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Tuning the optoelectronic properties of n-CdO:Fe/p-Si photodiodes fabricated by facile perfume atomizer technique for photo-detector applications

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Abstract

In this work, a facile spray-assisted perfume atomizer technique was used to prepare CdO and Fe-doped CdO (CdO:Fe) thin films with varying concentrations of Fe (1, 3, and 5 wt%). The deposited films were characterized using different analytical techniques to realize the structural, morphological, optical, electrical, and photosensing properties. From X-ray diffraction (XRD) results, the CdO and CdO:Fe thin films have a cubic structure and an increase in crystallite size was observed for the CdO:Fe(3%) sample. The optical studies of the doped samples reveal a high absorption in the observed wavelength range and a decrease in optical bandgap values. The CdO:Fe(3%) sample exhibits a minimum resistivity value (4.02 × 10–3 Ωcm), high carrier concentration (22.92 × 1019 cm−3), and high mobility (6.78 cmV−1 s−1). The current–voltage characteristics suggest that the CdO:Fe(3%) sample has a lower ideality factor of 4.2, high photocurrent value of 1.62 × 10–2 A. It also has better photosensing parameter values such as responsivity of 0.15AW−1, the external quantum efficiency of 2.92 × 108 Jones, and detectivity of 50%, which are due to the synergistic effect of increased crystallite size, high light absorption, optimum bandgap, and better electrical properties of the CdO:Fe(3%) sample.

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Acknowledgements

The authors Tansir Ahamad and Saad M Alshehri thank to Researchers Supporting Project number (RSP-2020/29), King Saud University, Riyadh, Saudi Arabia.

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Authors and Affiliations

  1. PG and Research Department of Physics, Alagappa Govt Arts College, Karaikudi, 630003, India

    M. Rajini, M. Karunakaran & K. Kasirajan

  2. Department of Electronics and Communication Engineering, Manakula Vinayagar Institute of Technology, Kalitheerthalkuppam, Puducherry, 605 107, India

    S. Vinoth

  3. Department of Physics, Institute of Aeronautical Engineering, Dundigal, Hyderabad, 500043, India

    K. Hariprasad

  4. Department of Physics, Rajah Serfoji Government College (Autonomous), Thanjavur, Tamil Nadu, 613 005, India

    N. Chidhambaram

  5. Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia

    Tansir Ahamad & Saad M. Alshehri

  6. School of Science and Technology, Glocal University, Saharanpur, India

    Tansir Ahamad

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Rajini, M., Vinoth, S., Hariprasad, K. et al. Tuning the optoelectronic properties of n-CdO:Fe/p-Si photodiodes fabricated by facile perfume atomizer technique for photo-detector applications. Appl. Phys. B 127, 109 (2021). https://doi.org/10.1007/s00340-021-07658-x

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