Synthesis and Characterization of MoS2/WS2 Heterostructures by Second Harmonic Generation

Author(s)

Vianna, Pilar G. ; Safeer, Syed Hamza ; Ore, Alexandre S. M. V. ; Gordo, Vanessa O. ; Carvalho, Isabel C. S. ; Carozo, Victor ; de Matos, Christiano J. S. ; IEEE

• Document type: Journal article
• Source: 2019 SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE (SBFOTON IOPC); v. N/A, p. 4-pg., 2019-01-01.

Abstract

Monolayers of MoS2 and WS2, as well as their vertical heterostructures, were synthesized via chemical vapor deposition. The samples were then characterized via micro-Raman and micro-photoluminescence spectroscopies, and by second harmonic generation (SHG). SHG confirms that the layers in bilayers and heterostructures grow with similar to 0 degrees (or similar to 60 degrees) relative twist angle. Interestingly, SHG is observed in MoS2 bilayers, indicating a deviation from the centrosymmetric 2H phase. (AU)

• FAPESP's process: 12/50259-8 - Graphene: photonics and opto-electronics: UPM-NUS collaboration
• Grantee: Antonio Helio de Castro Neto
• Support Opportunities: Research Projects - SPEC Program
• FAPESP's process: 15/11779-4 - Plasmonic and nonlinear effects in graphene coupled to optical waveguides
• Grantee: Christiano José Santiago de Matos
• Support Opportunities: Research Projects - Thematic Grants