Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 36: Poster III

HL 36.27: Poster

Mittwoch, 20. März 2024, 18:00–20:30, Poster E

Interlayer excitons engineering in Transition Metal Dichalcogenides Heterobilayer — •Ridha Eddhib, Aki Pulkkinen, and Jan Minar — New Technologies - Research Centre, University of West Bohemia, 301 00 Pilsen, Czech Republic.

Our study is aimed to showcase the feasibility of manipulating the optical characteristics of transition metal dichalcogenide Heterostructures (TMD-HS) beyond the intralayer excitons[1-2], particularly when one of the constituent layers adopts a ternary structure which is an intriguing class of HS known as type II band alignment. This manipulation bears crucial implications for enhancing charge separation efficiency, as optically excited electrons and holes undergo relaxation into distinct material layers giving rise to interlayer excitons. In the realm of binary-ternary (B-T) HS systems, we have investigated the exciting avenue for extending the energy range and tailoring emission energies, surpassing the capabilities of their (B-B) and free standing counterparts. Our findings underscore the significance of the alloying ratio in fine-tuning excitons binding energy, and also highlighting the importance in the band offset in the emergence of this optical feature thereby introducing a novel design parameter for tailoring optoelectronic devices to specific applications. [1] Hichri, A., T. Amand, and S. Jaziri. Physical Review Materials 5.11 (2021): 114002. [2]Aly, M. A., Enakerakpor, E. O., Koch, M., & Masenda, H. (2023). Nanomaterials, 13(20), 2769.

Keywords: Excitons; 2D materials; Heterostructure; Alloys; DFT