期刊
ADVANCED MATERIALS
卷 34, 期 38, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202205226
关键词
2D materials; exciton-phonon coupling; high optical quality; Janus transition metal dichalcogenides; monolayers
类别
资金
- Deutsche Forschungsgemeinschaft (DFG) [INST 275/257-1 FUGG (313713174), CRC 1375 NOA, 398816777, SPP2244, TU149/13-1, 443361515, 464283495, KR 4866/8-1, SFB-1415-417590517]
- European Union
- DFG research and innovation programme FLAG-ERA [TU149/9-1 (397373225)]
- Institute for Quantum Technologies Occitanie
- Institut Universitaire de France
- Elemental Strategy Initiative by the MEXT, Japan [JPMXP0112101001]
- JSPS KAKENHI [JP20H00354]
- CREST, JST [JPMJCR15F3]
- ANR IXTASE
- Projekt DEAL
In this study, a one-pot chemical vapor deposition (CVD) method is used to successfully grow large-area Janus SeMoS monolayers. The growth mechanism is revealed through experimental and computational methods, and the synthesized monolayers are shown to possess high optical quality.
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.
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