Vertical Transistor Hydrogen Barrier for Memory Reliability
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Solution Overview
Problem
Conventional memory device fabrication processes involving hydrogen annealing lead to undesirable hydrogen diffusion into the channel region of semiconductor devices, degrading performance and reliability.
Innovation Solution
Incorporating electrically insulative materials like aluminum oxide (Al2O3) and conductive barrier materials in the semiconductor device structure to inhibit hydrogen permeation, with a vertical transistor design featuring a semiconductive pillar and gate dielectric material, and using conductive materials to prevent hydrogen diffusion during the annealing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogen annealing process is performed to improve device fabrication, then device features are annealed at low temperatures, but hydrogen diffuses into the channel region degrading performance and reliability
Solution Approach 1:
A barrier layer comprising aluminum oxide (Al2O3) is introduced as an intermediary material between the channel region and the hydrogen annealing environment. This barrier layer has low hydrogen permeability and acts as a mediator that allows the beneficial low-temperature annealing to proceed while blocking the harmful hydrogen diffusion into the channel region, thus resolving the contradiction between achieving device annealing and preventing hydrogen contamination.
Solution Approach 2:
The device structure employs a composite material approach by combining the semiconductor channel region with an aluminum oxide barrier layer. This composite structure leverages the unique properties of aluminum oxide - its electrical insulator characteristics and its low hydrogen permeability - to create a layered composite that enables thermal processing while protecting the channel from hydrogen ingress, thereby improving reliability without suffering from hydrogen diffusion damage.
2Ease of manufacture
If conventional memory cell structures are used, then fabrication is straightforward, but hydrogen permeation degrades channel region performance
Solution Approach 1:
The memory cell structure is segmented into distinct functional layers, with the aluminum oxide barrier layer specifically positioned to protect the channel region. This segmentation allows the barrier function to be independently optimized and integrated into the existing fabrication flow, maintaining ease of manufacture while dramatically improving channel region performance by preventing hydrogen permeation.
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 solution effectively reduces hydrogen diffusion, enhancing the reliability and performance of semiconductor devices by encapsulating the channel region with insulative and conductive barrier materials, thereby protecting it from hydrogen species during the annealing process.
Implementation Method 1
the source region and the drain region each individually comprise at least one electrically conductive material configured to inhibit hydrogen permeation therethrough
Data Source
AI summary
A device comprises a vertical transistor. The vertical transistor comprises a pillar structure, at least one gate electrode, and a dielectric material. The pillar structure comprises a source region, a drain region, and a channel region. The source region and the drain region each individually comprise at least one electrically conductive material configured to inhibit hydrogen permeation therethrough. The channel region comprises a semiconductive material vertically between the source region and the drain region. The at least one gate electrode laterally neighbors the channel region of the semiconductive structure. The dielectric material is laterally between the semiconductive structure and the at least one gate electrode. Additional devices, and related electronic systems and methods are also disclosed.