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Light-Induced Surface Potential Modification in MoS2 Monolayers on Au Nanostripe Arrays
Soyeong Kwon1, Min Hee Kwon1, Jungeun Song1
1Department of Physics, Ewha Womans University, Seoul, 03760, Korea.
Scientific Reports
|October 10, 2019
Summary
Researchers studied the surface potential of molybdenum disulfide (MoS2) monolayers on gold nanostripes. Strain and light illumination significantly altered the surface potential, impacting MoS2-metal contacts and optoelectronics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Molybdenum disulfide (MoS2) is a promising 2D material for electronics.
- Understanding MoS2-metal contacts is crucial for device performance.
- Surface potential variations influence electronic properties.
Purpose of the Study:
- Investigate the surface potential of MoS2 monolayers on gold nanostripes.
- Analyze the effects of strain and light on MoS2 surface potential.
- Elucidate the mechanisms behind MoS2-metal interface electronic interactions.
Main Methods:
- Utilized Kelvin probe force microscopy (KPFM) to measure surface potential.
- Fabricated MoS2 monolayers on Au nanostripe arrays (500 nm period).
- Analyzed surface morphology for strain effects.
Main Results:
- Suspended MoS2 regions experienced tensile strain.
- In the dark, surface potential on gold (Vs-Au) exceeded suspended regions (Vs-S).
- Under green light, Vs-Au became lower than Vs-S, indicating illumination-induced modulation.
Conclusions:
- Strain and electronic interactions at the MoS2/Au interface dictate surface potential.
- Results provide insights into MoS2-metal contact behavior.
- Findings can guide the optimization of MoS2-based optoelectronic devices.
