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

被引：38

作者：

Gan, Ziyang ^{[1
]}

Paradisanos, Ioannis ^{[2
]}

Estrada-Real, Ana ^{[2
]}

Picker, Julian ^{[1
]}

Najafidehaghani, Emad ^{[1
]}

Davies, Francis ^{[3
]}

Neumann, Christof ^{[1
]}

Robert, Cedric ^{[2
]}

Wiecha, Peter ^{[4
]}

Watanabe, Kenji ^{[5
]}

Taniguchi, Takashi ^{[6
]}

Marie, Xavier ^{[2
]}

Biskupek, Johannes ^{[7
]}

Mundszinger, Manuel ^{[7
]}

Leiter, Robert ^{[7
]}

Kaiser, Ute ^{[7
]}

Krasheninnikov, Arkady, V ^{[3
,8
]}

Urbaszek, Bernhard ^{[2
,9
]}

George, Antony ^{[1
,10
]}

Turchanin, Andrey ^{[1
,10
]}

机构：

[1] Friedrich Schiller Univ Jena, Inst Phys Chem, D-07743 Jena, Germany

[2] Univ Toulouse, INSA CNRS UPS, LPCNO, F-31077 Toulouse, France

[3] Helmholtz Ctr Dresden Rossendorf, Inst Ion Beam Phys & Mat Res, D-01328 Dresden, Germany

[4] Univ Toulouse, LAAS, CNRS, F-31400 Toulouse, France

[5] Natl Inst Mat Sci, Res Ctr Funct Mat, Tsukuba, Ibaraki 3050044, Japan

[6] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, Tsukuba, Ibaraki 3050044, Japan

[7] Univ Ulm, Cent Facil Electron Microscopy, Electron Microscopy Grp Mat Sci, D-89081 Ulm, Germany

[8] Aalto Univ, Dept Appl Phys, Aalto 00076, Finland

[9] Tech Univ Darmstadt, Dept Phys, D-64289 Darmstadt, Germany

[10] Abbe Ctr Photon, D-07745 Jena, Germany

来源：

ADVANCED MATERIALS | 2022年 / 34卷 / 38期

关键词：

2D materials; exciton-phonon coupling; high optical quality; Janus transition metal dichalcogenides; monolayers; ALLOYS;

D O I：

10.1002/adma.202205226

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页数：9

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