Capeccia, M. and D’Alò, B. and Stellino, E. (2024) Investigating the effects of sample-substrate interaction in the Raman and photoluminescence spectrum of 1L-WS2. Il nuovo cimento C, 47 (5). pp. 1-4. ISSN 1826-9885
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Abstract
We carried out a spectroscopic investigation on monolayer (1L) crystals of WS2 deposited on different substrates, namely PDMS, silica, gold, hBN, and diamond, by Raman and photoluminescence measurements. Two spectral features were identified, which assess the degree of strain and doping transferred to the 1LWS2 flake by the substrate. The first one is the frequency of the E1 2g(Γ) peak in the Raman spectrum, whose blueshift is associated with an increase in the tensile strain applied to the 1L-WS2 crystal. The second one is the intensity ratio of the trion to exciton band in the photoluminescence spectrum, related to the density of electrons in excess from doping levels. A comparative analysis of the 1L-WS2 spectra collected on the different substrates reveals that the flakes deposited on diamond are those displaying a higher degree of strain and doping, possibly due to the large presence of C dangling bonds. Our results represent a valuable reference for high-pressure optical measurements on low-dimensional transition metal dichalcogenides, in which 1L flakes are commonly exfoliated on the culet of Diamond Anvil Cells.
| Item Type: | Article |
|---|---|
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 10 Jan 2025 11:44 |
| Last Modified: | 10 Jan 2025 11:44 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/23301 |
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