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

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 (phi(B)) 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.