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Intermediate State between MoSe2 and Janus MoSeS during Atomic Substitution Process
Hiroo Suzuki1,2, Yijun Liu1, Masaaki Misawa1,2
1Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan.
Researchers explored the intermediate stages of creating Janus transition metal dichalcogenides (TMDCs) using plasma processing. They identified a partially substituted Janus structure and its unique Raman modes, advancing the understanding of TMDC synthesis.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Janus transition metal dichalcogenides (TMDCs) possess unique out-of-plane polarization due to dissimilar chalcogen atoms.
- Existing plasma synthesis methods for Janus TMDCs lack a complete understanding of formation dynamics and intermediate electronic states.
Purpose of the Study:
- To investigate the intermediate states during the plasma-assisted synthesis of Janus Molybdenum Diselenide Sulfide (MoSeS) from Molybdenum Diselenide (MoSe2).
- To elucidate the structural and electronic properties of these intermediate states.
Main Methods:
- Plasma processing of MoSe2.
- Atomic composition analysis and atomic-scale structural observations.
- Theoretical calculations and photoluminescence (PL) spectroscopy.
Main Results:
- Identification of a partially substituted Janus (PSJ) structure as a key intermediate.
- Clarification of characteristic Raman modes associated with the PSJ structure.
- Observation of discontinuous transitions in PL spectra, not fully explained by theoretical models.
Conclusions:
- The study reveals the PSJ structure as a crucial intermediate in Janus TMDC formation via plasma processing.
- Understanding these intermediate states and their electronic properties is vital for controlling Janus TMDC synthesis.
- Further investigation is needed to reconcile experimental PL observations with theoretical predictions.
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