Preparation and Photoluminescence of Tungsten Disulfide Monolayer

Lv, Yuguang; Huang, Feng; Zhang, Luxi; Weng, Jiaxin; Zhao, Shuping; Ji, Zhenguo

doi:10.3390/coatings8060205

Cited by 10 publications

(9 citation statements)

References 24 publications

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“…A significant advantage to employing organic materials is due to their facile solution processability [17,18,19,20,21,22]. Nowadays, it remains challenging to form uniform 2D WS 2 thin films on a large scale due to the coexistence of discontinuous and isolated single layers and multilayers [23,24,25,26,27]. Due to the excellent flexibility of organic materials, the surface of the isolated 2D WS 2 layers could be effectively smoothed out and interconnected together, filling pinholes and vacancies of the 2D layers underneath.…”

Section: Introductionmentioning

confidence: 99%

A Bilayer 2D-WS2/Organic-Based Heterojunction for High-Performance Photodetectors

Huang

et al. 2019

Nanomaterials

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Two-dimensional (2D) tungsten disulfide (WS2) has inspired great efforts in optoelectronics, such as in solar cells, light-emitting diodes, and photodetectors. However, chemical vapor deposition (CVD) grown 2D WS2 domains with the coexistence of a discontinuous single layer and multilayers are still not suitable for the fabrication of photodetectors on a large scale. An emerging field in the integration of organic materials with 2D materials offers the advantages of molecular diversity and flexibility to provide an exciting aspect on high-performance device applications. Herein, we fabricated a photodetector based on a 2D-WS2/organic semiconductor materials (mixture of the (Poly-(N,N′-bis-4-butylphenyl-N,N′-bisphenyl) benzidine and Phenyl-C61-butyric acid methyl ester (Poly-TPD/PCBM)) heterojunction. The application of Poly-TPD/PCBM organic blend film enhanced light absorption, electrically connected the isolated WS2 domains, and promoted the separation of electron-hole pairs. The generated exciton could sufficiently diffuse to the interface of the WS2 and the organic blend layers for efficient charge separation, where Poly-TPD was favorable for hole carrier transport and PCBM for electron transport to their respective electrodes. We show that the photodetector exhibited high responsivity, detectivity, and an on/off ratio of 0.1 A/W, 1.1 × 1011 Jones, and 100, respectively. In addition, the photodetector showed a broad spectral response from 500 nm to 750 nm, with a peak external quantum efficiency (EQE) of 8%. Our work offers a facile solution-coating process combined with a CVD technique to prepare an inorganic/organic heterojunction photodetector with high performance on silicon substrate.

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Section: Introductionmentioning

confidence: 99%

A Bilayer 2D-WS2/Organic-Based Heterojunction for High-Performance Photodetectors

Huang

et al. 2019

Nanomaterials

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“…WS 2 : The samples were characterised by Raman spectroscopy using a 532 nm laser. As displayed in Figure 1a, the 2LA (353.1 cm -1 ) and A 1g (420.1 cm -1 ) peaks are indicative for a monolayer [34,35]. In addition, PL spectrum in Figure 1b shows an emission peak at 620.2 nm, further confirming monolayer WS 2 structure.…”

Section: Sample Characterisationmentioning

confidence: 65%

Nanotribology of transition metal dichalcogenide flakes deposited by chemical vapour deposition: The influence of chemical composition and sliding speed on nanoscale friction of monolayers

Rapuc

Wang

Polcar

2021

Applied Surface Science

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“…As displayed in Fig. 1c, the 352.4 cm −1 2LA peak and 419.6 cm −1 A 1g peak are obvious for monolayer, while a slight red shift of 2LA and a blue shift of A 1g mode were observed with the increase of layer number 30,31 . In addition, photoluminescence (PL) spectrum in Fig.…”

Section: Resultsmentioning

confidence: 81%

Triboelectrification of Two-Dimensional Chemical Vapor Deposited WS2 at Nanoscale

Wang

Huang

Polcar

2019

Sci Rep

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Triboelectric properties of chemical vapor deposited WS 2 nanoflakes have been characterized in nano-range by atomic force microscopy (AFM) and Kelvin force microscopy (KFM). The triboelectric process is dependent on the thickness of WS 2 nanoflakes, and it is sensitive to the adsorbates like water molecules, as well as transferred Pt from the tip on the sample. The density of tribo-charge can be modified by applying various biases to the conductive Pt-coated tip during the frictional process. Tunneling of the tribo-charge into the gap between WS 2 and the underlying substrate results in a long lifetime, which is about 100 times longer than conventional triboelectric charges. Moreover, we observe a positive correlation between the layer number and resistance to charge dissipation. Our finding can become the driving force for a new category of two-dimensional (2D) WS 2 triboelectrically controllable nanodevices.

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Preparation and Photoluminescence of Tungsten Disulfide Monolayer

Cited by 10 publications

References 24 publications

A Bilayer 2D-WS2/Organic-Based Heterojunction for High-Performance Photodetectors

A Bilayer 2D-WS2/Organic-Based Heterojunction for High-Performance Photodetectors

Nanotribology of transition metal dichalcogenide flakes deposited by chemical vapour deposition: The influence of chemical composition and sliding speed on nanoscale friction of monolayers

Triboelectrification of Two-Dimensional Chemical Vapor Deposited WS2 at Nanoscale

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