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- Title
Compositional Phase Change of Early Transition Metal Diselenide (VSe<sub>2</sub> and TiSe<sub>2</sub>) Ultrathin Films by Postgrowth Annealing.
- Authors
Bonilla, Manuel; Kolekar, Sadhu; Li, Jiangfeng; Xin, Yan; Coelho, Paula Mariel; Lasek, Kinga; Zberecki, Krzysztof; Lizzit, Daniel; Tosi, Ezequiel; Lacovig, Paolo; Lizzit, Silvano; Batzill, Matthias
- Abstract
The transition metal selenides M1+ySe2 (M = V, Ti) have intriguing quantum properties, which make them target materials for controlling properties by thinning them to the ultrathin limit. An appropriate approach for the synthesis of such ultrathin films is by molecular beam epitaxy. Here, it is shown that such synthesized V‐ and Ti‐Se2 films can undergo a compositional change by vacuum annealing. Combined scanning tunneling and photoemission spectroscopy is used to determine compositional and structural changes of ultrathin films as a function of annealing temperature. Loss of selenium from the film is accompanied by a morphology change of monolayer height islands to predominantly bilayer height. In addition, crystal periodicity and atomic structure changes are observed. These changes are consistent with a transition from a layered transition metal dichalcogenide (TMDC) to ordered intercalation compounds with V or Ti intercalated in between two layers of their respective TMDCs. These observations may clear up misconception of the nature of previously reported high‐temperature grown transition metal selenides. More significantly, the demonstrated control of the formation of intercalation compounds is a key step toward modifying properties in van der Waals systems and toward expanding material systems for van der Waals heterostructures.
- Subjects
THIN films; TRANSITION metals; TRANSITION metal alloys; MOLECULAR beam epitaxy; PHOTOELECTRON spectroscopy; MONOMOLECULAR films
- Publication
Advanced Materials Interfaces, 2020, Vol 7, Issue 15, p1
- ISSN
2196-7350
- Publication type
Article
- DOI
10.1002/admi.202000497