Decoupling molybdenum disulfide from its substrate by cesium intercalation - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physical Chemistry C Année : 2020

Decoupling molybdenum disulfide from its substrate by cesium intercalation

Alain Marty
Matthieu Jamet
Yannick Dappe

Résumé

Intercalation of alkali atoms within the lamellar transition metal dichalcogenides is a possible route toward a new generation of batteries. It is also a way to induce structural phase transitions authorizing the realization of optical and electrical switches in this class of materials. The process of intercalation has been mostly studied in three-dimensional dichalcogenide films. Here, we address the case of a single-layer of molybdenum disulfide (MoS$_2$), deposited on a gold substrate, and intercalated with cesium (Cs) in ultra-clean conditions (ultrahigh vacuum). We show that intercalation decouples MoS$_2$ from its substrate. We reveal electron transfer from Cs to MoS$_2$, relative changes in the energy of the valence band maxima, and electronic disorder induced by structural disorder in the intercalated Cs layer. Besides, we find an abnormal lattice expansion of MoS$_2$, which we relate to immediate vicinity of Cs. Intercalation is thermally activated, and so is the reverse process of de-intercalation. Our work opens the route to a microscopic understanding of a process of relevance in several possible future technologies, and shows a way to manipulate the properties of two-dimensional dichalcogenides by "under-cover" functionalization.
Fichier principal
Vignette du fichier
2006.05765.pdf (2.56 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-02863559 , version 1 (05-04-2024)

Identifiants

Citer

Roberto Sant, Simone Lisi, van Dung Nguyen, Estelle Mazaleyrat, Ana Cristina Gomez Herrero, et al.. Decoupling molybdenum disulfide from its substrate by cesium intercalation. Journal of Physical Chemistry C, 2020, 124 (23), pp.12397-12408. ⟨10.1021/acs.jpcc.0c00970⟩. ⟨hal-02863559⟩
94 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More