Semiconductor Physics, Quantum Electronics & Optoelectronics. 2017. V. 20, N 1. P. 055-063.

An original way to obtain porous Zn(1–x)MgxO thin films by spray pyrolysis technique
Abdelhakim Mahdjoub1,*, Abdelaali Hafid1, Mohammed Salah Aida2, Abdelhamid Benhaya3

1Laboratoire des Matériaux et Structures des Systèmes Electromécaniques et leur Fiabilité (LMSSEF) Université d’Oum El Bouaghi BP 358, Algérie *E-mail:
2Laboratoire des Couches Minces et Interfaces (LCMI), Université de Constantine I, Constantine 25000, Algérie
3Laboratoire d’Electronique Avancée (LEA), Université de Batna, Batna 05000, Algérie

Abstract. Zn(1–x)MgxO thin films with various concentrations of magnesium were deposited using the spray pyrolysis method. The transmittance spectra recorded for all films exhibit maxima exceeding 90%. The band gap energy of the films with wurtzite structure increases from 3.22 up to 3.60 eV by incorporating Mg into ZnO. However, when the atomic ratio of Mg exceeded 0.4, a second crystalline phase (assigned to cubic MgO) became discernable in XRD patterns, a compressive strain was observed in the wurtzite lattice, and crystallite sizes decreased significantly. In accordance with these observations, finer grains with a pronounced columnar growth were observed in 3D AFM representations and the surface roughness decreases significantly. Finally, selective etching in water yields to porous films with a great surface-to-volume ratio, a lower refractive index and a better light transmission. These porous films with tunable band gap seem to be excellent candidates to various interesting applications.

Keywords: zinc oxide, magnesium, thin films, transmittance, porosity.

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