Spectroscopic thickness and quality metrics for PtSe2 layers produced by top-down and bottom-up techniques
Thin films of noble-metal-based transition metal dichalcogenides, such as PtSe2, have attracted increasing attention due to their interesting layer-number dependent properties and application potential. While it is difficult to cleave bulk crystals down to mono- and few-layers, a range of growth tec...
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| Main Authors: | , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
October 2020
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| In: |
2D Materials
Year: 2020, Volume: 7, Issue: 4, Pages: 1-20 |
| ISSN: | 2053-1583 |
| DOI: | 10.1088/2053-1583/aba9a0 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1088/2053-1583/aba9a0 Verlag, lizenzpflichtig, Volltext: https://iopscience.iop.org/article/10.1088/2053-1583/aba9a0 
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| Author Notes: | Beata M Szydłowska, Oliver Hartwig, Bartlomiej Tywoniuk, Tomáš Hartman, Tanja Stimpel-Lindner, Zdeněk Sofer, Niall McEvoy, Georg S Duesberg and Claudia Backes |
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| 245 | 1 | 0 | |a Spectroscopic thickness and quality metrics for PtSe2 layers produced by top-down and bottom-up techniques |c Beata M Szydłowska, Oliver Hartwig, Bartlomiej Tywoniuk, Tomáš Hartman, Tanja Stimpel-Lindner, Zdeněk Sofer, Niall McEvoy, Georg S Duesberg and Claudia Backes |
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| 520 | |a Thin films of noble-metal-based transition metal dichalcogenides, such as PtSe2, have attracted increasing attention due to their interesting layer-number dependent properties and application potential. While it is difficult to cleave bulk crystals down to mono- and few-layers, a range of growth techniques have been established producing material of varying quality and layer number. However, to date, no reliable high-throughput characterization to assess layer number exists. Here, we use top-down liquid phase exfoliation (LPE) coupled with centrifugation to produce PtSe2 nanosheets of varying sizes and thicknesses with a low degree of basal plane defectiveness. Measurement of the dimensions by statistical atomic force microscopy allows us to quantitatively link information contained in optical spectra to the dimensions. For LPE nanosheets we establish metrics for lateral size and layer number based on extinction spectroscopy. Further, we compare the Raman spectroscopic response of LPE nanosheets with micromechanically exfoliated PtSe2, as well as thin films produced by a range of bottom up techniques. We demonstrate that the Eg 1 peak position and the intensity ratio of the Eg 1/A1g 1 peaks can serve as a robust metric for layer number across all sample types.This will be of importance in future benchmarking of PtSe2 films. | ||
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| 700 | 1 | |a Tywoniuk, Bartlomiej |e VerfasserIn |4 aut | |
| 700 | 1 | |a Hartman, Tomáš |e VerfasserIn |4 aut | |
| 700 | 1 | |a Stimpel-Lindner, Tanja |e VerfasserIn |4 aut | |
| 700 | 1 | |a Sofer, Zdeněk |e VerfasserIn |4 aut | |
| 700 | 1 | |a McEvoy, Niall |e VerfasserIn |4 aut | |
| 700 | 1 | |a Duesberg, Georg S |e VerfasserIn |4 aut | |
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