Epitaxy of wafer-scale single-crystal MoS2 monolayer via buffer layer control
Lu Li1,2, Qinqin Wang1,2, Fanfan Wu1,2
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China.
Nature Communications
|February 28, 2024
Summary
Researchers achieved wafer-scale single-crystal molybdenum disulfide (MoS2) monolayers on sapphire. This breakthrough enables advanced 2D electronics and extends Moore's Law for transistors.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Monolayer molybdenum disulfide (MoS2) is a promising 2D semiconductor for next-generation electronics.
- Controlled synthesis of wafer-scale MoS2 single crystals on commercial substrates is a significant challenge.
Purpose of the Study:
- To demonstrate the epitaxial growth of 2-inch single-crystal MoS2 monolayers on c-plane sapphire.
- To develop a strategy for producing wafer-scale 2D semiconductors on commercial substrates.
Main Methods:
- Engineered interfacial reconstructed layer via S/MoO3 precursor ratio control.
- Utilized cross-dimensional characterizations from atomic to centimeter scale.
- Grew 2-inch single-crystal MoS2 monolayers on c-plane sapphire substrates.
Main Results:
- Achieved wafer-scale uniformity and state-of-the-art quality of epitaxial monolayer MoS2.
- Demonstrated ~100% phonon circular dichroism and ~70% exciton valley polarization.
- Obtained room-temperature mobility of ~140 cm2v-1s-1 and an on/off ratio of ~10^9.
Conclusions:
- Developed a simple strategy for wafer-scale single-crystal 2D semiconductors on commercial insulators.
- Paved the way for extending Moore's Law and industrial applications of 2D electronic circuits.
