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Photosensitivity properties of Eu-doped SnS2 thin films deposited by cost-effective nebulizer spray pyrolysis technique

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Abstract

The current research explores the outcome of europium doping on the structure, morphology, electrical conductivity and optoelectronic characteristics of SnS2 thin films deposited on glass substrates by nebulizer spray technique. X-ray diffraction analysis substantiates the presence of hexagonal structure in both pure and Eu-doped SnS2 thin films with the highly preferred orientation diffracted from the plane (002). It shows the intensity of the predominant peak is highest for 2% Eu-doped SnS2 thin film. From the XRD data, the crystallite size was found to be highest for 2% SnS2:Eu, and same sample showed a less dislocation density of 0.97 × 1015 lines/m2 and microstrain of 0.081 × 10–3/lines2 m4. The crystallite size first increases with increasing doping concentration of Eu (0–2%), then decreases for higher concentrations. The SEM and AFM micro images reveal the agglomeration of grains at higher Eu concentration. The compositional analysis through EDAX studies supports the presence of Eu, Sn and S. The SnS2 optical band gap value is found to vary from 2.70 to 2.91 eV as the Eu doping is increased from 2 to 6%. All the SnS2 thin film samples manifest a n-type conductivity as authenticated from Hall studies and a low resistivity of 4.34 × 10−1 cm with an elevated carrier concentration of 5.43 × 1017 cm−3, respectively, was observed for SnS2:Eu (2 wt%). The same sample established a higher responsivity (41.64 × 10−3 AW−1), competent external quantum efficiency (97.24%), and a better detectivity (40.88 × 108 Jones). Hence, the 2% Eu-doped SnS2 film is recognized to be best suited for the fabrication of high-speed optoelectronic devices. This paper also discusses a putative mechanism for photo-detector performance under air and UV radiation.

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Acknowledgements

The authors from KKU express their appreciation to the Deanship of Scientific Research at King Khalid University, for funding this work through the research groups program under Deanship of Scientific Research, King Saud University, Grant number R.G.P.2/112/41.

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Authors and Affiliations

  1. St. Joseph College of Arts and Science, Vaikalipatti, Tirunelveli, 627808, India

    A. M. S. Arulanantham

  2. Department of Physics, Pondicherry University, Pondicherry, 605014, India

    P. Mohan Raj

  3. Thin Film Research Centre, Kongu Engineering College, Perundurai, 638060, India

    K. V. Gunavathy

  4. Department of Physics, School of Science and Humanities, Vel Tech Rangarajan Dr.Sagunthala R&D Institute of Science and Technology, Avadi, Chennai, 600062, India

    M. Rigana Begam

  5. Advanced Functional Materials and Optoelectronic Laboratory (AFMOL), Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, Saudi Arabia

    V. Ganesh & H. Algarni

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Arulanantham, A.M.S., Raj, P.M., Gunavathy, K.V. et al. Photosensitivity properties of Eu-doped SnS2 thin films deposited by cost-effective nebulizer spray pyrolysis technique. Appl. Phys. A 128, 364 (2022). https://doi.org/10.1007/s00339-022-05491-3

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