Preparation of Bismuth Oxide Nanoplatelets/Si Photodetector by Laser Ablation in Liquid Under Effect of an External Magn
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ORIGINAL PAPER
Preparation of Bismuth Oxide Nanoplatelets/Si Photodetector by Laser Ablation in Liquid Under Effect of an External Magnetic Field Suaad S. Shaker 1 & Raid A. Ismail 1
&
Duha S. Ahmed 1
Received: 14 September 2020 / Accepted: 14 October 2020 # Springer Nature B.V. 2020
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. Keywords Bi2O3 . Nanoplatelets . Laser ablation . Photodetector
1 Introduction Bismuth oxide (Bi2O3) is a semiconducting material with bandgap ranged from 2 to 3.96 eV at room temperature [1]. Depending on the preparation temperature, bismuth oxide can be found in five essential polymorphs; α- Bi2O3, β- Bi2O3, γBi2O3, δ- Bi2O3 and ε- Bi2O3 [2]. Bi2O3 nanostructure has been used for many industrial and technological applications such as optoelectronic devices, solar cells, optical coatings, fuel cells, oxygen sensors and etc. [3, 4]. It has a wide range of attractive properties, such as the ability of tuning the energy bandgap, high refractive index, high oxide ionic conductivity at high temperature, and high permittivity. Many methods were used to prepare nanostructured Bi2O3, for example, sol-gel [5], microwave-assisted hydrothermal synthesis [6] direct solidstate reaction [7], electrochemical [8], thermal decomposition of precursors [9], and laser ablation in liquid (PLAL) [10]. The morphology and size of the synthesized nanoparticles were
* Raid A. Ismail [email protected] 1
Department of Applied Science, University of Technology, Baghdad, Iraq
found to be depended on the preparation technique. PLAL has many advantages over the other techniques such as stability of the product, simple technique, production of monodispersed nanoparticles, eco-friendly, short reaction time, inexpensive, production of high purity nanoparticles, and good control on the particle size and shape through adjusting the laser parameters [11]. Extensive studies were focused on the synthesis and characterization of Bi2O3 nanoparticles (NPs). Lin et al. reported on the product
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