Gratulujemy prof. Łukaszowi Gelczukowi oraz innym współautorom opublikowania pracy "Experimental and theoretical studies of native deep-level defects in transition metal dichalcogenides" wydanej w czasopiśmie Nature npj 2D Materials and Applications (IF=11.44). Wszystkim życzymy dalszych sukcesów naukowych.

Experimental and theoretical studies of native deep-level defects in transition metal dichalcogenides

Jun Young Kim, Łukasz Gelczuk, Maciej P. Polak, Daria Hlushchenko, Dane Morgan, Robert Kudrawiec and Izabela Szlufarska

Transition metal dichalcogenides (TMDs), especially in two-dimensional (2D) form, exhibit many properties desirable for device applications. However, device performance can be hindered by the presence of defects. Here, we combine state of the art experimental and computational approaches to determine formation energies and charge transition levels of defects in bulk and 2D MX2 (M = Mo or W; X = S, Se, or Te). We perform deep level transient spectroscopy (DLTS) measurements of bulk TMDs. Simultaneously, we calculate formation energies and defect levels of all native point defects, which enable identification of levels observed in DLTS and extend our calculations to vacancies in 2D TMDs, for which DLTS is challenging. We find that reduction of dimensionality of TMDs to 2D has a significant impact on defect properties. This finding may explain differences in optical properties of 2D TMDs synthesized with different methods and lays foundation for future developments of more efficient TMD-based devices.

npj 2D Materials and Applications (2022) 6:75 ; https://doi.org/10.1038/s41699-022-00350-4