Effects of solvents and polymer on photoluminescence of transferred WS2 monolayers

Wang, Xiaotian; Kang, Kyungnam; Godin, Kyle; Fu, Shichen; Chen, Siwei; Yang, Eui–Hyeok

doi:10.1116/1.5094543

Cited by 14 publications

(16 citation statements)

References 40 publications

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“…It should be noted, however, that the various effects will be of differing importance depending on the application. For example, polymer residue does not have a large influence over the PL signal of 2D TMDs [175]. Thus, for optical applications such issues can usually be ignored.…”

Section: The Impact Of Transfer Techniques On Film Qualitymentioning

confidence: 99%

“…For example, polymer residue does not have a large influence over the photoluminescence signal of 2D TMDs. [119] Thus, for optical applications such issues can usually be ignored. In the ideal case, a perfect transfer entails the functional continuity of the 2D film before and after transfer, with the only difference being the substrate.…”

Section: The Impact Of Transfer Techniques On Film Qualitymentioning

confidence: 99%

See 1 more Smart Citation

Transfer of large-scale two-dimensional semiconductors: challenges and developments

Watson¹,

Lu²,

Guimarães³

et al. 2021

2D Mater.

126

103

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Two-dimensional (2D) materials offer opportunities to explore both fundamental science and applications in the limit of atomic thickness. Beyond the prototypical case of graphene, other 2D materials have recently come to the fore. Of particular technological interest are 2D semiconductors, of which the family of materials known as the group-VI transition metal dichalcogenides (TMDs) has attracted much attention. The presence of a bandgap allows for the fabrication of high on-off ratio transistors and optoelectronic devices, as well as valley/spin polarized transport. The technique of chemical vapor deposition (CVD) has produced high-quality and contiguous wafer-scale 2D films, however, they often need to be transferred to arbitrary substrates for further investigation. In this review, the various transfer techniques developed for transferring 2D films will be outlined and compared, with particular emphasis given to CVD-grown TMDs. Each technique suffers undesirable process-related drawbacks such as bubbles, residue or wrinkles, which can degrade device performance by for instance reducing electron mobility. This review aims to address these problems and provide a systematic overview of key methods to characterize and improve the quality of the transferred films and heterostructures. With the maturing technological status of CVD-grown 2D materials, a robust transfer toolbox is vital.

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Section: The Impact Of Transfer Techniques On Film Qualitymentioning

confidence: 99%

Section: The Impact Of Transfer Techniques On Film Qualitymentioning

confidence: 99%

Transfer of large-scale two-dimensional semiconductors: challenges and developments

Watson¹,

Lu²,

Guimarães³

et al. 2021

2D Mater.

126

103

View full text Add to dashboard Cite

show abstract

“…MoS 2 patterns are then transferred to the transparent glass substrate (Fig. 2c ) via a wet transfer method 43 for optical characterizations. The Raman spectra (Fig.…”

Section: Resultsmentioning

confidence: 99%

Transition metal dichalcogenide metaphotonic and self-coupled polaritonic platform grown by chemical vapor deposition

et al. 2022

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Transition metal dichalcogenides (TMDCs) have recently attracted growing attention in the fields of dielectric nanophotonics because of their high refractive index and excitonic resonances. Despite the recent realizations of Mie resonances by patterning exfoliated TMDC flakes, it is still challenging to achieve large-scale TMDC-based photonic structures with a controllable thickness. Here, we report a bulk MoS2 metaphotonic platform realized by a chemical vapor deposition (CVD) bottom-up method, supporting both pronounced dielectric optical modes and self-coupled polaritons. Magnetic surface lattice resonances (M-SLRs) and their energy-momentum dispersions are demonstrated in 1D MoS2 gratings. Anticrossing behaviors with Rabi splitting up to 170 meV are observed when the M-SLRs are hybridized with the excitons in multilayer MoS2. In addition, distinct Mie modes and anapole-exciton polaritons are also experimentally demonstrated in 2D MoS2 disk arrays. We believe that the CVD bottom-up method would open up many possibilities to achieve large-scale TMDC-based photonic devices and enrich the toolbox of engineering exciton-photon interactions in TMDCs.

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“…For example, carrier mobilities of monolayer MoS 2 field-effect transistors (FETs) have been measured in the range of 0.5–150 cm 2 /Vs, − and the theoretically calculated value of 400 cm 2 /Vs has still not yet been achieved . A similar variability is seen for other properties, such as photoluminescence, which is strongly governed by the surface chemistry. , Therefore, a major challenge is the preservation of the pristine surface of 2D materials, to ensure reproducible experiments and durable devices in typical environmental conditions. Due to the high surface to volume ratio, adsorbance of molecules can result in alteration of the materials’ intrinsic properties. , This becomes increasingly problematic with each additional processing step or simply storage, regardless if carried out on a laboratory or industrial scale, which involves being in the vicinity of polymers.…”

Section: Introductionmentioning

confidence: 99%

Identification of Ubiquitously Present Polymeric Adlayers on 2D Transition Metal Dichalcogenides

et al. 2023

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The interest in 2D materials continues to grow across numerous scientific disciplines as compounds with unique electrical, optical, chemical, and thermal characteristics are being discovered. All these properties are governed by an all-surface nature and nanoscale confinement, which can easily be altered by extrinsic influences, such as defects, dopants or strain, adsorbed molecules, and contaminants. Here, we report on the ubiquitous presence of polymeric adlayers on top of layered transition metal dichalcogenides (TMDs). The atomically thin layers, not evident from common analytic methods, such as Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), or scanning electron microscopy (SEM), could be identified with highly resolved time-of-flight secondary ion mass spectrometry (TOF-SIMS). The layers consist of hydrocarbons, which preferentially adsorb to the hydrophobic van der Waals surfaces of TMDs, derived from the most common methods. Fingerprint fragmentation patterns enable us to identify certain polymers and link them to those used during preparation and storage of the TMDs. The ubiquitous presence of polymeric films on 2D materials has wide reaching implications for their investigation, processing, and applications. In this regard, we reveal the nature of polymeric residues after commonly used transfer procedures on MoS 2 films and investigate several annealing procedures for their removal.

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Effects of solvents and polymer on photoluminescence of transferred WS2 monolayers

Cited by 14 publications

References 40 publications

Transfer of large-scale two-dimensional semiconductors: challenges and developments

Transfer of large-scale two-dimensional semiconductors: challenges and developments

Transition metal dichalcogenide metaphotonic and self-coupled polaritonic platform grown by chemical vapor deposition

Identification of Ubiquitously Present Polymeric Adlayers on 2D Transition Metal Dichalcogenides

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