Cobalt oxide (Co3O4) NPs was created utilizing Nigella sativa extract and the green synthesis process, and it was then dropped onto a glass substrate. The crystal structural makeup of Nano-particles was ascertained using the X-ray diffraction (XRD) pattern. and described as a material function for applications such as solar cells and light detectors. The surface morphology revealed the surface of (Co3O4)-coated municipal embroidery by inspecting the XRD, According to XRD measured data, all of the films are Nano-crystallized in the cubic spinel configuration and have an uniform dispersion seven main peaks correspond to the (2θ,hkl) 18.9544o-(111), 31.1402o-(220), 36.6685o-(311), 44.6107o-(400), 59.4292o-(332), 65.2836o-(440), 77.31370-(333). These improvements have an effect on the optical characteristics. The optical band gap was calculated using the absorption coefficient The optical band gap energy Eg1=2.2 eV, Eg1=3.7 eV was encountered by us. In contrast, In order to identify the functional groups present in bismuth oxide molecules, FTIR analysis revealed the strength of infrared absorption as a function of wavelength, as seen in the Co-O band. On the other hand, the FTIR analysis. Using FE-SEM morphology, the incorporation of nano-crystaline in various sizes and forms was examined. The prepared films' AFM pictures are displayed [Avg. Dimensions are 75.62 nm, 1.39 roughness units, and 1.68 nm root mean square .The optical and structural properties of Co3O4 nanoparticle films were investigated in order to determine the optical energy gap and crystallite size. revealed the presence of the tetragonal phase... Finally, the (I-V) and find the parameter of solar cell (Ag / Co3O4 / Psi /Si / Ag) are filling factor is FF= 29.62 and transformation Efficiency η =3.2%.
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