FWI Seminar: Engineering point and extended defects in 2D transition metal dichalcogenides

Datum

25.07.2023

Zeit

10:00 - 11:00

Sprecher

Prof. Hannu-Pekka Komsa

Zugehörigkeit

Univesity of Oulu, Finland

Sprache

en

Hauptthema

Physik

Host

Dr. A. Krasheninnikov

Beschreibung

Two-dimensional (2D) materials such as graphene, hexagonal boron nitride, and transition metal dichalcogenides have recently received lots of attention due to their unique material properties and numerous potential applications. The 2D atomic structure can also facilitate distinct defect formation mechanisms and offer new possibilities for defect engineering. In my talk, I will present the results from layered molybdenum dichalcogenides (MoS2, WSe2, etc.), where vacancy, substitutional, interstitial, and grain boundary defects are introduced by electron irradiation or by various chemical treatments. Due to the 2D nature, the defect formation and properties can be characterized using transmission electron microscopy and scanning tunneling microscopy. First-principles calculations are used to provide microscopic insight into the energetics and kinetics of these processes. The gained understanding together with the computationally predicted defect properties can be used to guide future efforts in tailoring the 2D material properties via defect engineering.

Letztmalig verändert: 25.07.2023, 07:37:02