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Identify intrinsic vibrational fingerprints of sulfur vacancies in monolayer MoS2 and distinguish intrinsic defect dynamics from environmental doping effects.

May 10, 20262D MaterialsOpen Access

In situ Raman study on sulfur vacancies in monolayer MoS 2

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Authors

LDLeon DanielUniversity of Duisburg-Essen YLYossarian LiebschUniversity of Duisburg-Essen CLCharleen LintzUniversity of Duisburg-Essen

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Implication

In situ Raman spectroscopy reveals distinct spectral fingerprints of sulfur vacancies in monolayer MoS2, indicating reversible ambient doping effects on defect metrology.

Key Points

Identify intrinsic vibrational fingerprints of sulfur vacancies in monolayer MoS2 and distinguish intrinsic defect dynamics from environmental doping effects.
Irradiated monolayer MoS2 with low-energy (600 eV) Ar+ ions in an ultrahigh vacuum chamber across multiple fluences.
Tracked structural changes using in situ Raman spectroscopy and characterized atomic structure with scanning transmission electron microscopy (STEM).
Conducted controlled ambient air exposure and subsequent vacuum remeasurements under laser illumination to evaluate reversible extrinsic doping.
Atomic-resolution STEM identified randomly distributed sulfur vacancies as the dominant structural defect generated by low-energy irradiation.
Increasing ion fluence produced an E1_2g mode downshift and broadening, an A1g mode upshift and broadening, and activated defect features including an LA(M) mode.
Ambient exposure induced reversible p-doping marked by additional A1g upshift and narrowing (apparent charge transfer of ~0.02 e per vacancy), with negligible oxidation.

Cite This Study

Daniel et al. (2026) studied this question.

synapsesocial.com/papers/6aa51f8a3f249affa9f4bdc1 https://doi.org/10.1088/2053-1583/ae6b2b

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Implication

In situ Raman spectroscopy reveals distinct spectral fingerprints of sulfur vacancies in monolayer MoS2, indicating reversible ambient doping effects on defect metrology.

In situ Raman study on sulfur vacancies in monolayer MoS 2

Discussion

Member takes

Implication

Key Points

Cite This Study

In situ Raman study on sulfur vacancies in monolayer MoS 2

Discussion

Member takes

Implication

Key Points

Cite This Study

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