journal article·2022-03-01Open access

Modification of monolayer 1T-VSe2 by selective deposition of vanadium and tellurium

Abhishek Karn, Yang Hao Chan, Ulysse Chazarin, Peng Chen, Woei Wu Pai

AIP Advances· Volume 12· Issue 3

Abstract

Hetero-structures of transition metal dichalcogenide (TMD) layers offer vast possibilities of new materials properties. The growth behaviors of such TMD hetero-structures can be complex. In this study, we report the structure modification of a VSe2 monolayer by the molecular beam deposition of Te, V, or both. With a typical growth temperature of 300 °C and a nominal flux rate, we found that Te deposition leaves the VSe2 intact. Vanadium deposition, in contrast, leads to small clusters ordered in stripes along well-defined directions. The charge density wave symmetry of monolayer VSe2 surprisingly changes in small regions enclosed by such vanadium stripes. With V and Te co-deposition, a dramatic change of the monolayer surface structure to a (2 × 1) ordered phase is observed. This study illustrates the unexpected complexities involved in preparing even a simple bilayer TMD hetero-structure, such as VTe2/VSe2.
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Research context

OpenAlex topics: 2D Materials and Applications · Perovskite Materials and Applications · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, National Taiwan University 1 , No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan

Nano Science and Technology Program, Taiwan International Graduate Program, Academia Sinica and National Taiwan University 2 , No. 128, Sec. 2, Academia Road, Taipei 11529, Taiwan

Center for Condensed Matter Sciences, National Taiwan University 3 , No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan

Institute of Atomic and Molecular Sciences, Academia Sinica 4 , No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan

Physics Division, National Center for Theoretical Sciences 5 , No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan

School of Physics and Astronomy, Shanghai Jiao Tong University 6 , Shanghai 200240, China

Funding

Ministry of Science and Technology, Taiwan

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