Monolayer WS<sub>2</sub> 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

ジャーナル論文 Monolayer WS₂ electro- and photo-luminescence enhancement by TFSI treatment

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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

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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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