Self-organized in-depth gradients in highly ti-doped zno films: thermal versus mw plasma annealing
EntityUAM. Departamento de Física Aplicada
10.3390/coatings10040418Coatings 10.4 (2020): 418
Funded byWe are thankful for funding from the Ministry of Science, Innovation and Universities of Spain, through grant CTQ2017-84309-C2-2-R
ProjectGobierno de España. CTQ2017-84309-C2-2-R
SubjectsHighly doped semiconductors; Zinc Oxide; Sol-gel; Bandgap; GI-XRF; Física
Rights© 2020 by the authors
Esta obra está bajo una Licencia Creative Commons Atribución 4.0 Internacional.
Highly Ti-doped ZnO films have been produced by a spin-casting sol-gel process. The spin-casted films show high in plane homogeneity and optical quality. However, when inspected in depth, the surface composition is Ti rich. We show that two possible annealing processes can be considered depending on the properties to exploit. To promote in-depth homogenization, thermal annealing processes have been applied. Meanwhile, the gradients can be exacerbated, thanks to a non-negligible surface sputtering, by applying microwave (MW) plasma treatments with Ar discharges at different pressures. The microstructural properties of the differently processed films have been obtained prior to a study by grazing incidence X-ray fluorescence (GI-XRF) spectroscopy, which reveals the in-depth composition trends induced by the two alternative annealing procedures. The final wetting, electrical and optical properties of the films are described in accordance with the Ti distribution pattern revealed by GI-XRF. The study underlines for the first time how MW plasma annealing processes can be used to exacerbate self-induced atomic gradients in sol-gel films with potential implications in catalytic and biomedical applications
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