials and isotropic conductivity of 3d materials, effectively isolating and connecting lines while maintaining electrical integrity
Implementation Method 3
utilizing the anisotropic conductivity of 2d materials and isotropic conductivity of 3d materials, effectively isolating and connecting lines while maintaining electrical integrity
Implementation Method 4
combined with two-dimensional insulating materials like hexagonal boron nitride, to form isolated interconnecting units, and three-dimensional conductive materials for alternate lines, with additional diffusion barriers and liner portions to enhance adhesion and reduce leakage
Data Source
AI summary
A method for manufacturing an interconnecting structure includes: forming first conductive portions on a base structure, the first conductive portions being spaced apart from each other; after forming the first conductive portions, forming insulating portions which are spaced apart from each other to respectively cover the first conductive portions; and after forming the insulating portions, forming second conductive portions on the base structure such that the second conductive portions are disposed to alternate with the first conductive portions and such that each of the first conductive portions is separated from two adjacent ones of the second conductive portions through a respective one of the insulating portions.