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Preparation of high-responsivity strontium–doped CuO/Si heterojunction photodetector by spray pyrolysis

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Abstract

In this work, the fabrication and characterization of a strontium-doped CuO/Si photodetector by chemical spray pyrolysis are demonstrated. The structural, electrical, and optical properties of CuO film and strontium-doped CuO film doped at doping concentrations of 3% and 6% are studied. The X-ray diffraction studies reveal that the deposited CuO film is crystalline with a monoclinic structure, and a new Cu4O3 phase was observed when the film was doped with strontium. The optical energy gap decreases from 2.5 to 2.25 eV after doping with Sr at 6%. The scanning electron microscopy investigation shows that the grain size decreases from 150 to 75 nm after doping with 6% strontium. The DC electrical conductivity of the film decreased after doping, and the activation energy was determined and found to be 0.52 and 0.75 eV for Sr dopant at 3% and 6%, respectively. The current–voltage characteristics of CuO/Si and CuO:Sr/Si heterojunction photodetectors under dark and light conditions are studied as a function of doping concentration. The photodetectors show rectification characteristics. The figures of merit of the photodetectors are measured. The responsivity (Rλ) of the photodetectors increases from 0.9 to 1.7 and 2.85 A/W at 650 nm after doping with strontium at doping concentrations of 3 and 6%, respectively. The maximum external quantum efficiency (EQE) and specific detectivity (D*) were 2.79 × 102% and 2.66 × 1012 Jones, respectively, for a CuO:Sr/Si photodetector doped with 3%.

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Acknowledgements

The authors would like to thank the department of Applied Sciences, University of Technology–Iraq for their logistic support.

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Authors and Affiliations

  1. Department of Applied Sciences, University of Technology, Baghdad, Iraq

    Mustafa A. Hassan, Mayyadah H. Mohsin & Raid A. Ismail

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  1. Mustafa A. Hassan
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  2. Mayyadah H. Mohsin
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  3. Raid A. Ismail
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Contributions

RAI and MAH conceived the presented idea. RAI and MAH supervised the finding of this work. MAH and RAI discussed the results and contributed equally to the final manuscript. MAH, MHM, and RAI conducted the experiments. RAI and MHM provided critical feedback and helped shape the research, analysis, and manuscript.

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Correspondence to Raid A. Ismail.

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Hassan, M.A., Mohsin, M.H. & Ismail, R.A. Preparation of high-responsivity strontium–doped CuO/Si heterojunction photodetector by spray pyrolysis. J Mater Sci: Mater Electron 34, 912 (2023). https://doi.org/10.1007/s10854-023-10348-3

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