Optical transmittance and photoconductivity studies on ZnO : Al thin films prepared by the sol–gel technique |
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Authors: | A E Jimnez Gonzlez J A Soto Urueta |
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Affiliation: | A. E. Jiménez González,J. A. Soto Urueta |
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Abstract: | Polycrystalline ZnO : Al thin films have been prepared by the (Sol–gel) chemical deposition method. The ZnO : Al thin films are very transparent (90%) in the near UV, VIS and IR regions. The films are oriented along the c-axis (0 0 2] direction) in the hexagonal structure. It is known that pure ZnO thin films are not chemically stable in corrosive media, but aluminium stabilizes the ZnO system and increases its electrical conductivity. Finally, the ZnO : Al thin films are reasonably stable under storage in air and in reactive atmospheres like O2, H2O, H2 or in weak acids. Dark- and photo-conductivity of the ZnO : Al films are very high (1–100 Ω−1 cm−1), so that they can be used as transparent conductors in solar cells or in electrochromic devices. |
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Keywords: | ZnO Optical transmittance Photoconductivity Sol– gel technique |
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