Article Monolayer WS2 electro- and photo-luminescence enhancement by TFSI treatment

A R Cadore ; B L T Rosa ; I Paradisanos ; S Mignuzzi ; D De Fazio ; E M Alexeev ; A Dagkli ; J E Muench ; G Kakavelakis ; S M Shinde ; D Yoon ; S Tongay ; K Watanabe SAMURAI ORCID (National Institute for Materials Science) ; T Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; E Lidorikis ; I Goykhman ; G Soavi ; A C Ferrari

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A R Cadore, B L T Rosa, I Paradisanos, S Mignuzzi, D De Fazio, E M Alexeev, A Dagkli, J E Muench, G Kakavelakis, S M Shinde, D Yoon, S Tongay, K Watanabe, T Taniguchi, E Lidorikis, I Goykhman, G Soavi, A C Ferrari. Monolayer WS2 electro- and photo-luminescence enhancement by TFSI treatment. 2D Materials. 2024, 11 (2), 025017. https://doi.org/10.1088/2053-1583/ad1a6a
SAMURAI

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(abstract)

Layered material heterostructures (LMHs) can be used to fabricate electroluminescent devices op- erating in the visible spectral region. A major advantage of LMH-light emitting diodes (LEDs) is that electroluminescence (EL) emission can be tuned across that of different exciton complexes (e.g. biex- citons, trions, quintons) by controlling the charge density. However, these devices have an EL quan- tum efficiency as low as∼10−4%. Here, we show that the superacid bis-(triuoromethane)sulfonimide (TFSI) treatment of monolayer WS2-LEDs boosts EL quantum efficiency by over one order of magnitude at room temperature. Non-treated devices emit light mainly from negatively charged ex- citons, while the emission in treated ones predominantly involves radiative recombination of neutral excitons. This paves the way to tunable and efficient LMH-LEDs.

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Keyword: Layered material heterostructures, electroluminescent devices, quantum efficiency

Date published: 2024-04-01

Publisher: IOP Publishing

Journal:

  • 2D Materials (ISSN: 20531583) vol. 11 issue. 2 025017

Funding:

  • ERC Hetero2D
  • EU
  • EP EP/K017144/1
  • EPSRC

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1088/2053-1583/ad1a6a

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Updated at: 2025-02-14 12:30:37 +0900

Published on MDR: 2025-02-14 12:30:38 +0900

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