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Study Effect of Magnetic Field on Au-TiO2 Core–Shell Nanoparticles via Laser Ablation Deposited on Porous Silicon for Photodetector

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Abstract

Gold-titanium dioxide nanoparticles (Au-TiO2 NPs) were synthesized via pulsed Nd:YAG laser ablation in the CTAB under the influence of an external magnetic field produced. Scanning electron microscopy (SEM), X-ray diffraction (XRD), UV–Vis spectroscopy, and transmission electron microscopy (TEM) have been utilized in order to analyze Au-TiO2 NPs. The XRD pattern related to Au-TiO2 NPs indicated that they have been polycrystalline and the specimens Au-TiO2 were nanocrystalline. In the case when applying a magnetic field, spherical NPs are generated, particle agglomeration is reduced, and particle size declines from 31 to 25 nm, according to SEM. Following ablation with a magnetic field, the optical energy gap of Au-TiO2 NPs increased from 3.5 to 3.7 eV. With current density–voltage (J-V) measurements, the electrical parameters of Al/Au-TiO2/PS/Si/Al heterojunction, including the barrier height (ΦB) and ideal factor (n), were indicated. The efficiency regarding Au-TiO2/PS photodetectors has been enhanced over various wavelengths, quantum efficiency (QE) of Au-TiO2/PS photodetectors has been reduced after adding a magnetic field during the process of ablation.

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Acknowledgements

The authors would like to thank the University of Technology-Iraq for the logistic support of this work.

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Authors and Affiliations

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

    Ahmad J. Jwar & Uday M. Nayef

  2. College of Science, University of Baghdad, Baghdad, Iraq

    Falah A.-H. Mutlak

Authors
  1. Ahmad J. Jwar
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  2. Uday M. Nayef
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  3. Falah A.-H. Mutlak
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Contributions

Uday Nayef and Falah Mutlak conceived and supervised the study and designed the experiments. Ahmad Jwar carried out the XRD, SEM, and the absorption measurements. Uday Nayef fabricated the PS and hybrid Au-TiO2 NPs/PS layers acquired the electrical characterization and spectral responsivity. Uday Nayef drafted the initial version of the manuscript. All the authors commented on the results, provided ideas for the study, and reviewed the manuscript.

Corresponding author

Correspondence to Uday M. Nayef.

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Jwar, A.J., Nayef, U.M. & Mutlak, F.AH. Study Effect of Magnetic Field on Au-TiO2 Core–Shell Nanoparticles via Laser Ablation Deposited on Porous Silicon for Photodetector. Plasmonics 18, 595–605 (2023). https://doi.org/10.1007/s11468-023-01791-3

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