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Structural, optical and electrical properties of delafossite CuGaO2 films grown by sol-gel method
Author(s): M. J. Han; T. Huang; J. Z. Zhang; Y. W. Li; Z. G. Hu
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Paper Abstract

Transparent p-type conductive CuGaO2 films have been fabricated on sapphire substrates by sol–gel method. The stable sol solution for CuGaO2 were formed by copper(II) acetate monohydrate and gallium(III) nitrate hydrate, and the c-axis orientation of CuGaO2 films were strengthened with increasing annealing temperature. The pure phase CuGaO2 film was obtained at 900°C for 30 min in N2 atmosphere, and its microstructure, compositions, optical and electrical properties were analyzed. It was found that the sol-gel derived CuGaO2 films show a high optical transparency (60-80%) in the visible region, the direct and indirect band gaps were approximately 3.56 and 3.24 eV, respectively. It shows a crossover from the thermal activation behavior to that of three-dimensional variable range hopping from the temperature-dependent electrical conductivity at about 160 K.

Paper Details

Date Published: 16 December 2013
PDF: 5 pages
Proc. SPIE 9068, Eighth International Conference on Thin Film Physics and Applications, 906809 (16 December 2013); doi: 10.1117/12.2053125
Show Author Affiliations
M. J. Han, Shanghai Dianji Univ. (China)
East China Normal Univ. (China)
T. Huang, East China Normal Univ. (China)
J. Z. Zhang, East China Normal Univ. (China)
Y. W. Li, East China Normal Univ. (China)
Z. G. Hu, East China Normal Univ. (China)

Published in SPIE Proceedings Vol. 9068:
Eighth International Conference on Thin Film Physics and Applications
Junhao Chu; Chunrui Wang, Editor(s)

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