Long lived photogenerated charge carriers in few-layer transition metal dichalcogenides obtained from liquid phase exfoliation

Morabito, Floriana; Synnatschke, Kevin; Mehew, Jake Dudley; Varghese, Sebin; Sayers, Charles James; Folpini, Giulia; Petrozza, Annamaria; Cerullo, Giulio; Tielrooij, Klaas-Jan; Coleman, Jonathan; Nicolosi, Valeria; Gadermaier, Christoph

doi:10.1039/d3na00862b

Cited by 4 publications

(1 citation statement)

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“…Monolayer TMDs, for instance, emerge as an effective material for quantum computers, optoelectronics, and nanoelectronics due to their direct bandgap. − However, in contrast to their monolayer counterparts, few-layer TMDs maintain flexibility due to the presence of interlayer or van der Waals (vdW) interaction among different layers, while providing slightly increased structural robustness. Few-layer TMDs thus can be used in flexible and wearable electronics, space technology, electrocatalysis, energy storage, and gas sensing devices. − Comprehending interlayer interactions is essential for designing advanced materials as they are linked to interfacial structure and functionality on an atomic scale. The interlayer interaction between distinct layers of TMDs is currently a fascinating focus of fundamental and application-oriented research.…”

Section: Introductionmentioning

confidence: 99%

Interlayer Vibronic Interactions and Phonon Anharmonic Decay in Few-Layer WS₂ Nanoflakes

Ghanghass,

Rani,

Sameera

et al. 2024

J. Phys. Chem. C

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Temperature-dependent (TD) Raman spectroscopy has been utilized to probe the phonon anharmonicity in few-layer WS2, focusing on interlayer interactions and Davydov splitting under resonance excitation. In this study, spectroscopic measurements were conducted across a wide temperature range of 200–600 K using a laser with an excitation wavelength of 633 nm. The splitting in the out-of-plane A 1g mode due to weak interlayer interactions in few-layer WS2 was observed to be prominent at low temperatures. The first-order temperature coefficients corresponding to the peak positions of E 2 normalg 1 and A 1g modes indicate the softening of Raman modes with an increase in temperature. The quantification of quasi-harmonic and anharmonic contributions to phonon mode softening has been primarily identified by using thermodynamic relations. Furthermore, a semi-quantitative model has been employed to investigate the TD frequency shift and peak width of E 2 normalg 1 and A 1g modes, demonstrating the importance of three- and four- phonon anharmonicities.

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Section: Introductionmentioning

confidence: 99%

Interlayer Vibronic Interactions and Phonon Anharmonic Decay in Few-Layer WS₂ Nanoflakes

Ghanghass,

Rani,

Sameera

et al. 2024

J. Phys. Chem. C

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Advancements in 2D transition metal dichalcogenides (TMDs) inks for printed optoelectronics: A comprehensive review

Shahbaz,

Tahir,

et al. 2024

Materials Today

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Toward Mass Production of Transition Metal Dichalcogenide Solar Cells: Scalable Growth of Photovoltaic-Grade Multilayer WSe₂ by Tungsten Selenization

Neilson,

Hamtaei,

Nassiri Nazif

et al. 2024

ACS Nano

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Semiconducting transition metal dichalcogenides (TMDs) are promising for high-specific-power photovoltaics due to their desirable band gaps, high absorption coefficients, and ideally dangling-bond-free surfaces. Despite their potential, the majority of TMD solar cells to date are fabricated in a nonscalable fashion, with exfoliated materials, due to the lack of high-quality, large-area, multilayer TMDs. Here, we present the scalable, thickness-tunable synthesis of multilayer WSe 2 films by selenizing prepatterned tungsten with either solid-source selenium at 900 °C or H 2 Se precursors at 650 °C. Both methods yield photovoltaicgrade, wafer-scale WSe 2 films with a layered van der Waals structure and superior characteristics, including charge carrier lifetimes up to 144 ns, over 14× higher than those of any other large-area TMD films previously demonstrated. Simulations show that such carrier lifetimes correspond to ∼22% power conversion efficiency and ∼64 W g −1 specific power in a packaged solar cell, or ∼3 W g −1 in a fully packaged solar module. The results of this study could facilitate the mass production of high-efficiency multilayer WSe 2 solar cells at low cost.

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Long lived photogenerated charge carriers in few-layer transition metal dichalcogenides obtained from liquid phase exfoliation

Abstract: Liquid-phase exfoliation enables tiled nanosheet films of 2D semiconductors with exceptionally long carrier lifetime for light harvesting and sensing.

Cited by 4 publications

References 64 publications

Interlayer Vibronic Interactions and Phonon Anharmonic Decay in Few-Layer WS₂ Nanoflakes

Interlayer Vibronic Interactions and Phonon Anharmonic Decay in Few-Layer WS₂ Nanoflakes

Advancements in 2D transition metal dichalcogenides (TMDs) inks for printed optoelectronics: A comprehensive review

Toward Mass Production of Transition Metal Dichalcogenide Solar Cells: Scalable Growth of Photovoltaic-Grade Multilayer WSe₂ by Tungsten Selenization

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Long lived photogenerated charge carriers in few-layer transition metal dichalcogenides obtained from liquid phase exfoliation

Abstract: Liquid-phase exfoliation enables tiled nanosheet films of 2D semiconductors with exceptionally long carrier lifetime for light harvesting and sensing.

Cited by 4 publications

References 64 publications

Interlayer Vibronic Interactions and Phonon Anharmonic Decay in Few-Layer WS2 Nanoflakes

Interlayer Vibronic Interactions and Phonon Anharmonic Decay in Few-Layer WS2 Nanoflakes

Advancements in 2D transition metal dichalcogenides (TMDs) inks for printed optoelectronics: A comprehensive review

Toward Mass Production of Transition Metal Dichalcogenide Solar Cells: Scalable Growth of Photovoltaic-Grade Multilayer WSe2 by Tungsten Selenization

Contact Info

Product

Resources

About

Interlayer Vibronic Interactions and Phonon Anharmonic Decay in Few-Layer WS₂ Nanoflakes

Interlayer Vibronic Interactions and Phonon Anharmonic Decay in Few-Layer WS₂ Nanoflakes

Toward Mass Production of Transition Metal Dichalcogenide Solar Cells: Scalable Growth of Photovoltaic-Grade Multilayer WSe₂ by Tungsten Selenization