journal article·2022-09Open access

Chemical Vapor Deposition of High‐Optical‐Quality Large‐Area Monolayer Janus Transition Metal Dichalcogenides

Ziyang Gan, Ioannis Paradisanos, Ana Estrada‐Real, Julian Picker, Emad Najafidehaghani, Francis Davies, Christof Neumann, Cedric Robert, Peter Wiecha, Kenji Watanabe, Takashi Taniguchi, Xavier Marie, Johannes Biskupek, Manuel Mundszinger, Robert Leiter, Ute Kaiser, Arkady V. Krasheninnikov, Bernhard Urbaszek, Antony George, Andrey Turchanin

Advanced Materials· Volume 34· Issue 38

Abstract

Abstract One‐pot chemical vapor deposition (CVD) growth of large‐area Janus SeMoS monolayers is reported, with the asymmetric top (Se) and bottom (S) chalcogen atomic planes with respect to the central transition metal (Mo) atoms. The formation of these 2D semiconductor monolayers takes place upon the thermodynamic‐equilibrium‐driven exchange of the bottom Se atoms of the initially grown MoSe2 single crystals on gold foils with S atoms. The growth process is characterized by complementary experimental techniques including Raman and X‐ray photoelectron spectroscopy, transmission electron microscopy, and the growth mechanisms are rationalized by first principle calculations. The remarkably high optical quality of the synthesized Janus monolayers is demonstrated by optical and magneto‐optical measurements which reveal the strong exciton–phonon coupling and enable an exciton g‐factor of −3.3.
Source: crossref · Quality: baseline

Research context

OpenAlex topics: 2D Materials and Applications · Quantum Dots Synthesis And Properties · Chalcogenide Semiconductor Thin Films

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

Affiliations

Institute of Physical Chemistry Friedrich Schiller University Jena 07743 Jena Germany

Université de Toulouse INSA‐CNRS‐UPS LPCNO Toulouse 31077 France

Institute of Ion Beam Physics and Materials Research Helmholtz‐Centre Dresden‐Rossendorf 01328 Dresden Germany

LAAS‐CNRS Université de Toulouse Toulouse 31400 France

Research Center for Functional Materials National Institute for Materials Science Tsukuba 305‐0044 Japan

International Center for Materials Nanoarchitectonics National Institute for Materials Science Tsukuba 305‐0044 Japan

Central Facility of Electron Microscopy Electron Microscopy Group of Material Science University of Ulm D‐89081 Ulm Germany

Department of Applied Physics Aalto University Aalto 00076 Finland

Department of Physics Technische Universität Darmstadt 64289 Darmstadt Germany

Abbe Center of Photonics 07745 Jena Germany

Funding

Deutsche Forschungsgemeinschaft · Core Research for Evolutional Science and Technology

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