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

Autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: 2019 SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE (SBFOTON IOPC); v. N/A, p. 4-pg., 2019-01-01.

Resumo

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)

• Processo FAPESP: 12/50259-8 - Grafeno: fotônica e opto-eletrônica: colaboração UPM-NUS
• Beneficiário: Antonio Helio de Castro Neto
• Modalidade de apoio: Auxílio à Pesquisa - Programa SPEC
• Processo FAPESP: 15/11779-4 - Efeitos plasmônicos e não-lineares em grafeno acoplado a guias de onda ópticos
• Beneficiário: Christiano José Santiago de Matos
• Modalidade de apoio: Auxílio à Pesquisa - Temático