Vertical Oxide Transistor With Carbon Contact Layer for Low Resistance
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Solution Overview
Problem
Existing vertical transistors with oxide semiconductor channels face challenges in achieving improved electrical characteristics and thermal reliability due to contact resistance and potential for material diffusion, which affects the integration and stability of the devices.
Innovation Solution
A vertical transistor design incorporating a conductive carbon thin film, such as graphene or carbon nanotubes, between the metal electrode and the oxide semiconductor layer, along with a gate-all-around structure and specific manufacturing methods like Plasma Enhanced Atomic Layer Deposition, to enhance contact characteristics and reduce diffusion, thereby improving electrical performance and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal electrode is directly contacted with the oxide semiconductor layer, then the device structure is simple, but contact resistance is high and electrical characteristics are poor
Solution Approach 1:
A conductive carbon thin film is introduced as an intermediary layer between the lower metal electrode and the oxide semiconductor layer. This carbon film serves as a mediator that improves contact characteristics and reduces contact resistance, thereby enhancing electrical characteristics without significantly complicating the overall device structure.
Solution Approach 2:
The patent employs a composite structure combining metal electrode, conductive carbon film, and oxide semiconductor layer. This multi-material composition leverages the advantages of each material: the metal provides structural support and conductivity, the carbon film improves contact characteristics, and the oxide semiconductor provides the active channel, collectively achieving superior electrical performance.
2Manufacturing precision
If high-temperature processing is used to improve material quality, then material properties are enhanced, but thermal diffusion of materials occurs reducing device stability
Solution Approach 1:
The conductive carbon thin film acts as a diffusion barrier between the metal electrode and the oxide semiconductor layer. This intermediary carbon layer prevents thermal diffusion and material contamination during high-temperature processing, enabling the use of elevated temperatures to enhance material quality without compromising device stability.
Solution Approach 2:
The carbon film creates a chemically inert interface between the metal electrode and oxide semiconductor layer, protecting against unwanted chemical reactions and material diffusion during high-temperature processing. This inert barrier allows for improved material quality through thermal processing while maintaining compositional stability.
3Ease of manufacture
If the gate electrode is positioned away from the oxide semiconductor layer, then manufacturing is simplified, but gate control over the channel is reduced
Solution Approach 1:
The gate electrode structure transitions from a planar configuration to a three-dimensional configuration where the gate electrode wraps around and entirely surrounds the oxide semiconductor layer. This dimensional change enables the gate to be positioned at an appropriate distance for easy manufacturing while maintaining strong electrostatic control through the surrounding geometry.
Solution Approach 2:
The gate electrode is configured to entirely surround the oxide semiconductor layer, creating a nested structure where the gate encompasses the channel region. This nesting arrangement provides effective gate control while allowing for simplified manufacturing processes.
4Adaptability or versatility
If material layers are stacked with intervening layers for separation, then manufacturing flexibility is improved, but contact characteristics between electrode and semiconductor are degraded
Solution Approach 1:
The conductive carbon thin film serves as an optimal intermediary that improves contact characteristics between the metal electrode and oxide semiconductor layer. Rather than using thick intervening layers for separation, this thin carbon film provides the necessary interface optimization while maintaining excellent electrical contact, thereby achieving both good contact characteristics and manufacturing flexibility.
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 proposed design significantly reduces contact resistance, enhances integration density, and improves thermal reliability by preventing material diffusion, leading to improved electrical characteristics and stability of the vertical transistor.
Implementation Method 1
A vertical transistor design incorporating a conductive carbon thin film, such as graphene or carbon nanotubes, between the metal electrode and the oxide semiconductor layer... to enhance contact characteristics and reduce diffusion, thereby improving electrical performance
Implementation Method 2
a gate insulating layer between the oxide semiconductor layer and the gate electrode... improves thermal reliability by preventing material diffusion
Implementation Method 3
specific manufacturing methods like Plasma Enhanced Atomic Layer Deposition
Data Source
AI summary
Provided are a vertical transistor and a method of manufacturing the same. The vertical transistor includes a substrate, a lower electrode on the substrate and including a metal material, a carbon thin film being conductive and on the lower electrode, an oxide semiconductor layer on the carbon thin film, a gate electrode apart from the oxide semiconductor layer, a gate insulating layer arranged between the oxide semiconductor layer and the gate electrode, and an upper electrode on the oxide semiconductor layer, wherein the lower electrode. The carbon thin film, the oxide semiconductor layer, and the upper electrode are arranged in a direction perpendicular to the substrate.