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We present a comparison between zinc oxide films made by sol-gel dip-coating and spray-pyrolysis to be employed in opto-electronic applications. Grain size, shape, roughness, thickness, band gap, composition, crystalline orientation, electrical resistivity, and optical guided modes were evaluated by AFM, SEM, EDS, optical transmittance, electrical resistance, and end-fire coupling method, respectively. From these results, it was determined that dip-coated film is thinner (with a thickness of about 130 nm) than the spray-pyrolysis one (of about 500 nm), whereas the former showed lower roughness and higher electrical resistivity. Furthermore, a 532 nm continuous laser was coupled across the sprayed film because of its greater thickness. We conclude that the studied techniques can be complementarily implemented to obtain high-performance coatings for photonic applications, combining the lower roughness of dip coating and the wider thickness of spray-pyrolysis films..
Sol-gel thin films, Dip-coating, Spray pyrolysis.
G. SUAREZ, F. C. ALVIRA, R. PARRA, M. R. TEJERINA, Characterization of thin coatings based on ZnO for photonic applications, Optoelectronics and Advanced Materials - Rapid Communications, 13, 9-10, September-October 2019, pp.535-538 (2019).
Submitted at: Jan. 11, 2019
Accepted at: Oct. 9, 2019