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Moiré superlattices based on van der Waals layered materials have attracted significant attention due to their rich quantum phenomena and potential applications in optoelectronics. As a building block for moiré superlattices, Janus monolayers of transition metal dichalcogenides (TMDCs) are promising because of their out-of-plane structural asymmetry and associated built-in electric field, which is predicted to lead to the modulation of optical dipole interactions and high-temperature exciton condensation states. However, the moiré superlattice structure of Janus heterobilayers and their excitonic properties have yet to be investigated experimentally. Here we report the structure analysis and excitonic properties of moiré superlattice of chemically-tailored Janus heterobilayers. The Janus heterobilayer MoSSe/MoSe2 (or WSSe/WSe2) was fabricated by replacement of top layer Se atoms with S atoms in bilayer MoSe2 (or WSe2) by plasma treatment. An average moiré period of approximately 13 nm was formed by lattice mismatch as revealed by scanning transmission electron microscopy (STEM) observations. Cryogenic temperature PL spectra show sharp, near-infrared emissions, which can be assigned to excitons trapped by moiré potentials from comparison with first-principles calculation results. Our work provides a new class moiré material for studying tunable excitonic systems and related quantum phenomena.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Single-layer graphene, molecular beam epitaxy, hexagonal boron nitride

Date published: 2024-03-02

Publisher: Wiley

Journal:

• Small Structures (ISSN: 26884062) vol. 5 issue. 5 2300514

Funding:

• Japan Society for the Promotion of Science JP20H00127
• Japan Society for the Promotion of Science JP21H05232
• Japan Society for the Promotion of Science JP21H05233
• Japan Society for the Promotion of Science JP21H05234
• Japan Society for the Promotion of Science JP21H05235
• Japan Society for the Promotion of Science JP21H05236
• Japan Society for the Promotion of Science JP22H00280
• Japan Society for the Promotion of Science JP22H00283
• Japan Society for the Promotion of Science JP22K18986
• Japan Society for the Promotion of Science JP22H04957
• Japan Society for the Promotion of Science JP22H05441
• Japan Society for the Promotion of Science JP22KJ2561
• Japan Society for the Promotion of Science JP23K13635
• Japan Society for the Promotion of Science JP23H02052
• Japan Society for the Promotion of Science JP23H01807
• Core Research for Evolutional Science and Technology JPMJCR20T3
• Core Research for Evolutional Science and Technology JPMJFR213X
• Precursory Research for Embryonic Science and Technology JPMJPR23H5
• Japan Society for the Promotion of Science JP19H00664
• Japan Society for the Promotion of Science JP20H00354
• Japan Society for the Promotion of Science JP20H05664
• Japan Society for the Promotion of Science JP20K14415
• Japan Society for the Promotion of Science JP20H01840

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1002/sstr.202300514

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Updated at: 2025-02-23 22:45:58 +0900

Published on MDR: 2025-02-23 22:45:58 +0900