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; T. Taniguchi; E. Lidorikis; I. Goykhman; G. Soavi; A. C. Ferrari

doi:10.1088/2053-1583/ad1a6a

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, T. Taniguchi, E. Lidorikis, I. Goykhman, G. Soavi, A. C. Ferrari

Engineering, Ira A. Fulton Schools of (IAFSE)

Research output: Contribution to journal › Article › peer-review

Abstract

Layered material heterostructures (LMHs) can be used to fabricate electroluminescent devices operating in the visible spectral region. A major advantage of LMH-based light emitting diodes (LEDs) is that electroluminescence (EL) emission can be tuned across that of different exciton complexes (e.g. biexcitons, trions, quintons) by controlling the charge density. However, these devices have an EL quantum 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 excitons, while the emission in treated ones predominantly involves radiative recombination of neutral excitons. This paves the way to tunable and efficient LMH-based LEDs.

Original language	English (US)
Article number	025017
Journal	2D Materials
Volume	11
Issue number	2
DOIs	https://doi.org/10.1088/2053-1583/ad1a6a
State	Published - Apr 2024

Keywords

electroluminescence
layered materials heterostructures
transition metal dichalcogenides

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1088/2053-1583/ad1a6a

Cite this

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

Cadore, AR, Rosa, BLT, Paradisanos, I, Mignuzzi, S, De Fazio, D, Alexeev, EM, Dagkli, A, Muench, JE, Kakavelakis, G, Shinde, SM, Yoon, D, Tongay, S, Watanabe, K, Taniguchi, T, Lidorikis, E, Goykhman, I, Soavi, G & Ferrari, AC 2024, 'Monolayer WS₂ electro- and photo-luminescence enhancement by TFSI treatment', 2D Materials, vol. 11, no. 2, 025017. https://doi.org/10.1088/2053-1583/ad1a6a

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title = "Monolayer WS2 electro- and photo-luminescence enhancement by TFSI treatment",

abstract = "Layered material heterostructures (LMHs) can be used to fabricate electroluminescent devices operating in the visible spectral region. A major advantage of LMH-based light emitting diodes (LEDs) is that electroluminescence (EL) emission can be tuned across that of different exciton complexes (e.g. biexcitons, trions, quintons) by controlling the charge density. However, these devices have an EL quantum 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 excitons, while the emission in treated ones predominantly involves radiative recombination of neutral excitons. This paves the way to tunable and efficient LMH-based LEDs.",

keywords = "electroluminescence, layered materials heterostructures, transition metal dichalcogenides",

author = "Cadore, {A. R.} and Rosa, {B. L.T.} and I. Paradisanos and S. Mignuzzi and {De Fazio}, D. and Alexeev, {E. M.} and A. Dagkli and Muench, {J. E.} and G. Kakavelakis and Shinde, {S. M.} and D. Yoon and S. Tongay and K. Watanabe and T. Taniguchi and E. Lidorikis and I. Goykhman and G. Soavi and Ferrari, {A. C.}",

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doi = "10.1088/2053-1583/ad1a6a",

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AU - Cadore, A. R.

AU - Rosa, B. L.T.

AU - Paradisanos, I.

AU - Mignuzzi, S.

AU - De Fazio, D.

AU - Alexeev, E. M.

AU - Dagkli, A.

AU - Muench, J. E.

AU - Kakavelakis, G.

AU - Shinde, S. M.

AU - Yoon, D.

AU - Tongay, S.

AU - Watanabe, K.

AU - Taniguchi, T.

AU - Lidorikis, E.

AU - Goykhman, I.

AU - Soavi, G.

AU - Ferrari, A. C.

PY - 2024/4

Y1 - 2024/4

N2 - Layered material heterostructures (LMHs) can be used to fabricate electroluminescent devices operating in the visible spectral region. A major advantage of LMH-based light emitting diodes (LEDs) is that electroluminescence (EL) emission can be tuned across that of different exciton complexes (e.g. biexcitons, trions, quintons) by controlling the charge density. However, these devices have an EL quantum 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 excitons, while the emission in treated ones predominantly involves radiative recombination of neutral excitons. This paves the way to tunable and efficient LMH-based LEDs.

AB - Layered material heterostructures (LMHs) can be used to fabricate electroluminescent devices operating in the visible spectral region. A major advantage of LMH-based light emitting diodes (LEDs) is that electroluminescence (EL) emission can be tuned across that of different exciton complexes (e.g. biexcitons, trions, quintons) by controlling the charge density. However, these devices have an EL quantum 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 excitons, while the emission in treated ones predominantly involves radiative recombination of neutral excitons. This paves the way to tunable and efficient LMH-based LEDs.

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KW - transition metal dichalcogenides

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