Strain-dependent luminescence and piezoelectricity in monolayer transition metal dichalcogenides
| Autor: | Xiaoqin Li, Alex C. De Palma, Edward T. Yu, Jiamin Quan, Kayleigh Jones, Gabriel Cossio |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Photoluminescence Condensed matter physics Band gap Process Chemistry and Technology Exciton 02 engineering and technology Nanoindentation 021001 nanoscience & nanotechnology 01 natural sciences Piezoelectricity Surfaces Coatings and Films Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Transition metal 0103 physical sciences Monolayer Materials Chemistry Electrical and Electronic Engineering Deformation (engineering) 0210 nano-technology Instrumentation |
| Zdroj: | Journal of Vacuum Science & Technology B. 38:042205 |
| ISSN: | 2166-2754 2166-2746 |
| DOI: | 10.1116/6.0000251 |
| Popis: | The modification of optical and electronic properties of transition metal dichalcogenides via mechanical deformation has been widely studied. Their ability to withstand large deformations before rupture has enabled large tunability of the bandgap, and further, the spatially varying strain has been shown to control the spatial distribution of the bandgap and lead to effects such as carrier funneling. Monolayer transition metal dichalcogenides exhibit a significant piezoelectric effect that could couple to a spatially inhomogeneous strain distribution to influence electronic and optical behavior. We investigate both experimentally and theoretically an example case of photoluminescence in structures with a strain distribution similar to that employed in single-photon emitters but generated here via nanoindentation. Using a mechanical model for strain induced by nanoindentation, we show that piezoelectricity can result in charge densities reaching 1012 e/cm2 and can generate electrostatic potential variations on the order of ±0.1 V across the suspended monolayer. We analyze the implications of these results for luminescence and exciton transport in monolayer transition metal dichalcogenides with spatially varying strain. |
| Databáze: | OpenAIRE |
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