Journal
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
Volume 15, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.202100385
Keywords
Au-assisted mechanical exfoliation; interfacial charge transfer; large-area single-crystalline monolayer MoS2; 1L MoS2-Au hybrid system; spectroscopic ellipsometry
Funding
- Key-Area Research and Development Program of Guangdong Province [2020B010169002]
- Natural Science Foundation of Guangdong Province [2020A1515010885]
- Shenzhen Science and Technology Innovation Programs [JCYJ20190806142614541, GXWD20201230155427003-20200801190929005]
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The recent Au-assisted mechanical exfoliation technique has enabled scalable fabrication of high-quality monolayer 2D crystals, particularly MoS2. By utilizing spectroscopic ellipsometry, researchers have characterized the dielectric function of single-crystal monolayer MoS2 and found that the disappearance of exciton peaks in the dielectric function spectrum in the 1L MoS2-Au hybrid system is attributed to charge transfer at the 1L MoS2-Au interface. This observation is further supported by various measurements such as Raman, photoluminescence, and differential reflectance, revealing the impact of the Au substrate on the dielectric response of 2D monolayers.
The recent Au-assisted mechanical exfoliation technique has enabled scalable fabrication of millimeter-sized, high-quality monolayer 2D crystals. Herein, spectroscopic ellipsometry characterization of as-exfoliated single-crystalline monolayer MoS2 is reported. By developing layer-by-layer ellipsometry measurements and analysis, the complex dielectric function of monolayer MoS2 is extracted. Compared with bulk MoS2, the A and B exciton peaks in the dielectric function spectrum nearly disappear in the 1L MoS2-Au hybrid system. The charge transfer at the 1L MoS2-Au interface is responsible for this observation and the conclusion is also supported by Raman, photoluminescence, and differential reflectance measurements. These results reveal the impact of the Au substrate on the dielectric response of 2D monolayers with strong excitonic effect and will deepen our understanding of the 1L MoS2-Au interaction.
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