Semiconductor Interconnects with Dielectric Barrier and Etch Stop
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Solution Overview
Problem
The reduction in critical dimension of semiconductor devices leads to increased electrical resistance and capacitive coupling of interconnection lines, making it difficult to achieve high-speed semiconductor devices.
Innovation Solution
The semiconductor device design includes first metal lines with a dielectric barrier layer, an etch stop layer, and low-k dielectric patterns, along with a conductive via that penetrates through the layers to reduce electrical resistance and capacitive coupling, while maintaining a high aspect ratio to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the critical dimension of semiconductor devices is reduced to increase integration, then device density is improved, but electrical resistance and capacitive coupling of interconnection lines increase
Solution Approach 1:
The patent applies local quality by creating different dielectric structures in different regions: low-k dielectric patterns are formed between metal lines to reduce capacitive coupling, while buffer patterns are placed at specific locations to control electrical resistance. This localized optimization allows the device to achieve high density while maintaining electrical performance in critical areas.
Solution Approach 2:
The patent uses composite materials by combining multiple dielectric materials with different properties - low-k dielectric material for reducing capacitive coupling between adjacent metal lines, and buffer material for managing electrical resistance. This composite approach allows simultaneous optimization of different electrical parameters that would be conflicting in a single-material system.
2Reliability
If multiple layers of dielectric materials are added to reduce resistance and coupling, then electrical performance is improved, but device complexity increases
Solution Approach 1:
The patent segments the dielectric structure into distinct functional components: low-k dielectric patterns between metal lines for coupling control, buffer patterns for resistance management, and etch stop layers for process control. This segmentation allows each layer to be optimized independently for its specific function, improving electrical performance without requiring a monolithic complex structure.
Solution Approach 2:
The etch stop layer acts as an intermediary element that simplifies the fabrication process. It provides a reference plane for etching operations and protects underlying layers, making the multi-layer dielectric structure easier to manufacture. This intermediary layer reduces process complexity despite adding structural layers.
Data Source
AI summary
A semiconductor device is provided. The semiconductor device includes first metal lines on a lower layer, a dielectric barrier layer provided on the lower layer to cover side and top surfaces of the first metal lines, an etch stop layer provided on the dielectric barrier layer to define gap regions between the first metal lines, an upper insulating layer on the etch stop layer, and a conductive via penetrating the upper insulating layer, the etch stop layer, and the dielectric barrier layer to contact a top surface of a first metal line. The etch stop layer includes first portions on the first metal lines and second portions between the first metal lines. The second portions of the etch stop layer are higher than the first portions.