Paper 14037-61
Paper 14037-61
Impact of exfoliation parameters on the structural characteristics of 2D WSe2-based detectors
On demand | Presented live 28 April 2026 
Abstract
Two-dimensional transition metal dichalcogenides (TMDs) such as WSe2 are promising for optoelectronic photodetectors due to their thinness, tunable properties, and flexibility. This study examines how exfoliation parameters - peeling angle, substrate contact, and thermal treatment - impact flake quality and device performance. Optimized techniques produced continuous layers and reproducible visible-near‑infrared (VIS-NIR) photodetectors with ohmic contacts and photoconductive operation. The electrical response followed Arrhenius behaviour, with activation energies depending on device geometry. Narrowing the conduction channels increased resistance while reducing dark current and noise, underscoring the importance of device layout and fabrication processes in achieving efficient VIS-NIR detection with TMDs.
Presenter
Ewa Wierzbicka
Wojskowa Akademia Techniczna im. Jaroslawa Dabrowskiego (Poland)
Dr. Ewa Wierzbicka earned her Ph.D. in chemical sciences from the Jagiellonian University in Kraków, Poland, in 2016. From 2017 to 2018, she pursued a postdoctoral fellowship at the Complutense University of Madrid, Spain, as part of the international ALMAGIC project funded under the Clean Sky 2 program, Horizon 2020. She subsequently held a research position at Friedrich-Alexander University Erlangen-Nürnberg (FAU) in Germany (2018–2019). Between 2019 and 2022, she was awarded a research fellowship by the Alexander von Humboldt Foundation, which she carried out at FAU and Humboldt University of Berlin. From 2022 to 2025, she led NCN and NAWA “Polish Returns” projects at the Faculty of New Technologies and Chemistry, Military University of Technology. She currently holds the position of assistant professor at the Department of Solid State Physics, WAT. Dr. Wierzbicka is a recipient of the Polish Minister of Education and Science scholarship for outstanding young researchers.
Also in the session