Growth and Thermo-driven Crystalline Phase Transition of Metastable Monolayer 1T'-WSe2 Thin Film.

Abstract:

:Two-dimensional (2D) transition metal dichalcogenides MX2 (M = Mo, W, X = S, Se, Te) attracts enormous research interests in recent years. Its 2H phase possesses an indirect to direct bandgap transition in 2D limit, and thus shows great application potentials in optoelectronic devices. The 1T' crystalline phase transition can drive the monolayer MX2 to be a 2D topological insulator. Here we realized the molecular beam epitaxial (MBE) growth of both the 1T' and 2H phase monolayer WSe2 on bilayer graphene (BLG) substrate. The crystalline structures of these two phases were characterized using scanning tunneling microscopy. The monolayer 1T'-WSe2 was found to be metastable, and can transform into 2H phase under post-annealing procedure. The phase transition temperature of 1T'-WSe2 grown on BLG is lower than that of 1T' phase grown on 2H-WSe2 layers. This thermo-driven crystalline phase transition makes the monolayer WSe2 to be an ideal platform for the controlling of topological phase transitions in 2D materials family.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Chen W,Xie X,Zong J,Chen T,Lin D,Yu F,Jin S,Zhou L,Zou J,Sun J,Xi X,Zhang Y

doi

10.1038/s41598-019-39238-7

subject

Has Abstract

pub_date

2019-02-25 00:00:00

pages

2685

issue

1

issn

2045-2322

pii

10.1038/s41598-019-39238-7

journal_volume

9

pub_type

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