Band Gap Engineering in Spray Pyrolysis Grown Nanocrystalline NiO Thin Films by Fe Doping

Authors H.S. Gavale1, M. S. Wagh1, S.R. Gosavi2

1P.G. Department of Physics, Pratap College, Amalner, 425401, M.S., India

2Material Research Laboratory, C.H.C. Arts, S.G.P. Commerce, and B.B.J.P. Science College, Taloda, 425413, M.S., India

Issue Volume 11, Year 2019, Number 4
Dates Received 22 April 2019; revised manuscript received 01 August 2019; published online 22 August 2019
Citation H.S. Gavale, M. S. Wagh, et al., J. Nano- Electron. Phys. 11 No 4, 04015 (2019)
PACS Number(s) 68.47.Gh, 74.62.Dh, 81.15.Rs, 61.05.C, 78.66. – w
Keywords NiO (17) , Fe doped, Spray pyrolysis (9) , XRD diffraction, Optoelectronic properties (2) .

Thin films of Fe doped nickel oxide (NiO:Fe) with different Fe doping concentration (from 0 % to 10 %) were grown on glass substrate by employing simple spray pyrolysis technique. The effect of different doping concentration of Fe on the structural, morphological, optical and electrical properties has been studied. XRD diffraction patterns show that at low Fe concentration only NiO lattice is present in the deposited thin film with cubic crystal structure, whereas NiFe2O4 compound with cubic crystal structure is deposited at higher Fe concentration. The crystallite size of the films is found to decrease from 15.16 nm to 7.41 nm with an increase in Fe concentration. Morphology of the prepared NiO:Fe thin films was characterized by field emission scanning electron microscopy (FESEM) attached with energy dispersive spectrometer (EDS). FESEM images show that Fe doping did not have any significant effect on the morphology of NiO:Fe thin films. EDS spectra confirm the formation of Fe doped NiO over the substrate surface. The optical investigation revealed that the absorbance in the visible region is found to be increased with an increase in Fe concentration. The optical band gap decreases with an increase in Fe concentration. All the films have electrical resistivity of the order of 104 Ω.cm and are found to be increased with Fe concentration.

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