Occurring monthly during the academic year, the 2DCC Webinars present new technical scientific news from within the 2DCC facility and the broader scientific community, as well as, broader topics such as science related to diversity. The webinars are free with an online registration.

The slides with voice-over for past 2DCC Webinars (2016- ) are available by following the links in the menu.

Upcoming 2DCC Webinars: 

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Please join us for the spring 2024 webinar series: 

Next webinar: Thursday March 28th, 2024

Speaker: Tetyana Ignatova, University of North Carolina- Greensboro

Title:  MoS2 Lattice Rejuvenation Through Photon-Induced Sulfur Vacancy Passivation 

Abstract: Our study of laser irradiation of 2D TMDC samples reveals several stages of alternation of their optical and electronic properties. Upon controllable light irradiation with carefully selected laser power, MoS2 quality improves towards more pristine crystalline structure. This is manifested with increasing A exciton weight in the photoluminescence (PL) spectrum. For multilayered TMDC samples, laser irradiation results in photoinduced etching, down to the single layer thickness, as confirmed by measured separation between E2g and A1g Raman peaks. For all original sample thickness – monolayer or multilayer – PL enhancement is observed, for SiO2 and Al2O3 substrates. This suggests the internal  mechanism which is reliant on the material itself rather than an interaction with the substrate.

This work was performed in part at the JSNN, a member of the SENIC and NNCI, (NSF ECCS-1542174) and at the PSU, the 2DCC-MIP (NSF DMR-1539916, the RSVP student support and samples). The work was supported by Department of Defense [Contract W911QY2220006].

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