Zinc oxide films by thermal oxidation of zinc thin films

Li, Zhengwei; Gao, Wei; Reeves, Roger J.

doi:10.1016/j.surfcoat.2004.10.111

Cited by 77 publications

(40 citation statements)

References 20 publications

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“…For the ZnO films oxidized at higher temperature, these values, calculated using the (002) and (100) diffraction peaks, are slightly larger than standard values for ZnO polycrystalline powder (a = 3.249 Å, c = 5.201 Å) [14,16]. This fact can be explained as an effect of the oxygen depletion in the film during oxidation process [14,16]. The presence of other phases in ZnO system, as well of non-oxidized Zn atoms is not observed.…”

Section: Microstructural Characteristicsmentioning

confidence: 59%

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Structural Characteristics and Optical Properties of Thermally Oxidized Zinc Films

Rusu

Luca

2011

Acta Phys. Pol. A

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Zinc oxide (ZnO) thin films (with thickness ranged from 780 nm to 1150 nm) were prepared by thermal oxidation in air (at 600-700 K, for 20-30 min) of vacuum evaporated metallic zinc films. The Zn films were deposited on glass substrates at room temperature. The crystalline structure of ZnO thin film samples was investigated using X-ray diffraction technique. The diffraction patterns revealed that the ZnO thin films were polycrystalline and have a wurtzite (hexagonal) structure. The film crystallites are preferentially oriented with (002) planes parallel to substrate surface. Some important structural parameters (lattice parameters of the hexagonal cell, crystallite size, Zn-O bond length, residual stress, etc.) of the films were determined. The surface morphology of the prepared ZnO thin films, investigated by atomic force microscopy, revealed a uniform columnar structure. The spectral dependence of transmission coefficient has been studied in the wavelength range from 300 nm to 1700 nm. The optical energy band gap calculated from the absorption spectra (supposing allowed direct band-to-band transitions) are in the range 3.17-3.19 eV. The dependence of the microstructural and optical characteristics on the preparation conditions (oxidation temperature, oxidation time, etc.) of the oxidized zinc films is discussed.

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Section: Microstructural Characteristicsmentioning

confidence: 59%

“…Therefore, the films crystallites are preferentially oriented with c-axis normal to substrate surface. ZnO crystalline structure [1,11,[14][15][16]. It can be observed that the diffraction patterns do not indicate the presence of zinc crystalline phase in ZnO films.…”

Section: Microstructural Characteristicsmentioning

confidence: 99%

Structural Characteristics and Optical Properties of Thermally Oxidized Zinc Films

Rusu

Luca

2011

Acta Phys. Pol. A

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“…Inorganic nc-ZnO is a promising candidate for such hybrid structures, due to its unique properties, such as wide bandgap (3.2eV), high conductivity and high excitonic binding energy (60Mev). 10 In addition, the conduction band edge position of ZnO is similar to that of TiO 2 . Dye-sensitization has provided a successful solution to extending the absorption range of the cell to low-energy light with effective result.…”

Section: Introductionmentioning

confidence: 74%

SYNTHESIS AND PHOTOSENSITIVE PERFORMANCE OF NANOSTRUCTURED ZnO/DYE HYBRID FILM FOR ENERGY CONVERSION

Rani

Tripathi

2013

Int. J. Mod. Phys. Conf. Ser.

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The ZnO film prepared by doctor blade method are highly porous in presence of structure directing agent PEG and then can be easily sensitized by various molecules. In the present work, the nanostructured ZnO/dye hybrid film prepared by doctor blade method has been investigated in conductivity and photoconductivity measurements in view of applications in dye-sensitized solar cells (DSSC) and in optoelectronics, since electron transport in these devices plays a decisive role for the electron collection efficiency and therefore for the overall efficiency. The absorption of ZnO film sensitized by Rose Bengal dye (RB) has been studied by UV spectroscopy which indicates that after the dye is adsorbed on the ZnO electrode, its absorption spectra showed redshift in the peak position compared to the absorbance spectra of dye in ethanol. Highly porous ZnO films are found to have high dark conductivity, probably because of a higher n-doping, which is due to higher concentration of Zn atoms in the film. On the other hand, ZnO/RB hybrid film is found to show a much higher sensitivity to illumination with visible light in photoconductivity measurements due to a higher absolute photoconductivity and lower conductivity in the dark.

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“…Porous ZnO thin films were also obtained by thermally oxidizing metallic Zn films deposited by DC sputtering [35]. The effect of using different pressure conditions (2 and 10 mTorr) and deposition atmospheres (pure Ar instead of mixed Ar + O2, 10%) was first investigated.…”

Section: Sputteringmentioning

confidence: 99%

Porous Zinc Oxide Thin Films: Synthesis Approaches and Applications

Laurenti

Cauda

2018

Coatings

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Zinc oxide (ZnO) thin films have been widely investigated due to their multifunctional properties, i.e., catalytic, semiconducting and optical. They have found practical use in a wide number of application fields. However, the presence of a compact micro/nanostructure has often limited the resulting material properties. Moreover, with the advent of low-dimensional ZnO nanostructures featuring unique physical and chemical properties, the interest in studying ZnO thin films diminished more and more. Therefore, the possibility to combine at the same time the advantages of thin-film based synthesis technologies together with a high surface area and a porous structure might represent a powerful solution to prepare ZnO thin films with unprecedented physical and chemical characteristics that may find use in novel application fields. Within this scope, this review offers an overview on the most successful synthesis methods that are able to produce ZnO thin films with both framework and textural porosities. Moreover, we discuss the related applications, mainly focused on photocatalytic degradation of dyes, gas sensor fabrication and photoanodes for dye-sensitized solar cells.

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Zinc oxide films by thermal oxidation of zinc thin films

Cited by 77 publications

References 20 publications

Structural Characteristics and Optical Properties of Thermally Oxidized Zinc Films

Structural Characteristics and Optical Properties of Thermally Oxidized Zinc Films

SYNTHESIS AND PHOTOSENSITIVE PERFORMANCE OF NANOSTRUCTURED ZnO/DYE HYBRID FILM FOR ENERGY CONVERSION

Porous Zinc Oxide Thin Films: Synthesis Approaches and Applications

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