Semiconductor Device Wiring Structure with Etch-Stop Layer
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Solution Overview
Problem
As semiconductor devices trend towards higher integration and smaller transistor sizes, the increased resistance and capacitance between wirings pose challenges for high-speed operations, making it difficult to maintain performance.
Innovation Solution
A semiconductor device structure is developed that includes an etch-stop layer with improved reliability, a resistive metal pattern, and a specific layer configuration to reduce etching damage and enhance electrical connectivity, featuring a resistive structure with an etch-stop layer, a resistive metal pattern, and insulating barrier layers to manage wiring resistance and capacitance effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the degree of integration is increased to meet high performance demand, then device functionality is improved, but wiring resistance increases causing performance degradation
Solution Approach 1:
The patent introduces a vertically stacked three-dimensional structure with multiple insulating layers, barrier layers, and conductive vias at different heights. This vertical dimensionality allows wiring to be routed through multiple levels rather than confined to a single plane, effectively increasing the cross-sectional area for current flow and reducing resistance while maintaining high integration density.
Solution Approach 2:
The patent divides the wiring structure into multiple segments across different vertical levels (first wiring layer, second wiring layer, third wiring layer separated by intermediate insulating layers). This segmentation allows current to be distributed across multiple parallel paths, reducing the effective resistance and enabling high-speed signal transmission despite increased integration density.
2Productivity
If wiring size is reduced to achieve high integration, then device density is improved, but wiring resistance increases
Solution Approach 1:
The patent compensates for reduced wiring cross-section in the horizontal plane by extending the conductive path into the vertical dimension. Multiple wiring layers stacked vertically provide additional conductive area, effectively increasing the total cross-sectional area available for current flow and offsetting the resistance increase from smaller individual wiring dimensions.
Solution Approach 2:
The patent employs a composite structure combining multiple materials with different electrical properties - conductive materials for wirings, insulating materials with different dielectric constants for isolation layers, and barrier materials. This composite approach allows optimization of each layer's properties to minimize overall resistance while maintaining high integration density.
3Productivity
If distance between wirings is reduced to increase integration, then device density is improved, but capacitance between wirings increases
Solution Approach 1:
The patent introduces intermediate insulating layers with low dielectric constant materials positioned between adjacent wiring layers. These intermediary layers act as electrical isolators that reduce capacitive coupling between closely spaced wirings, minimizing signal interference and allowing higher integration density without sacrificing signal transmission speed.
Solution Approach 2:
The patent applies different dielectric materials with optimized local properties in different regions - using low-k insulating materials specifically in regions where wiring density is highest and capacitive effects are most problematic, while maintaining other functional requirements in different areas of the device structure.
4Manufacturing precision
If etching process is used to form patterns, then manufacturing precision is improved, but etching damage occurs reducing reliability
Solution Approach 1:
The patent introduces sacrificial buffer layers (such as oxide layers or nitride layers) beneath the patterns to be etched. These buffer layers absorb etching damage and prevent direct contact between the etchant and the underlying critical structures, allowing precise pattern formation through etching while protecting against reliability-degrading damage.
Solution Approach 2:
The patent performs preliminary deposition of protective and buffer layers before the etching process. This preliminary action prepares the structure to withstand the etching process by establishing protective barriers and sacrificial layers that will be removed or retained after etching, ensuring both pattern precision and structural integrity.
Data Source
AI summary
A semiconductor device includes a first insulating layer disposed on a substrate, a first wiring disposed in the first insulating layer, a first insulating barrier layer disposed on the first insulating layer, an etch-stop layer disposed on the first insulating barrier layer and having an area smaller than an area of the first insulating barrier layer in a plan view, a resistive metal pattern disposed on the etch-stop layer, a second insulating barrier layer disposed on the resistive metal pattern, a second insulating layer covering the first and second insulating barrier layers, a second wiring disposed in the second insulating layer, and a first conductive via disposed between the resistive metal pattern and the second wiring to penetrate through the second insulating barrier layer and the second insulating layer and electrically connect the resistive metal pattern and the second wiring.