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Heterocontact-Triggered 1H to 1T′ Phase Transition in CVD-Grown Monolayer MoTe2 : Implications for Low Contact Resistance Electronic Devices

Khaustov, Vladislav O. (author)
Center for Nanotechnology Innovation, Pisa,Scuola Normale Superiore di Pisa
Convertino, Domenica (author)
Center for Nanotechnology Innovation, Pisa
Köster, Janis (author)
University of Ulm
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Zakharov, Alexei A. (author)
Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
Mohn, Michael J. (author)
University of Ulm
Gebeyehu, Zewdu M. (author)
Italian Institute of Technology,Center for Nanotechnology Innovation, Pisa
Martini, Leonardo (author)
Center for Nanotechnology Innovation, Pisa
Pace, Simona (author)
Center for Nanotechnology Innovation, Pisa,Italian Institute of Technology
Marini, Giovanni (author)
Italian Institute of Technology
Calandra, Matteo (author)
Paris-Sorbonne University,University of Trento,Italian Institute of Technology
Kaiser, Ute (author)
University of Ulm
Forti, Stiven (author)
Center for Nanotechnology Innovation, Pisa
Coletti, Camilla (author)
Center for Nanotechnology Innovation, Pisa,Italian Institute of Technology
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 (creator_code:org_t)
English.
In: ACS Applied Nano Materials. - 2574-0970.
Related links:
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Single-layer molybdenum ditelluride (MoTe2) has attracted attention due to the smaller energy difference between the semiconducting (1H) and semimetallic (1T′) phases with respect to other two-dimensional transition metal dichalcogenides (TMDs). Understanding the phenomenon of polymorphism between these structural phases is of great fundamental and practical importance. In this paper, we report a 1H to 1T′ phase transition occurring during the chemical vapor deposition (CVD) synthesis of single-layer MoTe2 at 730 °C. The transformation originates at the heterocontact between monoclinic and hexagonal crystals and progresses to either yield a partial or complete 1H to 1T′ phase transition. Microscopic and spectroscopic analyses of the MoTe2 crystals reveal the presence of Te vacancies and mirror twin boundaries (MTB) domains in the hexagonal phase. The experimental observations and theoretical simulations indicate that the combination of heterocontact formation and Te vacancies are relevant triggering mechanisms in the observed transformation. By advancing in the understanding and controlling of the direct synthesis of lateral 1T′/1H heterostructures, this work contributes to the development of MoTe2-based electronic and optoelectronic devices with low contact resistance.

Subject headings

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Keyword

CVD
heterocontact
HRTEM
monolayer
MoTe
phase transition
quantum materials

Publication and Content Type

art (subject category)
ref (subject category)

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