Ultrasonic spray pyrolyzed copper oxide and copper-aluminum oxide thin films: Optical, structural and electronic properties

C. Paredes-Sánchez, R. I. Sánchez-Alarcón, O. Hernández-Silva, L. Lartundo-Rojas, G. Alarcón-Flores, E. Pérez-Cappe, Y. Mosqueda-Laffita, G. Mesa-Pérez, C. Falcony, I. A. Garduño-Wilches, S. Carmona-Téllez, M. Aguilar-Frutis

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

4 Citas (Scopus)

Resumen

© 2018 IOP Publishing Ltd. A study of the structural, electrical and optical properties of copper oxide and copper-aluminum oxide thin films deposited by ultrasonic spray pyrolysis is presented in this work. On one hand copper oxide films were deposited at working temperatures in the range from 300 °C to 500 °C. These films present a mixture of Cu 2 O and CuO phases, CuO phase being more abundant at higher temperatures; all samples present p-type conductivity. On the other hand, copper-aluminum oxide samples were deposited at 350 °C but with different copper-aluminum ratios in the start solution (0, 12.5, 25, 50, 100, and 200 at%). The films present a mixture of Cu 2 O and Al 2 O 3 phases, being the Cu 2 O the most abundant and becoming amorphous as aluminum concentration rises. Electrical characterization indicates that electronic conductivity depends on the amount of Cu 2 O, while ionic conductivity increases with aluminum concentration. Aluminum concentration also provokes a shift in the valence band towards lower binding energies, as well as an increase in the optical band gap (from 2.6 to 3.7 eV). Upon a thermal annealing at 800 °C the samples turned to CuAl 2 O 4 spinel structure.
Idioma originalInglés estadounidense
PublicaciónMaterials Research Express
DOI
EstadoPublicada - 1 feb 2019

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