研究目的
Investigating the charge transfer phenomenon and its influence on exciton and trion characteristics in monolayer/bilayer MoS2 lateral interfaces.
研究成果
The study demonstrates that charge transfer across the monolayer/bilayer MoS2 lateral interface significantly influences exciton and trion characteristics, with the neutral exciton emission being enhanced near the interface. DFT calculations revealed that work functions are strongly influenced by the underlying substrate and edge terminations, leading to non-uniform electrical potential distribution at the interface. These findings are useful for characterizing electronic properties in two-dimensional layered nanostructures and for designing new optoelectronic devices.
研究不足
The study is limited by the specific conditions of the CVD-grown MoS2 samples and the theoretical approximations used in DFT calculations. The influence of edge terminations and substrate effects on charge transfer and PL characteristics may vary under different experimental conditions.
1：Experimental Design and Method Selection:
The study involved spatially resolved Raman scattering and photoluminescence (PL) measurements on CVD-grown MoS2 layers with various stacking configurations. Density functional theory (DFT) was used to calculate work functions for different edge terminations of MoS
2：Sample Selection and Data Sources:
MoS2 samples were synthesized using a chemical vapor deposition (CVD) method and transferred to a SiO2 substrate for optical measurements.
3：List of Experimental Equipment and Materials:
Equipment included an Argon-ion laser for excitation, an optical microscope objective for focusing, a thermoelectrically cooled charge-coupled device detector for light collection, and a computer-controlled piezoelectric xy stage for PL and Raman mapping measurements.
4：Experimental Procedures and Operational Workflow:
PL and Raman measurements were performed in a backscattering geometry at room temperature, with spatial resolution better than 1 μm. The excitation laser power was maintained at less than
5：5 mW to avoid laser-induced heating effects. Data Analysis Methods:
The PL spectra were analyzed to decompose the A exciton region into the negatively charged exciton (X?) peak and the neutral exciton (X) peak. DFT calculations were performed to understand the charge transfer characteristics.
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