Direct X-Ray Measurements of Strain in Monolayer MoS$_{2}$ from Capping Layers and Geometrical Features
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| author | Neilson, Kathryn Jaikissoon, Marc Zakhidov, Dante Peña, Tara Salleo, Alberto Saraswat, Krishna Pop, Eric |
| author_facet | Neilson, Kathryn Jaikissoon, Marc Zakhidov, Dante Peña, Tara Salleo, Alberto Saraswat, Krishna Pop, Eric |
| contents | Strain induced through fabrication, both by patterning and capping, can be used to change the properties of two-dimensional (2D) materials or other thin films. Here, we explore how capping layers impart strain to monolayer MoS$_{2}$ using direct x-ray diffraction measurements of the lattice. We first observe the impact of naturally-oxidized metal layers ($\sim$1.5 nm Al) and subsequently-deposited Al$_{2}$O$_{3}$ (15 nm to 25 nm thick) on the 2D material, and find that the strain imparted to MoS$_{2}$ is mainly controlled by the interfacial adhesion of the seed layer in addition to the substrate adhesion. Then, using test structures which mimic transistor contacts, we measure enhanced strain from such patterns compared to blanket films. Furthermore, we observe significant tensile strain - up to 2% in monolayer MoS$_{2}$, one of the largest experimental values to date on a rigid substrate - due to highly-stressed blanket metal capping layers. These results provide direct evidence supporting previous reports of strain effects in 2D material devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_13658 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Direct X-Ray Measurements of Strain in Monolayer MoS$_{2}$ from Capping Layers and Geometrical Features Neilson, Kathryn Jaikissoon, Marc Zakhidov, Dante Peña, Tara Salleo, Alberto Saraswat, Krishna Pop, Eric Materials Science Strain induced through fabrication, both by patterning and capping, can be used to change the properties of two-dimensional (2D) materials or other thin films. Here, we explore how capping layers impart strain to monolayer MoS$_{2}$ using direct x-ray diffraction measurements of the lattice. We first observe the impact of naturally-oxidized metal layers ($\sim$1.5 nm Al) and subsequently-deposited Al$_{2}$O$_{3}$ (15 nm to 25 nm thick) on the 2D material, and find that the strain imparted to MoS$_{2}$ is mainly controlled by the interfacial adhesion of the seed layer in addition to the substrate adhesion. Then, using test structures which mimic transistor contacts, we measure enhanced strain from such patterns compared to blanket films. Furthermore, we observe significant tensile strain - up to 2% in monolayer MoS$_{2}$, one of the largest experimental values to date on a rigid substrate - due to highly-stressed blanket metal capping layers. These results provide direct evidence supporting previous reports of strain effects in 2D material devices. |
| title | Direct X-Ray Measurements of Strain in Monolayer MoS$_{2}$ from Capping Layers and Geometrical Features |
| topic | Materials Science |
| url | https://arxiv.org/abs/2411.13658 |