Porous Vanadium Oxide Dielectric Layers for Lower Parasitic Capacitance
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Solution Overview
Problem
Challenges arise during the scaling-down process of semiconductor devices in achieving improved quality, yield, performance, and reliability while reducing complexity, particularly due to issues with parasitic capacitance and process window limitations.
Innovation Solution
Incorporating porous dielectric layers made of vanadium oxide in the semiconductor device design, which reduce parasitic capacitance between adjacent conductive structures and serve as protective layers for bottom inter-feature dielectric layers, improving the process window and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dielectric layers are used in semiconductor device scaling, then manufacturing process is simpler, but parasitic capacitance increases and performance deteriorates
Solution Approach 1:
The patent employs porous dielectric layers with controlled porosity (30-70%) to reduce the dielectric constant and parasitic capacitance between conductive structures. The porous structure is achieved through deposition of precursor materials followed by thermal processing to create void spaces, thereby improving device performance while managing the increased structural complexity through systematic material engineering
Solution Approach 2:
The patent uses composite dielectric structures combining organic-inorganic hybrid materials with porous architectures. These composite materials provide tailored dielectric properties with lower capacitance while maintaining mechanical integrity and processability, resolving the contradiction between performance improvement and manufacturing simplicity
2Reliability
If dielectric constant is reduced to lower parasitic capacitance, then device performance improves, but process window and manufacturing yield decrease
Solution Approach 1:
The patent systematically varies deposition parameters (temperature, pressure, precursor ratios) and thermal processing conditions to optimize the dielectric constant and porosity of the dielectric layers. By controlling these parameters, the patent achieves reduced parasitic capacitance while maintaining a robust process window that ensures manufacturing yield through repeatable process conditions
Solution Approach 2:
The patent performs preliminary conformal deposition of dielectric materials with controlled porosity before final device assembly. This preliminary structuring allows optimization of dielectric properties independent of subsequent processing steps, thereby improving process window and yield while achieving the desired low parasitic capacitance
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
The use of vanadium oxide-based porous dielectric layers enhances semiconductor device performance by reducing parasitic capacitance and improving fabrication yield.
Implementation Method 1
the low dielectric constant of the plurality of outer liner layers and the plurality of bottom inter-feature dielectric layers may reduce the parasitic capacitance between adjacent first conductive structures or between adjacent second conductive structures
Data Source
AI summary
The present application discloses a semiconductor device and a method for fabricating the semiconductor device. The semiconductor device includes a substrate; a plurality of first conductive structures positioned on the substrate; a plurality of outer liner layer each positioned on a corresponding sidewall of the plurality of first conductive structures; and a plurality of bottom inter-feature dielectric layers positioned on the plurality of outer liner layers and between the plurality of first conductive structures. Each of the outer liner layers includes one or more species of vanadium oxide. The plurality of bottom inter-feature dielectric layers are porous.