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MBE-grown ultrathin PtTe2 films and their layer-dependent electronic structures
Lei Zhang1,2, Tong Yang3, Arramel2,4
1SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China. wzhuo@szu.edu.cn.
Growth temperature critically impacts 2D platinum ditelluride (PtTe₂) film quality for photodetectors. Optimized growth yields high-quality ultrathin PtTe₂ films with tunable electronic properties, essential for advanced device applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- 2D platinum ditelluride (PtTe₂) exhibits unique electronic properties, making it promising for 2D photodetector applications.
- Film quality is a crucial factor influencing the performance of PtTe₂-based devices.
Purpose of the Study:
- Investigate the influence of growth temperature on PtTe₂ film quality.
- Unveil the layer-dependent electronic properties of PtTe₂.
- Optimize growth conditions for high-quality ultrathin PtTe₂ films.
Main Methods:
- Molecular beam epitaxy (MBE) for film growth.
- X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and scanning tunneling microscopy/spectroscopy (STM/STS) for characterization.
- Density functional theory (DFT) calculations for theoretical analysis.
Main Results:
- Low growth temperatures (≤250 °C) result in monolayer/bilayer PtTe₂ films.
- Optimal growth at ≈300 °C yields large-area continuous bilayer PtTe₂ films.
- High temperatures (>300 °C) lead to poor crystallinity and Te deficiency.
- Monolayer PtTe₂ is a semiconductor (bandgap 0.80 ± 0.05 eV), transitioning to a semimetal from the bilayer.
Conclusions:
- Growth temperature significantly affects PtTe₂ film quality and crystallinity.
- Bilayer PtTe₂ exhibits higher thermal stability.
- Controlled growth conditions enable the fabrication of high-quality ultrathin PtTe₂ films for device applications.
