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Liquid-phase exfoliation of WSe2 nanosheets for ITO/WSe2 photodetector

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Abstract

The potential application of atomically thin two-dimensional (2D)-layered WSe2 in future wearable electronics has sparked a lot of interest. Herein, we report the highly crystalline nature of WSe2 nanosheets was synthesized by the liquid-phase exfoliation technique and its application as a broadband photodetector. The direct vapor transport (DVT) technique has been used in the synthesis of bulk WSe2 compounds. The chemical composition and purity of the grown compound were investigated by EDAX (Energy-dispersive analysis of X-ray). The structural phase analysis and the crystalline orientation were examined by X-ray diffraction technique (XRD), Scanning electron microscopy (SEM), and High-resolution transmission electron microscopy (HR-TEM) of the synthesized WSe2 compound. The Raman spectrum depicts the resonances corresponding to the E2g mode of vibration of WSe2 nanosheets. Additionally, a broadband photodetector based on WSe2 nanosheets was constructed and evaluated under wavelength-dependent illumination sources with a power level of 40 mW/cm2 on a 1.0 bias voltage. The ITO/WSe2 nanosheet device was studied under the function of various power intensities and various external bias voltages. The device is tested for bias between 0 and 30 V and its responsiveness is improved. Furthermore, the device demonstrated higher stability under 40 mW/cm2 intensity. The results showed that WSe2 nanosheets have good optoelectronic capabilities and can be used in future optoelectronic devices.

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Fig. 1
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source illumination with 40 mw/cm2 power intensity, b pulse photoresponse of a device under pink (polychromatic) source illumination as a function of various power intensities, and c pulse photoresponse of device under pink (polychromatic) source illumination as a function of various external bias voltages. d Stability curve at 1.0 V and 40 mW/cm2 power intensity

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Data availability

The datasets generated during and analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

Badal Chauhan would like to express their gratitude to the University Grants Commission of India (UGC) for providing a National fellowship under the OBC scheme. (NFO-2018-19- OBC-GUJ-71826).

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Authors and Affiliations

  1. Department of Physics, Sardar Patel University, Vallabh Vidyanagar, Anand, 388120, Gujarat, India

    Badal L. Chauhan, Sanjay A. Bhakhar, Shubham U. Gupta, G. K. Solanki & V. M. Pathak

  2. Department of Physical Science, P.D. Patel Institute of Applied Sciences, Charorat University of Science and Technology, CHARUSAT, Changa, Gujarat, 388421, India

    Pratik M. Pataniya

  3. Sophisticated Instruments Centre for Applied Research and Testing-SICART, Vallabh Vidyanagar, Gujarat, 388120, India

    Vikas Patel

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  1. Badal L. Chauhan
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  2. Sanjay A. Bhakhar
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  3. Pratik M. Pataniya
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  4. Shubham U. Gupta
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  5. G. K. Solanki
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Contributions

BLC participated in the conceptualization, material preparation, data collection, investigation, analysis, and writing of the original draft. SAB participated in the investigation, data analysis, and methodology. SUG participated in the investigation and methodology. PMP participated in the data analysis and writing, reviewing, and editing of the manuscript. GKS acquired resources and assisted in project administration, writing, reviewing, and editing of the manuscript, and supervision. VMP assisted in project administration. VP acquired resources.

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Correspondence to Badal L. Chauhan or G. K. Solanki.

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Chauhan, B.L., Bhakhar, S.A., Pataniya, P.M. et al. Liquid-phase exfoliation of WSe2 nanosheets for ITO/WSe2 photodetector. J Mater Sci: Mater Electron 33, 10314–10322 (2022). https://doi.org/10.1007/s10854-022-08019-w

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