Evidence for a narrow band gap phase in 1T′ WS 2 nanosheet - Labex MATISSE Accéder directement au contenu
Article Dans Une Revue Applied Physics Letters Année : 2019

Evidence for a narrow band gap phase in 1T′ WS 2 nanosheet

Debora Pierucci
Jihene Zribi
  • Fonction : Auteur
  • PersonId : 1035942
Clément Livache
Charlie Gréboval
Mathieu G Silly
Julien Chaste
Benoit Mahler

Résumé

While 1T′ phase-pure MX2 (M = Mo, W; X = Se, Te) have recently been reported to be superconductors, Weyl semimetals, or quantum spin Hall insulators, the electronic properties of phase-pure 1T′-WS2 samples are still lacking thorough investigation. Here, we report the study of single-layer 1T′-WS2 nanosheets prepared from lithium exfoliation of WS2. We confirmed the composition and structure of single layer 1T′-WS2 flakes using X-ray photoelectron spectroscopy, Raman spectroscopy, and aberration corrected transmission electron microscopy (STEM). The distorted octahedral structure related to the 1T′ phase with a 2a × 2a superstructure is evidenced using STEM. Photoemission and electronic measurements uncover the presence of a narrow bandgap (>120 meV) in the 1T′-WS2 nanosheets, which is completely different from semiconducting bulk or single-layer 1H-WS2. The material is found to be ambipolar with a p-type nature. At low temperatures, a slow photoresponse is also observed.
Fichier principal
Vignette du fichier
1T' WS2_round2_vhal.pdf (799.73 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02267954 , version 1 (25-08-2020)

Identifiants

Citer

Debora Pierucci, Jihene Zribi, Clément Livache, Charlie Gréboval, Mathieu G Silly, et al.. Evidence for a narrow band gap phase in 1T′ WS 2 nanosheet. Applied Physics Letters, 2019, 115 (3), pp.032102. ⟨10.1063/1.5091997⟩. ⟨hal-02267954⟩
68 Consultations
356 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More