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We prepared a high-responsivity bismuth oxide Bi2O3 nanoparticles-decorated multiwalled carbon nanotubes MWCNTs/Si heterojunction photodetector by two-step laser ablation in liquid. The structural properties of the hybrid Bi2O3NPs-decorated MWCNTs were investigated by X-ray diffraction, which revealed the formation of α-Bi2O3 NPs with a monoclinic phase and graphite at the C(002) plane. Scanning electron microscopy results show the formation of spherical Bi2O3NPs attached to well-dispersed MWCNTs. The nanotubes' diameters ranged from 30 to 50 nm, their lengths from 1 to 3 m, and the average particle size of Bi2O3 NPs is 25 nm. The I–V characteristics for the Bi2O3NPs-decorated MWCNTs/Si photodetector were investigated in the dark and under illumination. The Bi2O3NPs-decorated MWCNTs/n-Si photodetectors show a responsivity of 1.37 A/W at a wavelength of 560 nm, with a corresponding external quantum efficiency of 3 × 102%. At equilibrium, band alignment for Bi2O3-MWCNTs /Si heterojunction was realized. [ABSTRACT FROM AUTHOR]

In this paper, synthesis and characterizing of bismuth oxide nanoparticles (Bi 2 O 3 NPs) are synthesized by laser ablation at different laser pulses energy 200, 400, 600 and 800 mJ with 100 shots and laser wavelength 1064 nm and porous silicon (PS) was presented. Scanning electron Microscopy (SEM), x-ray diffraction (XRD), UV–vis-NIR spectrophotometer and electrical properties are used to characterize the products. The results show X- ray patterns analysis and improve the crystalline structure of Bi 2 O 3 nanoparticles which relate to α- phase and monoclinic symmetry. SEM image shows approximate spherical particles with a little agglomeration for both samples. From results transmittance of Bi 2 O 3 NPs suspension with energy bandgaps ranging from the infrared up to near-ultraviolet can be obtained, depending on their structure and morphology. Based on these results, we demonstrated enhanced performance of Bi 2 O 3 NPs/PS photoddetectors over a broad range of wavelengths. [ABSTRACT FROM AUTHOR]