Nanofibrous-like ZnO layers deposited by magnetron sputtering and their integration in dye-sensitized solar cells

Lupan, Oleg; Guérin, Victoire-Marie; Ghimpu, Lidia; Tiginyanu, I. M.; Pauporté, Thierry

doi:10.1016/j.cplett.2012.08.071

Cited by 45 publications

(18 citation statements)

References 24 publications

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“…[1][2][3][4][5][6] In this context, fabrication of three-dimensional (3-D) networks of interconnected ZnO tetrapods (ZnO-T) has been a very important step for progress in engineering, science and nanotechnology. 1,[3][4][6][7][8] Recently the research group of Rainer Adelung has demonstrated a fast and simple synthesis of highly porous interconnected ZnO-T networks by a crucible flame transport synthesis (C-FTS) approach and burner flame transport synthesis (B-FTS).…”

Section: Introductionmentioning

confidence: 99%

Hybridization of Zinc Oxide Tetrapods for Selective Gas Sensing Applications

Lupan

Postica

Gröttrup

et al. 2017

ACS Appl. Mater. Interfaces

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141

113

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In this work, the exceptionally improved sensing capability of highly porous 3-D hybrid ceramic networks with respect to reducing gases is demonstrated for the first time. The 3-D hybrid ceramic networks are based on metal oxides Me= Fe, Cu, Al) doped and alloyed zinc oxide tetrapods (ZnO-T) forming numerous heterojunctions. A change in morphology of the samples and formation of different complex microstructures is achieved by mixing the metallic (Fe, Cu, Al) microparticles with ZnO tetrapods grown by flame transport synthesis (FTS) approach with different weight ratios (ZnO:Me, e.g., 20:1) and followed by subsequent thermal annealing them in air. The gas sensing studies reveal the possibility to control and change/tune the selectivity of the materials, depending on the elemental content ratio and the type of the added metal oxide in 3-D ZnO-T hybrid networks.While pristine ZnO-T networks showed a good response to H2 gas, a change/tune in selectivity to ethanol vapour with a decrease in optimal operating temperature was observed in the networks hybridized with Fe-oxide and Cu-oxide. In case of hybridization with ZnAl2O4 an improvement of H2 gas response (to ≈ 7.5) was reached at lower doping concentrations (20:1), whereas the increasing in concentration of ZnAl2O4 (10:1), the selectivity changes to methane CH4 gas (response ≈ 28). Selectivity tuning to different gases is attributed to the catalytic properties of the metal oxides after hybridization, while the sensitivity improvement is mainly associated with additional modulation of resistance by the built-in potential barriers between n-n and n-p heterojunctions, during adsorption and desorption of gaseous species. Density functional theory based calculations provided the mechanistic insights into the interactions between different hybrid networks and gas molecules supporting the experimentally observed results. The studied materials and sensor structures would provide particular advantages in the field of fundamental research, industrial and ecological applications.

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Section: Introductionmentioning

confidence: 99%

Hybridization of Zinc Oxide Tetrapods for Selective Gas Sensing Applications

Lupan

Postica

Gröttrup

et al. 2017

ACS Appl. Mater. Interfaces

Self Cite

141

113

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“…Substrates with silicon trenches were cleaned as reported before [10]. Next the latter were mounted on a rotatable substrate holder equipped with a resistive heater, all technical details can be found in our previous reports [11,12,13] For the photocatalytic studies, ZnO samples were placed in a solution of 0. with a magnetic stirrer. Aliquots of ~1ml were taken every 15 min and their absorption was measured in a Perkin Elmer UV/Vis/NIR Spectrometer Lambda 900.…”

Section: Methodsmentioning

confidence: 99%

Photocatalytic Applications of Doped Zinc Oxide Porous Films Grown by Magnetron Sputtering

Ghimpu

Reimer

Smazna

et al. 2016

3rd International Conference on Nanotechnologies and Biomedical Engineering

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Abstract-Undoped, Al-doped and Sn-doped ZnO was sputter-deposited on glass substrates and on trenched Si substrates and some properties of these samples were evaluated. It was shown that the photocatalytic performance of the thin layers is improved by doping with Sn and Al. The samples doped with Al-doping provided a more pronounced effect compared to the control sample, as well as compared to the greater volume of undoped ZnO deposited on Si substrates. Morphology of produced particles was studied using transmission electron microscopy. Electron diffraction patterns were taken to confirm lattice parameters of the materials. Size and shape variations were monitored for un-doped, Al-doped and Sn-doped ZnO. EDX spectroscopy was utilized to assay chemical composition for doped and un-doped samples.

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“…In order to overcome this issue, electricity can be obtained by directly converting sunlight by the use of photovoltaic devices [1]. Dye-sensitized solar cells (DSSC) belong to the new generation with low cost and having easy fabrication [2]. The semiconductor has the responsibility for the absorption of light and the transport of charge carriers for conventional solar cells.…”

Section: Introductionmentioning

confidence: 99%

Characterization of spray-deposited ZnO thin films for dye-sensitized solar cell application

Rani

Ernest

2016

Appl. Phys. A

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ZnO films have been prepared on glass plates with concentrations of 0.025, 0.05 and 0.1 M each consisting of 50 ml of solution using the spray pyrolysis technique. A dye-sensitized solar cell (DSSC) was constructed by means of the obtained film for 0.1 M which was also coated above the ITO substrate. N-719, iodide and platinum-coated ITO glass plates were used as the dye, electrolyte and counter electrode, respectively. XRD confirms that the structure of the film was polycrystalline having wurtzite structure. The surface with pores was found from the FESEM studies. The DSSC shows an optical transmittance of approximately 70 % in the visible region. The photoluminescence study reveals the electronic structure of the material. The efficiency of the DSSC measured for a 0.1 M ZnO thin film by sensitizing every 2 h was g = 0.51, 0.80, 0.54, 1.12, 2.11, 2.71, 3.15 and 3.20 %, respectively.

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Nanofibrous-like ZnO layers deposited by magnetron sputtering and their integration in dye-sensitized solar cells

Cited by 45 publications

References 24 publications

Hybridization of Zinc Oxide Tetrapods for Selective Gas Sensing Applications

Hybridization of Zinc Oxide Tetrapods for Selective Gas Sensing Applications

Photocatalytic Applications of Doped Zinc Oxide Porous Films Grown by Magnetron Sputtering

Characterization of spray-deposited ZnO thin films for dye-sensitized solar cell application

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