Biaxial versus uniaxial strain tuning of single-layer MoS2
Strain engineering has arisen as a powerful technique to tune the electronic and optical properties of two-dimensional semiconductors like molybdenum disulfide (MoS2). Although several theoretical works predicted that biaxial strain would be more effective than uniaxial strain to tune the band struc...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/375687 |
| Acceso en línea: | http://hdl.handle.net/10261/375687 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85106602559&doi=10.1016%2fj.nanoms.2021.03.001&partnerID=40&md5=c55d835e3790d1754b424cfd0ea76f2e |
| Access Level: | acceso abierto |
| Palabra clave: | 2D materials biaxial strain MoS2 reflectance spectra Strain engineering uniaxial strain |
| Sumario: | Strain engineering has arisen as a powerful technique to tune the electronic and optical properties of two-dimensional semiconductors like molybdenum disulfide (MoS2). Although several theoretical works predicted that biaxial strain would be more effective than uniaxial strain to tune the band structure of MoS2, a direct experimental verification is still missing in the literature. Here we implemented a simple experimental setup that allows to apply biaxial strain through the bending of a cruciform polymer substrate. We used the setup to study the effect of biaxial strain on the differential reflectance spectra of 12 single-layer MoS2 flakes finding a redshift of the excitonic features at a rate between −40 meV/% and −110 meV/% of biaxial tension. We also directly compare the effect of biaxial and uniaxial strain on the same single-layer MoS2 finding that the biaxial strain gauge factor is 2.3 times larger than the uniaxial strain one. © 2021 Chongqing University |
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