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Optoelectronic properties of SnO2 thin films sprayed at different deposition times |
Allag Abdelkrim, Saâd Rahmane, Ouahab Abdelouahab, Attouche Hafida, Kouidri Nabila |
Laboratoire de Physique des Couches Minces et Applications, Université de Biskra, BP 145 RP, 07000 Biskra, Algérie |
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Abstract This article presents the elaboration of tin oxide (SnO2) thin films on glass substrates by using a home-made spray pyrolysis system. Effects of film thickness on the structural, optical, and electrical film properties are investigated. The films are characterized by several techniques such as x-ray diffraction (XRD), atomic force microscopy (AFM), ultraviolet-visible (UV-Vis) transmission, and four-probe point measurements, and the results suggest that the prepared films are uniform and well adherent to the substrates. X-ray diffraction (XRD) patterns show that SnO2 film is of polycrystal with cassiterite tetragonal crystal structure and a preferential orientation along the (110) plane. The calculated grain sizes are in a range from 32.93 nm to 56.88 nm. Optical transmittance spectra of the films show that their high transparency average transmittances are greater than 65% in the visible region. The optical gaps of SnO2 thin films are found to be in a range of 3.64 eV-3.94 eV. Figures of merit for SnO2 thin films reveal that their maximum value is about 1.15×10-4 Ω-1 at λ = 550 nm. Moreover, the measured electrical resistivity at room temperature is on the order of 10-2 Ω·cm.
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Received: 19 November 2015
Revised: 15 December 2015
Accepted manuscript online:
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PACS:
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68.55.ag
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(Semiconductors)
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68.35.bg
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(Semiconductors)
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81.05.Bx
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(Metals, semimetals, and alloys)
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Corresponding Authors:
Saâd Rahmane
E-mail: rahmanesa@yahoo.fr
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Cite this article:
Allag Abdelkrim, Saâd Rahmane, Ouahab Abdelouahab, Attouche Hafida, Kouidri Nabila Optoelectronic properties of SnO2 thin films sprayed at different deposition times 2016 Chin. Phys. B 25 046801
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