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Preparation of a nanostructured CdTe@CdS core–shell/Si photodetector by two-step laser ablation in liquid

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Abstract

In this study, CdTe@CdS core–shell nanoparticles (NPs) were synthesized by pulsed laser ablation in distilled water. X-ray diffraction results showed a crystalline core/shell type. UV–Vis measurements revealed that the optical band gap of CdTe@CdS NPs was 2.25 eV. Energy-dispersive X-ray map** confirmed the formation of the CdTe@CdS core/shell. Transmission electron microscope studies revealed that the core size (CdTe) is 16 nm, and the shell thickness (CdS) is around 3 nm. The photoluminescence (PL) spectrum confirms the emission of a strong and broad peak at 506 nm. The current characteristics of the n-CdTe@CdS/p-Si heterojunction exhibited rectifying behavior with an ideality factor of 4.3. The spectral operating region of the fabricated photodetector ranged from visible to near-infrared, with a maximum responsivity of 0.901 A/W at 810 nm. The specific detectivity and external quantum efficiency of CdTe@CdS/Si were 4.5 × 1011 Jones and 1.1 × 102%, respectively, at a bias voltage of − 7.5 V.

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Authors and Affiliations

  1. Department of Physics, College of Science, University of Diyala, Diyala, Iraq

    Yamamah K. Abdalaah & Olfat Ahmed Mahmood

  2. Department of Applied Science, University of Technology, Baghdad, Iraq

    Suaad S. Shaker & Raid A. Ismail

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  1. Yamamah K. Abdalaah
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  2. Olfat Ahmed Mahmood
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Abdalaah, Y.K., Mahmood, O.A., Shaker, S.S. et al. Preparation of a nanostructured CdTe@CdS core–shell/Si photodetector by two-step laser ablation in liquid. J Opt (2024). https://doi.org/10.1007/s12596-024-01720-5

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