Fin Channel Oxynitride Barrier for Diffusion-Controlled Transistors
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Solution Overview
Problem
As semiconductor devices undergo miniaturization, challenges arise in maintaining the integration density and performance of transistors due to issues with diffusion of elements, dopants, and impurities, which affect the composition and crystal structure of channel regions, leading to reliability and yield concerns.
Innovation Solution
The formation of one or more diffusion barrier layers, specifically nitrogen-containing layers, is implemented during the fabrication of nanostructure devices to inhibit the diffusion of elements and impurities, thereby protecting the channel regions and improving the control over their composition and crystal structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If minimum feature size is reduced to improve integration density, then more components can be integrated into a given area, but diffusion of elements, dopants, and impurities worsens, affecting channel region composition and crystal structure
Solution Approach 1:
A diffusion barrier layer is introduced as an intermediary between the channel region and surrounding structures. This barrier layer selectively prevents the diffusion of elements, dopants, and impurities into the channel region while allowing the miniaturized device structure to function. The barrier layer acts as a mediator that protects the channel region from harmful diffusion effects despite the reduced feature sizes and increased integration density.
Solution Approach 2:
The device structure is segmented into distinct functional layers, with the diffusion barrier layer separated from both the channel region and the source/drain regions. This segmentation allows each layer to perform its specific function independently - the channel region maintains its electrical properties, the barrier layer prevents diffusion, and the source/drain regions provide electrical contact, thereby resolving the contradiction between miniaturization and diffusion control.
2Productivity
If minimum feature size is reduced to improve integration density, then manufacturing capacity increases, but manufacturing precision deteriorates due to difficulty in controlling diffusion at smaller scales
Solution Approach 1:
The diffusion barrier layer serves as a protective intermediary that decouples the manufacturing process from the final device quality. By placing this barrier between the processing environment and the channel region, the system allows for higher integration density through miniaturization while maintaining manufacturing precision, as the barrier prevents process-induced diffusion from degrading the channel region composition.
3Reliability
If diffusion barrier layers are added to prevent element diffusion, then channel region integrity is improved, but device complexity increases
Solution Approach 1:
Rather than implementing complex diffusion prevention measures throughout the entire device structure, the diffusion barrier layer is applied locally only where needed - specifically at the interface between the channel region and areas prone to diffusion. This localized approach maintains channel region integrity while minimizing the overall complexity of the fabrication process, as only specific regions require the additional barrier layer.
4Reliability
If diffusion barrier layers are added to protect channel regions, then transistor yield is improved, but manufacturing cost increases
Solution Approach 1:
The diffusion barrier layer is implemented locally only at critical interfaces where diffusion would most severely impact transistor performance and yield. This targeted approach improves transistor yield by protecting the channel region from diffusion damage while avoiding the need to apply complex, costly barrier structures throughout the entire device, thereby controlling manufacturing costs.
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 enhances the yield and performance of transistors by maintaining the integrity of channel regions, preventing unwanted diffusion and improving the reliability of semiconductor devices.
Implementation Method 1
The formation of one or more diffusion barrier layers, specifically nitrogen-containing layers, is implemented during the fabrication of nanostructure devices to inhibit the diffusion of elements and impurities
Data Source
AI summary
In an embodiment, a method of forming a semiconductor device includes: forming a first oxide layer over a semiconductor fin structure; performing a first nitridation process to convert the first oxide layer to an oxynitride layer; depositing a silicon-containing layer over the oxynitride layer; performing a first anneal on the silicon-containing layer, wherein after performing the first anneal, the oxynitride layer has a higher nitrogen atomic concentration at an interface with the semiconductor fin structure than in a bulk region of the oxynitride layer; and forming a dummy gate structure over the silicon-containing layer.