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Uniform High-k Amorphous Native Oxide Synthesized by Oxygen Plasma for Top-Gated Transistors
Teng Tu1, Yichi Zhang1, Tianran Li1
1Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Nano Letters
|September 4, 2020
Summary
Researchers developed a simple method to create a high-k native oxide on 2D Bi2O2Se for advanced electronics. This integration preserves semiconductor properties and enables low-power device fabrication.
Area of Science:
- Materials Science
- Nanotechnology
- Semiconductor Physics
Background:
- High-performance electronics require integrating high-k gate dielectrics with 2D semiconducting materials.
- Achieving uniform, sub-1 nm equivalent oxide thickness (EOT) high-k dielectrics on 2D semiconductors with high interface quality remains a significant challenge.
Purpose of the Study:
- To develop a facile method for synthesizing a uniform high-k native oxide on 2D Bi2O2Se.
- To enable the direct use of this native oxide as gate dielectrics with excellent properties.
- To demonstrate the potential for fabricating discrete electronic components using area-selective oxidation.
Main Methods:
- Utilized oxygen (O2) plasma at room temperature for the synthesis of the high-k amorphous native oxide Bi2SeO5 on 2D Bi2O2Se.
- Characterized the native oxide's dielectric constant (εr ∼ 22) and equivalent oxide thickness (EOT ∼ 0.9 nm).
- Performed high-resolution area-selective oxidation to create discrete electronic components.
Main Results:
- Successfully synthesized a uniform high-k (εr ∼ 22) amorphous native oxide Bi2SeO5 on 2D Bi2O2Se.
- Achieved a conformal native oxide with an EOT of ∼0.9 nm, preserving the underlying 2D semiconductor's properties.
- Demonstrated high-resolution area-selective oxidation for fabricating discrete electronic components.
Conclusions:
- The developed facile approach enables the integration of high-mobility 2D semiconductors with their high-k native oxides.
- This method offers a promising pathway for the development of next-generation nanoelectronics.
- The ability to form high-quality, low-EOT dielectrics directly on 2D materials is crucial for future low-power electronic devices.
