Synthesis of mono- and few-layered n-type WSe 2 from solid state inorganic precursors.

Autor:	Och M; Department of Materials, Imperial College London, London, SW7 2AZ, UK. c.mattevi@imperial.ac.uk., Anastasiou K; Department of Physics and Astronomy, University of Exeter, Exeter, EX4 4QL, UK., Leontis I; Department of Physics and Astronomy, University of Exeter, Exeter, EX4 4QL, UK., Zemignani GZ; Department of Materials, Imperial College London, London, SW7 2AZ, UK. c.mattevi@imperial.ac.uk.; Center for Nano Science and Technology, Milan, Italy., Palczynski P; Department of Materials, Imperial College London, London, SW7 2AZ, UK. c.mattevi@imperial.ac.uk., Mostaed A; Department of Materials, University of Oxford, Oxford, OX1 3PH, UK., Sokolikova MS; Department of Materials, Imperial College London, London, SW7 2AZ, UK. c.mattevi@imperial.ac.uk., Alexeev EM; Department of Physics and Astronomy, University of Sheffield, Sheffield, S3 7RH, UK., Bai H; Department of Materials, Imperial College London, London, SW7 2AZ, UK. c.mattevi@imperial.ac.uk., Tartakovskii AI; Department of Physics and Astronomy, University of Sheffield, Sheffield, S3 7RH, UK., Lischner J; Department of Materials, Imperial College London, London, SW7 2AZ, UK. c.mattevi@imperial.ac.uk.; Thomas Young Centre for Theory and Simulation of Materials, Imperial College London, London, SW7 2AZ, UK., Nellist PD; Department of Materials, University of Oxford, Oxford, OX1 3PH, UK., Russo S; Department of Physics and Astronomy, University of Exeter, Exeter, EX4 4QL, UK., Mattevi C; Department of Materials, Imperial College London, London, SW7 2AZ, UK. c.mattevi@imperial.ac.uk.
Jazyk:	angličtina
Zdroj:	Nanoscale [Nanoscale] 2022 Nov 03; Vol. 14 (42), pp. 15651-15662. Date of Electronic Publication: 2022 Nov 03.
DOI:	10.1039/d2nr03233c
Abstrakt:	Tuning the charge transport properties of two-dimensional transition metal dichalcogenides (TMDs) is pivotal to their future device integration in post-silicon technologies. To date, co-doping of TMDs during growth still proves to be challenging, and the synthesis of doped WSe 2 , an otherwise ambipolar material, has been mainly limited to p-doping. Here, we demonstrate the synthesis of high-quality n-type monolayered WSe 2 flakes using a solid-state precursor for Se, zinc selenide. n-Type transport has been reported with prime electron mobilities of up to 10 cm 2 V -1 s -1 . We also demonstrate the tuneability of doping to p-type transport with hole mobilities of 50 cm 2 V -1 s -1 after annealing in air. n-Doping has been attributed to the presence of Zn adatoms on the WSe 2 flakes as revealed by X-ray photoelectron spectroscopy (XPS), spatially resolved time of flight secondary ion mass spectroscopy (SIMS) and angular dark-field scanning transmission electron microscopy (AD-STEM) characterization of WSe 2 flakes. Monolayer WSe 2 flakes exhibit a sharp photoluminescence (PL) peak at room temperature and highly uniform emission across the entire flake area, indicating a high degree of crystallinity of the material. This work provides new insight into the synthesis of TMDs with charge carrier control, to pave the way towards post-silicon electronics.
Databáze:	MEDLINE
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