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Effect of ZnO Film Thickness on its Optical and Structural Properties

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Abstract:

In this study, we report the effect of ZnO film thickness on its optical and structural properties. The sol solution was synthesized by sol-gel method and deposited on silicon substrates by spin coating technique. The ZnO films thickness was varied from 60 to 180 nm. The ZnO films obtained showed a highly preferred orientation along the (002) plane. It was also observed that the crystallite size was not affected by increasing thickness. Transmittance measurements indicated that the ZnO films have a high transparency in the visible range (~90 %), which remained constant with thickness. Morphological evolution measurements confirmed that the thinner ZnO film consist mostly of a porous layer which became homogeneous and compact to increase the thickness. Photoluminescence measurements exhibit a strong ultraviolet (UV) emission, and the emission intensity was improved with thickness due to crystallinity enhancement.

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Journal of Nano Research Vol. 52 View Preview

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Periodical:

Journal of Nano Research (Volume 52)

Pages:

102-114

DOI:

https://doi.org/10.4028/www.scientific.net/JNanoR.52.102

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Online since:

May 2018

Authors:

Rene Pérez-Cuapio*, Mauricio Pacio, Héctor Juárez, José Alberto Alvarado, Cesia Guarneros, Carlos Bueno, Abraham Pacio

Keywords:

Crystallinity, Sol Gel, Strain, Surface Evolution, Thickness

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© 2018 Trans Tech Publications Ltd. All Rights Reserved

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