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Layer Dependence and Light Tuning Surface Potential of 2D MoS2 on Various Substrates
Feng Li1,2, Junjie Qi1,2, Minxuan Xu1,2
1State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
The surface potential of chemical vapor deposition (CVD)-grown 2D molybdenum disulfide (MoS2) varies with layer number and substrate. Light illumination further tunes this potential, impacting MoS2-based devices.
Area of Science:
- Materials Science
- Surface Science
- 2D Materials
Background:
- Molybdenum disulfide (MoS2) is a key 2D material with tunable electronic properties.
- Understanding surface potential is crucial for optimizing 2D material-based electronic devices.
Purpose of the Study:
- To investigate the surface potential of CVD-grown 2D MoS2.
- To analyze the influence of layer number, substrate, and light illumination on MoS2 surface potential.
- To explore the relationship between surface potential and device performance.
Main Methods:
- Surface potential measurements using Kelvin Probe Force Microscopy (KPFM).
- Fabrication of MoS2 on various substrates (Ag, graphene, Si/SiO2, Au, Pt).
- Electrical characterization (I-V curves) of MoS2/Pt heterojunctions under varying light intensities.
Main Results:
- Surface potential of MoS2 decreases with increasing layer number (1 to 4+ layers).
- Monolayer MoS2 surface potential is highly substrate-dependent, ranging from 4.55 eV (Ag) to 5.50 eV (Pt).
- Light illumination modulates surface potential, decreasing it on Si/SiO2 and increasing it on Pt.
- Schottky barrier height in MoS2/Pt junctions increases with light intensity.
Conclusions:
- Surface potential of 2D MoS2 is controllable via layer thickness, substrate choice, and light.
- These findings offer insights for designing and improving MoS2 electronic and optoelectronic devices.
- Charge transfer, trapped charges, and photoinduced carriers are key mechanisms influencing surface potential.
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