Influence of Nanostructuration on the Vibrational, Electronic and Optical Properties of CrSi<sub>2</sub> Thin Films - Laboratoire Charles Coulomb (L2C) Accéder directement au contenu
Article Dans Une Revue Journal of Physical Chemistry C Année : 2020

Influence of Nanostructuration on the Vibrational, Electronic and Optical Properties of CrSi2 Thin Films

Résumé

We report a detailed experimental investigation of the influence of the formation of nano-crystallites on the vibrational, electronic and optical properties of CrSi2 thin films. Both amorphous and nanostructured thin films were investigated by means of electrical resistivity, Hall effect measurements as well as Raman and infrared spectroscopies. We show that both types of films exhibit a semiconducting-like behavior, with the notable difference that the high defect concentrations in amorphous films act as hole donors, modifying the electronic band structure and optical constants. The effect of the film thickness on electrical properties is well captured by the Fuchs-Sondheimer model indicating a decrease in the charge carrier mean free path, likely due to the formation of amorphous/nano-crystallite interfaces that contribute to strongly scatter the charge carriers. Raman spectroscopy performed on nano-crystallized thin films evidences the presence of a Raman-active mode at 229 cm-1 and confirms DFT calculations predicting a mode at 248 cm-1, the observation of which had remained elusive so far in polycrystalline CrSi2. Measurements of the refractive index and dielectric constants of amorphous thin films show a very high refractive index in the mid-IR range. Our results illustrate how the controlled growth of nano-crystallites can be used to tailor the electronic, vibrational and optical properties of amorphous thin films.
Fichier principal
Vignette du fichier
Revised Manuscript.pdf (1.4 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03373384 , version 1 (11-10-2021)

Identifiants

Citer

Adrien Moll, Patrick Hermet, Jean-Louis Bantignies, Christophe Candolfi, Bertrand Lenoir, et al.. Influence of Nanostructuration on the Vibrational, Electronic and Optical Properties of CrSi2 Thin Films. Journal of Physical Chemistry C, 2020, 124 (51), pp.28267-28276. ⟨10.1021/acs.jpcc.0c08740⟩. ⟨hal-03373384⟩
82 Consultations
87 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More