Investigations of structure and electrical properties of TiO2/CuO thin film heterostructures

Wojcieszak, Damian; Obstarczyk, Agata; Domaradzki, J.; Kaczmarek, Danuta; Zakrzewska, K.; Pastuszek, Roman

doi:10.1016/j.tsf.2019.137538

Cited by 10 publications

(3 citation statements)

References 32 publications

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“…Thin films were prepared by pulsed DC magnetron sputtering [73][74][75][76][77][78][79]. Desired material composition was obtained by simultaneous sputtering (with the appropriate power) of several targets made of Cu and Ti [78,[80][81][82][83][84][85][86]. For all prepared films, the deposition processes were carried out in argon plasma at a pressure of 3 × 10 -2 mbar, which was obtained with an argon flow of approximately 6 mL/min.…”

Section: Thin Films Manufacturingmentioning

confidence: 99%

Influence of Material Composition on Structure, Surface Properties and Biological Activity of Nanocrystalline Coatings Based on Cu and Ti

et al. 2020

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In this paper, the influence of material composition on structure and surface properties of bioactive coatings based on Cu and Ti is described. Nanocrystalline coatings were prepared by innovative pulsed DC magnetron sputtering. For their preparation, a multi-magnetron system was used in order to obtain films with various copper content. The main goal of our work was the complex analysis of biological activity of Cu-Ti films in comparison with their material composition and surface state. Antimicrobial activity (for E. coli and S. aureus), as well as the impact on cell viability (L929 line), were investigated. The physicochemical properties were examined with the aid of X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and atomic absorption spectroscopy. It was found that all prepared films were nanocrystalline and bactericidal, but their cytotoxicity was related to the Cu-content in the film. Complex analysis of the bioactivity was developed in relation to the copper ion migration process. Moreover, manufacturing of antibacterial films with stimulating action on L929 cell line was possible.

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Section: Thin Films Manufacturingmentioning

confidence: 99%

Influence of Material Composition on Structure, Surface Properties and Biological Activity of Nanocrystalline Coatings Based on Cu and Ti

et al. 2020

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“…Copper oxides have a narrow band gap and are a p-type semiconductor. Cupric oxide (CuO) and cuprous oxide (Cu 2 O) are the two types of crystals of copper oxides 6 . CuO is a monoclinic phase, whereas Cu 2 O has a cubic structure, which CuO is more thermostable than Cu 2 O 7 .…”

Section: Introductionmentioning

confidence: 99%

The superior photocatalytic performance and DFT insights of S-scheme CuO@TiO2 heterojunction composites for simultaneous degradation of organics

Hamad

Elsenety

Sadik

et al. 2022

Sci Rep

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The necessity to resolve the issue of rapid charge carrier recombination for boosting photocatalytic performance is a vigorous and challenging research field. To address this, the construction of a binary system of step-scheme (S-scheme) CuO@TiO2 heterostructure composite has been demonstrated through a facile solid-state route. The remarkably enhanced photocatalytic performance of CuO@TiO2, compared with single TiO2, which can consequence in the more efficient separation of photoinduced charge carriers, reduced the band gap of TiO2, improved the electrical transport performance, and improved the lifetimes, thus donating it with the much more powerful oxidation and reduction capability. A photocatalytic mechanism was proposed to explain the boosted photocatalytic performance of CuO@TiO2 on a complete analysis of physicochemical, DFT calculations, and electrochemical properties. In addition, this work focused on the investigation of the stability and recyclability of CuO@TiO2 in terms of efficiency and its physical origin using XRD, BET, and XPS. It is found that the removal efficiency diminishes 4.5% upon five recycling runs. The current study not only promoted our knowledge of the binary system of S-scheme CuO@TiO2 heterojunction composite photocatalyst but also shed new light on the design of heterostructure photocatalysts with high-performance and high stability.

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“…Very good representatives of MO are titanium dioxide (TiO 2 ) and cupric oxide/cuprous oxide (CuO/Cu 2 O), as they are cheap materials, chemically neutral, with environmentally friendly resources and highly resistant to photocorrosion [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. On the other hand, as the titanium dioxide has a bandgap of 2.96–3.2 eV [ 25 , 26 , 27 ] (depending on the TiO 2 form), it may absorb only the ultraviolet, which is ~7% of the sunlight spectrum.…”

Section: Introductionmentioning

confidence: 99%

Formation and Characterization of Stable TiO2/CuxO-Based Solar Cells

Wisz,

Sawicka-Chudy,

Sibiński

et al. 2023

Materials

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According to increasing demand for energy, PV cells seem to be one of the best answers for human needs. Considering features such as availability, low production costs, high stability, etc., metal oxide semiconductors (MOS) are a focus of attention for many scientists. Amongst MOS, TiO2 and CuxO seem to be promising materials for obtaining an effective photoconversion effect. In this paper, specific investigation, aimed at the manufacturing of the complete photovoltaic structure based on this concept is described in detail. A set of samples manufactured by DC magnetron sputtering, with various process parameters, is characterized by morphology comparison, layer structure and material composition investigation, and finally by the obtained photovoltaic parameters. Based on SEM studies, it was established that the films are deposited uniformly and complete their formation; without clearly defined faces, the conglomerates of the film grow individually. These are areas with a uniform structure and orientation of atoms. The sizes of conglomerates are in a normal direction range from 20 to 530 nm and increase with film thickness. The film thickness was in the range from 318 to 1654 nm, respectively. The I-V study confirms the photovoltaic behavior of thin film solar cells. The open-circuit voltage (Voc) and short-circuit current density (Jsc) values of the photovoltaic devices ranged from 1.5 to 300 mV and from 0.45 to 7.26 µA/cm3, respectively, which corresponds to the maximum efficiency at the level of 0.01%. Specific analysis of the junction operation on the basis of characteristics flow, Rs, and Rsh values is delivered.

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Investigations of structure and electrical properties of TiO2/CuO thin film heterostructures

Cited by 10 publications

References 32 publications

Influence of Material Composition on Structure, Surface Properties and Biological Activity of Nanocrystalline Coatings Based on Cu and Ti

Influence of Material Composition on Structure, Surface Properties and Biological Activity of Nanocrystalline Coatings Based on Cu and Ti

The superior photocatalytic performance and DFT insights of S-scheme CuO@TiO2 heterojunction composites for simultaneous degradation of organics

Formation and Characterization of Stable TiO2/CuxO-Based Solar Cells

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