Comparative study of hydrothermal treatment and thermal annealing effects on the properties of electrodeposited micro-columnar ZnO thin films
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LUPAN, Oleg; PAUPORTE, Thierry; TIGINYANU, Ion; URSAKI, Veacheslav; ŞONTEA, Victor; ONO, Luis K.; CUENYA, Beatriz Roldan; CHOW, Lee. Comparative study of hydrothermal treatment and thermal annealing effects on the properties of electrodeposited micro-columnar ZnO thin films. In: Thin Solid Films. 2011, nr. 22(519), pp. 7738-7749. ISSN -.
10.1016/j.tsf.2011.05.072
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Thin Solid Films
Numărul 22(519) / 2011 / ISSN - /ISSNe 0040-6090

Comparative study of hydrothermal treatment and thermal annealing effects on the properties of electrodeposited micro-columnar ZnO thin films


DOI: 10.1016/j.tsf.2011.05.072
Pag. 7738-7749

Lupan Oleg12, Pauporte Thierry2, Tiginyanu Ion3, Ursaki Veacheslav3, Şontea Victor1, Ono Luis K.4, Cuenya Beatriz Roldan4, Chow Lee4
 
1 Technical University of Moldova,
2 Laboratoire d'Electrochimie, Chimie des Interfaces et Modélisation pour l'Energie (LECIME),
3 Institute of the Electronic Engineering and Nanotechnologies "D. Ghitu" of the Academy of Sciences of Moldova,
4 University of Central Florida
 
Disponibil în IBN: 28 martie 2018


Rezumat

We report a comparison of the role played by different sample treatments, namely, a low-temperature hydrothermal treatment by hot H2O vapor in an autoclave versus thermal annealing in air on the properties of ZnO films grown by electrochemical deposition (ECD). Scanning electron microscopy studies reveal a homogeneous micro-columnar morphology and changes in the film surface for the two different treatments. It is found that post-growth hydrothermal treatments of ECD ZnO films at 150 °C under an aqueous environment enhance their structural and optical properties (photoluminescence, transmission, Raman spectra, etc.) similar to thermal annealing in air at higher temperatures (> 200 °C). The modifications of the structural and optical properties of ZnO samples after thermal annealing in air in the temperature range of 150-600 °C are discussed. The removal of chlorine from the films by the hydrothermal treatment was evidenced which could be the main reason for the improvement of the film quality. The observation of the enhanced photoluminescence peak at 380 nm demonstrates the superior properties of the hydrothermally treated ZnO films as compared to the films annealed in air ambient at the same or higher temperature. This post-growth hydrothermal treatment would be useful for the realization of high performance optoelectronic devices on flexible supports which might not withstand at high temperature annealing treatments.

Cuvinte-cheie
Electrodeposition, photoluminescence, Raman spectroscopy, thin films, zinc oxide,

Hydrothermal treatment, Thermal annealing, X-ray photoelectron spectroscopy