Preparation of Bismuth Oxide Nanoplatelets/Si Photodetector by Laser Ablation in Liquid Under Effect of an External Magnetic Field

Abstract

In this work, we have studied the effect of applying magnetic field on the properties of Bi2O3 nanoparticles and figures of merit of Bi2O3/n-Si heterojunction photodetector prepared by pulsed laser ablation in liquid (PLAL) technique. X-ray diffraction (XRD) results confirmed that the synthesized nanoparticles are polycrystalline in nature with α-Bi2O3 with monoclinic phase. Scanning electron microscope (SEM) revealed the formation of spherical nanoparticles for nanoparticles prepared without magnetic field with an average size of 24 nm, while the nanoparticles synthesized in the presence of magnetic field have platelets and nanoflowers morphologies. UV-Vis result showed that the optical energy gap of the nanoparticles decreased from 3.12 to 2.87 eV after applying the magnetic field during the ablation. The effect of applying the magnetic field on the figures of merit of the Bi2O3/n-Si photodetector was investigated. The responsivity of Bi2O3/n-Si heterojunction photodetectors increased from 0.3 to 0.9A/W at 660 nm after applying the magnetic field during the ablation.