Semiconductor Gate Diffusion Barrier for Leakage Reduction
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Solution Overview
Problem
The integration of two-dimensional or planar semiconductor devices is limited by expensive process equipment for fine pattern formation, which restricts the increase in integration density and leads to inferior electrical isolation and leakage current issues due to conductive material diffusion between gate electrodes and device isolation patterns.
Innovation Solution
A semiconductor device with a diffusion barrier structure, including an air gap or insulating barrier layers like silicon nitride, aluminum oxide, or aluminum nitride, is implemented between the gate electrodes and insulating spacers to prevent conductive material diffusion, enhancing electrical isolation and reducing leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two-dimensional or planar semiconductor devices are used, then manufacturing process is simpler, but integration density cannot be increased and electrical isolation deteriorates due to conductive material diffusion
Solution Approach 1:
The patent transitions from two-dimensional planar semiconductor devices to three-dimensional vertical semiconductor devices. The gate structures extend vertically from the substrate surface, and the separation trench divides the substrate into multiple regions vertically, enabling higher integration density while maintaining electrical isolation through the diffusion barrier structure in the vertical dimension.
Solution Approach 2:
The patent introduces a diffusion barrier structure as an intermediary layer between the gate electrode and the device isolation pattern. This intermediate layer prevents direct contact and diffusion of conductive materials between these components, thereby improving electrical isolation without requiring complex device restructuring.
2Productivity
If fine pattern forming technology is advanced to increase integration, then integration density improves, but process equipment cost increases significantly
Solution Approach 1:
The patent achieves higher integration density by transitioning to vertical three-dimensional structures rather than relying solely on reducing feature sizes in two dimensions. The vertical gate structures and separation trench configuration enable increased device density without requiring the same level of fine pattern forming capability as planar scaling would demand.
3Productivity
If gate structures are placed closer together to increase integration, then integration density improves, but electrical isolation deteriorates due to conductive material diffusion
Solution Approach 1:
The patent introduces a diffusion barrier structure as an intermediary layer between the gate electrode and the device isolation pattern. This intermediate layer prevents direct contact and diffusion of conductive materials between these components, thereby improving electrical isolation without requiring complex device restructuring.
Solution Approach 2:
The patent applies a specific diffusion barrier material layer locally at the critical interface between the gate electrode and device isolation pattern. This localized application of specialized material provides targeted prevention of conductive material diffusion exactly where needed, maintaining electrical isolation while allowing gate structures to be positioned closer together for higher integration density.
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 diffusion barrier structure effectively prevents conductive material diffusion, improving the insulating properties and reducing leakage currents between gate electrodes and strapping plugs, thereby enhancing the reliability and performance of vertical-type semiconductor devices.
Implementation Method 1
a diffusion barrier structure between the gate electrode and the insulating spacer
Implementation Method 2
The diffusion barrier structure may include an air gap between the gate electrode and the insulating spacer
Implementation Method 3
The diffusion barrier structure may include a metal nitride layer
Data Source
AI summary
Provided is a semiconductor device, including gate structures on a substrate, the gate structures extending parallel to a first direction and being spaced apart from each other by a separation trench interposed therebetween, each of the gate structures including insulating patterns stacked on the substrate and a gate electrode interposed therebetween; vertical pillars connected to the substrate through the gate structures; an insulating spacer in the separation trench covering a sidewall of each of the gate structures; and a diffusion barrier structure between the gate electrode and the insulating spacer.