Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide The photoluminescence yield of monolayer MoS 2 was locally and durably enhanced by prolonged laser exposure, with significant alterations of the spectral weight of its exciton and trion subcomponents. Evidence from Raman and photoluminescence spectroscopy, tip-enhanced photoluminescence, atomic force microscopy, and photoemission spectroscopy allows the phenomenon to be rationalized as a photoinduced oxidation of sulfur vacancies mediated by ambient air. A decrease in the trion emission and a marked blue shift of the A 1 ′ Raman peak suggest p-type counterdoping. Nanoscale spectroscopies reveal that the enhanced photoluminescence emission comes from the very edge of the patterning laser spot, where photoinduced oxidation has occurred.
Authors: Ermes Peci, Yang Pan, Emma Spotorno, Lorenzo Ramò, Francesca Telesio, Michele Magnozzi, Zygmunt Miłosz, Luca Gregoratti, Matteo Amati, Nicolò Petrini, Ilka Kriegel, Dietrich R. T. Zahn, Maurizio Canepa, Francesco Bisio
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
Awards: G3555068974, G575684798
OpenAlex ID: W7106324006