Morphology-induced spectral modification of self-assembled WS 2 pyramids.

Autor: Komen I; Kavli Institute of Nanoscience, Department of Quantum Nanoscience, Delft University of Technology The Netherlands L.Kuipers@tudelft.nl., van Heijst SE; Kavli Institute of Nanoscience, Department of Quantum Nanoscience, Delft University of Technology The Netherlands L.Kuipers@tudelft.nl., Conesa-Boj S; Kavli Institute of Nanoscience, Department of Quantum Nanoscience, Delft University of Technology The Netherlands L.Kuipers@tudelft.nl., Kuipers L; Kavli Institute of Nanoscience, Department of Quantum Nanoscience, Delft University of Technology The Netherlands L.Kuipers@tudelft.nl.
Jazyk: angličtina
Zdroj: Nanoscale advances [Nanoscale Adv] 2021 Sep 30; Vol. 3 (22), pp. 6427-6437. Date of Electronic Publication: 2021 Sep 30 (Print Publication: 2021).
DOI: 10.1039/d1na00531f
Abstrakt: Due to their intriguing optical properties, including stable and chiral excitons, two-dimensional transition metal dichalcogenides (2D-TMDs) hold the promise of applications in nanophotonics. Chemical vapor deposition (CVD) techniques offer a platform to fabricate and design nanostructures with diverse geometries. However, the more exotic the grown nanogeometry, the less is known about its optical response. WS 2 nanostructures with geometries ranging from monolayers to hollow pyramids have been created. The hollow pyramids exhibit a strongly reduced photoluminescence with respect to horizontally layered tungsten disulphide, facilitating the study of their clear Raman signal in more detail. Excited resonantly, the hollow pyramids exhibit a great number of higher-order phononic resonances. In contrast to monolayers, the spectral features of the optical response of the pyramids are position dependent. Differences in peak intensity, peak ratio and spectral peak positions reveal local variations in the atomic arrangement of the hollow pyramid crater and sides. The position-dependent optical response of hollow WS 2 pyramids is characterized and attributed to growth-induced nanogeometry. Thereby the first steps are taken towards producing tunable nanophotonic devices with applications ranging from opto-electronics to non-linear optics.
Competing Interests: The authors declare no competing interests.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
Externí odkaz: