Synchronized Photoluminescence and Electrical Mobility Enhancement in 2D WS 2 through Sequence-Specific Chemical Passivation.

Autor: Li Z; Solid State Physics, Department of Materials Science and Engineering, Uppsala University, 75103 Uppsala, Sweden.; X-ray Photon Science, Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, Sweden.; Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, U.K., Nameirakpam H; X-ray Photon Science, Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, Sweden., Berggren E; X-ray Photon Science, Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, Sweden., Noumbe U; X-ray Photon Science, Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, Sweden., Kimura T; Department of Materials Science, Tohoku University, Sendai 980-8579, Japan., Asakura E; Department of Materials Science, Tohoku University, Sendai 980-8579, Japan., Gray V; Physical Chemistry, Department of Chemistry-Ångström Laboratory, Uppsala University, 75120 Uppsala, Sweden., Thakur D; Solid State Physics, Department of Materials Science and Engineering, Uppsala University, 75103 Uppsala, Sweden., Edvinsson T; Solid State Physics, Department of Materials Science and Engineering, Uppsala University, 75103 Uppsala, Sweden., Lindblad A; X-ray Photon Science, Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, Sweden., Kohda M; Department of Materials Science, Tohoku University, Sendai 980-8579, Japan., Araujo RB; Solid State Physics, Department of Materials Science and Engineering, Uppsala University, 75103 Uppsala, Sweden., Rao A; Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, U.K., Kamalakar MV; X-ray Photon Science, Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, Sweden.
Jazyk: angličtina
Zdroj: Journal of the American Chemical Society [J Am Chem Soc] 2024 Dec 25; Vol. 146 (51), pp. 35146-35154. Date of Electronic Publication: 2024 Dec 11.
DOI: 10.1021/jacs.4c11052
Abstrakt: Two-dimensional (2D) semiconducting dichalcogenides hold exceptional promise for next-generation electronic and photonic devices. Despite this potential, the pervasive presence of defects in 2D dichalcogenides results in carrier mobility and photoluminescence (PL) that fall significantly short of theoretical predictions. Although defect passivation offers a potential solution, its effects have been inconsistent. This arises from the lack of chemical understanding of the surface chemistry of the 2D material. In this work, we uncover new binding chemistry using a sequence-specific chemical passivation (SSCP) protocol based on 2-furanmethanothiol (FSH) and bis(trifluoromethane) sulfonimide lithium salt (Li-TFSI), which demonstrates a synchronized 100-fold enhancement in both carrier mobility and PL in WS 2 monolayers. We propose an atomic-level synergistic defect passivation mechanism of both neutral and charged sulfur vacancies (SVs), supported by ultrafast transient absorption spectroscopy (TA), Hard X-ray photoelectron spectroscopy (HAXPES), and density functional theory (DFT) calculations. Our results establish a new semiconductor quality benchmark for 2D WS 2 , paving the way for the development of sustainable 2D semiconductor technologies.
Databáze: MEDLINE
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