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Structural and morphological characterization of sol-gel ZnO:Ga films: Effect of annealing temperatures
Bulgarian Acad Sci, Cent Lab Solar Energy & New Energy Sources, Tzarigradsko Chaussee 72, BU-1784 Sofia, Bulgaria..
Bulgarian Acad Sci, Cent Lab Solar Energy & New Energy Sources, Tzarigradsko Chaussee 72, BU-1784 Sofia, Bulgaria..
Bulgarian Acad Sci, Inst Elect, Tzarigradsko Chaussee 72, BU-1784 Sofia, Bulgaria..
Univ Liege, Inst Chem B6, LCIS SUPRATECS, Liege, Belgium..
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2018 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 646, p. 132-142Article in journal (Refereed) Published
Abstract [en]

Sol-gel technology has been successfully applied for obtaining ZnO:Ga films by spin coating method. Their structural and optical properties are studied depending on the doping contents and on the annealing temperatures varying from 300 to 600 degrees C. The Ga doping has been achieved by dissolving 1, 2 and 3 wt% Ga(NO3) into Zn sol solution. The structural analysis performed by X-Ray diffraction (XRD) shows a deterioration of the film crystallization with gallium incorporation. The XRD study reveals no impurity peaks associated to metallic gallium or gallium oxide phases. Vibrational properties have been characterized by Fourier Transform Infrared (FTIR) spectroscopy. FTIR analysis gives no certain evidence for presence of Ga oxide phases, but the absorption bands are clearly affected by Ga additive and there can be possible overlapping of Zn-O and Ga-O vibrations. The sol-gel ZnO:Ga films possess higher transparency in the visible spectral range compared to zinc oxide films. The optical band gaps of ZnO:Ga films are found to be widening due to gallium doping. The film morphology is investigated by Atomic force microscopy and it has been found that Ga doping in ZnO affects significantly the film morphology. The surface roughness of ZnO:Ga films is smaller compared to ZnO.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2018. Vol. 646, p. 132-142
Keywords [en]
Thin films, Sol-gel, Gallium-doped zinc oxide, Microstructure, Morphology, Optical properties
National Category
Physical Sciences Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-338955DOI: 10.1016/j.tsf.2017.11.042ISI: 000418575900019OAI: oai:DiVA.org:uu-338955DiVA, id: diva2:1178173
Available from: 2018-01-29 Created: 2018-01-29 Last updated: 2018-02-27Bibliographically approved

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