Growth and investigation of LaNiO3/La2O3 composites films for optoelectronic applications

This work contains the protocol of the preparation of LaNiO3/La2O3 composites using the spray pyrolysis method. First, the structural properties are investigated by X-ray diffraction (XRD) as well as by scanning electron microscopy showing the existence of both LaNiO3 and La2O3 varieties. Also, Raman and Fourier-transform infrared spectroscopies (FTIR) depict the presence of these two materials. Second, the reflectance and the transmittance of the different samples are studied and the optical band gap value varies from 1.62 to 2.27 eV. Furthermore, the evaluation of the PL measurements describes the peaks in the emission ranges of violet, blue and green. Finally, the thermal properties of this studied composite is done via EPE technique reveals that the composite deposited on ITO substrates heat more than when it deposited at glass.