CETMIC   05378
CENTRO DE TECNOLOGIA DE RECURSOS MINERALES Y CERAMICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Characterization of ZnO films deposited by sol-gel dip-coating
Autor/es:
E.A. VILLEGAS; M. R. TEJERINA; G.SUAREZ; R.PARRA
Lugar:
Foz de Iguazú
Reunión:
Congreso; 7º Internation Congress on Ceramics; 2018
Institución organizadora:
International Ceramic Federation
Resumen:
Ceramic thin films are widely studied because of its interest for technological applications [1-3]. These structures are capable of setting specific properties on the substrate: conductive properties, emission, selective filtering and absorption of light, among many other properties. ZnO is a wide-bandgap semiconductor of the II-VI semiconductor group. The native doping of the semiconductor due to oxygen vacancies or zinc interstitials is n-type. This semiconductor has several favorable properties, including good transparency, high electron mobility, wide bandgap, and strong room-temperature luminescence. Those properties are valuable for various emerging applications: transparent electrodes in liquid crystal displays, energy-saving or heat-protecting windows, and electronics as thin-film transistors, solar cells and light-emitting diodes. An important challenge to develop these coatings is controlling their thickness and microstructure and these properties usually vary significantly depending on the specific combination of the experimental conditions [4].In this work, we present the effect of several coating cycles of ZnO films deposited by sol-gel dip-coating. The same experimental conditions were simultaneously employed for all the cases: precursor solution, annealing process, withdraw velocity, etc. Integrity of the coating was measured by Scanning Electron Microscopy direct observation, their cristallinity was estimated by XRD, transparency of samples was determined by spectrophotometry, and Atomic Force Microscopy was employed for thickness and final grain size determination.As a valuable result, it was observed that the grain size is affected by the number of coatings: the grain mean size decreased when the amount of coatings was increased. An explanation of this effect was inferred and its implication in future studies is analyzed.[1]C. Jeffrey Brinker, Alan Hurd, Fundamentals of sol-gel dip-coating, Journal de Physique III, 7 (1994) 1231.[2]H. A. Macleod, Thin films optical filters, Institute of Physics Publishing, 2001.[3]F. C. Alvira, L. Ponce Cabrera, Y. Peñaloza Mendoza, M. L. Martinez Ricci, F. Videla, Pulsed Laser deposition of PbTe under monopulse and multipulse regime. Opt. Laser in Eng. 90 (2017)284. [4] S. Marouf, A.Beniaiche,H. Guessas, A. Azizi, Morphological, structural and Optical Properties of ZnO Thin Films Deposited by Dip Coating Method, Materials Research 20 (2017), 88.