Compositional Phase Change of Early Transition Metal Diselenide (VSe<sub>2</sub> and TiSe<sub>2</sub>) Ultrathin Films by Postgrowth Annealing

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  • Manuel Bonilla
    Department of Physics University of South Florida Tampa FL 33620 USA
  • Sadhu Kolekar
    Department of Physics University of South Florida Tampa FL 33620 USA
  • Jiangfeng Li
    Department of Physics University of South Florida Tampa FL 33620 USA
  • Yan Xin
    National High Magnetic Field Laboratory Florida State University Tallahassee FL 32310 USA
  • Paula Mariel Coelho
    Department of Physics University of South Florida Tampa FL 33620 USA
  • Kinga Lasek
    Department of Physics University of South Florida Tampa FL 33620 USA
  • Krzysztof Zberecki
    Faculty of Physics Warsaw University of Technology ul. Koszykowa 75 Warsaw 00‐662 Poland
  • Daniel Lizzit
    Elettra‐Sincrotrone Trieste S.C.p.A. Strada Statale 14 Km 163.5 Trieste I‐34149 Italy
  • Ezequiel Tosi
    Elettra‐Sincrotrone Trieste S.C.p.A. Strada Statale 14 Km 163.5 Trieste I‐34149 Italy
  • Paolo Lacovig
    Elettra‐Sincrotrone Trieste S.C.p.A. Strada Statale 14 Km 163.5 Trieste I‐34149 Italy
  • Silvano Lizzit
    Elettra‐Sincrotrone Trieste S.C.p.A. Strada Statale 14 Km 163.5 Trieste I‐34149 Italy
  • Matthias Batzill
    Department of Physics University of South Florida Tampa FL 33620 USA

書誌事項

公開日
2020-06-08
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#am
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/admi.202000497
公開者
Wiley

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説明

<jats:title>Abstract</jats:title><jats:p>The transition metal selenides M<jats:sub>1+</jats:sub><jats:italic><jats:sub>y</jats:sub></jats:italic>Se<jats:sub>2</jats:sub> (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‐Se<jats:sub>2</jats:sub> 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.</jats:p>

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