We present a spectroscopic investigation of the vibrational and optoelectronic properties of WS2 domes in the 0-0.65 GPa range. The pressure evolution of the system morphology, deduced by the combined analysis of Raman and photoluminescence spectra, revealed a significant variation in the dome's aspect ratio. The modification of the dome shape caused major changes in the mechanical properties of the system resulting in a sizable increase of the out-of-plane compressive strain while keeping the in-plane tensile strain unchanged. The variation of the strain gradients drives a nonlinear behavior in both the exciton energy and radiative recombination intensity, interpreted as the consequence of a hybridization mechanism between the electronic states of two distinct minima in the conduction band. Our results indicate that pressure and strain can be efficiently combined in low dimensional systems with unconventional morphology to obtain modulations of the electronic band structure not achievable in planar crystals.
Fine-tuning of the excitonic response in monolayer WS2 domes via coupled pressure and strain variation / Stellino, Elena; D'Alò, Beatrice; Blundo, Elena; Postorino, Paolo; Polimeni, Antonio. - In: NANO LETTERS. - ISSN 1530-6992. - 24:13(2024), pp. 3945-3951. [10.1021/acs.nanolett.4c00157]
Fine-tuning of the excitonic response in monolayer WS2 domes via coupled pressure and strain variation
Stellino, ElenaPrimo
Writing – Original Draft Preparation
;D'Alò, Beatrice
Secondo
Data Curation
;Blundo, ElenaMethodology
;Postorino, PaoloSupervision
;Polimeni, AntonioUltimo
Conceptualization
2024
Abstract
We present a spectroscopic investigation of the vibrational and optoelectronic properties of WS2 domes in the 0-0.65 GPa range. The pressure evolution of the system morphology, deduced by the combined analysis of Raman and photoluminescence spectra, revealed a significant variation in the dome's aspect ratio. The modification of the dome shape caused major changes in the mechanical properties of the system resulting in a sizable increase of the out-of-plane compressive strain while keeping the in-plane tensile strain unchanged. The variation of the strain gradients drives a nonlinear behavior in both the exciton energy and radiative recombination intensity, interpreted as the consequence of a hybridization mechanism between the electronic states of two distinct minima in the conduction band. Our results indicate that pressure and strain can be efficiently combined in low dimensional systems with unconventional morphology to obtain modulations of the electronic band structure not achievable in planar crystals.File | Dimensione | Formato | |
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