Transparent ZnO Films Deposited by Aqueous Solution Process Under Various pH Conditions

Hong, Jeong Soo; Wagata, Hajime; Ohashi, Naoki; Katsumata, Ken Ichi; Okada, Kiyoshi; Matsushita, Nobuhiro

doi:10.1007/s11664-015-3670-3

Cited by 7 publications

(4 citation statements)

References 30 publications

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“…Sample D shows the highest transmittance in the visible-light region before annealing, while sample H shows the same after annealing. The average transmittances in the visible region (400-700 nm [35]) are 79.1% for sample D and 78.7% for sample H. There is no significant difference in the transmittance before and after annealing.…”

Section: Optical Properties and Sustainability Of Tio 2 Filmsmentioning

confidence: 87%

Thermoinduced and Photoinduced Sustainable Hydrophilic Surface of Sputtered-TiO2 Thin Film

et al. 2021

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To achieve self-cleaning at a low maintenance cost, we investigated the possibility of obtaining a sustainable hydrophilic surface of TiO2 thin film. As the hydrophilicity of TiO2 films fabricated by FTS has not yet been studied, we deposited TiOx using FTS, and then TiO2 was formed through additional treatment. Hydrophilic surfaces were obtained by thermoinduced and photoinduced methods. UV irradiation led to the conversion of Ti4+ to Ti3+ in the lattice structure and an increase in the number of OH groups on the surface, and annealing induced the formation of Ti3+ defect sites, as well as organic degradation and changes in the crystal structure. Through the annealing process, the water contact angle of as-deposited film was decreased from 78.7° to 35.7°, and crystallinity changed from amorphous to anatase. These changes contributed to the formation of a hydrophilic surface and reduced the water contact angle by up to 10.8°. After the formation of a hydrophilic surface through annealing and UV irradiation, the sample returned to its original state. We confirmed that the water contact angle of the returned sample was decreased through exposure to sunlight; it reduced the water contact angle of the returned sample by 15.2°. Thus, the results revealed that the crystallinity influences the hydrophilicity and its sustainability for TiO2 films under sunlight.

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Section: Optical Properties and Sustainability Of Tio 2 Filmsmentioning

confidence: 87%

Thermoinduced and Photoinduced Sustainable Hydrophilic Surface of Sputtered-TiO2 Thin Film

et al. 2021

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“…Due to its importance and recent advances in real-time x-ray scattering, the deposition of ZnO layers by spray deposition will be reviewed in this separate section: firstly, ZnO is a barrier layer and possible replacement for the titania layers in OPV and OE and has thus gained great interest [385]. Hence, the spray deposition of ZnO is an area of active research [372,[386][387][388][389][390][391][392][393], and will therefore be shortly reviewed.…”

Section: Deposition Of Zno Layersmentioning

confidence: 99%

A deep look into the spray coating process in real-time—the crucial role of x-rays

Roth

2016

J. Phys.: Condens. Matter

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Tailoring functional thin films and coating by rapid solvent-based processes is the basis for the fabrication of large scale high-end applications in nanotechnology. Due to solvent loss of the solution or dispersion inherent in the installation of functional thin films and multilayers the spraying and drying processes are strongly governed by non-equilibrium kinetics, often passing through transient states, until the final structure is installed. Therefore, the challenge is to observe the structural build-up during these coating processes in a spatially and time-resolved manner on multiple time and length scales, from the nanostructure to macroscopic length scales. During installation, the interaction of solid-fluid interfaces and between the different layers, the flow and evaporation themselves determine the structure of the coating. Advanced x-ray scattering methods open a powerful pathway for observing the involved processes in situ, from the spray to the coating, and allow for gaining deep insight in the nanostructuring processes. This review first provides an overview over these rapidly evolving methods, with main focus on functional coatings, organic photovoltaics and organic electronics. Secondly the role and decisive advantage of x-rays is outlined. Thirdly, focusing on spray deposition as a rapidly emerging method, recent advances in investigations of spray deposition of functional materials and devices via advanced x-ray scattering methods are presented.

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“…Various deposition methods have previously been proposed for the deposition of high-quality β-Ga 2 O 3 films including pulsed laser deposition, chemical vapor deposition, metal organic chemical vapor deposition, and radio-frequency sputtering [11][12][13][14]; however, they are energy-intensive and require expensive equipment [15]. On the other hand, the solution process for film fabrication has many advantages including low environmental load and cost [15][16][17]. However, the structural properties of β-Ga 2 O 3 are not stable, and the solution process requires an annealing process at temperatures higher than 900 • C; therefore, a solution process for fabricating β-Ga 2 O 3 films is required [18].…”

Section: Introductionmentioning

confidence: 99%

Effects of Drying Temperature and Molar Concentration on Structural, Optical, and Electrical Properties of β-Ga2O3 Thin Films Fabricated by Sol–Gel Method

2021

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In this study, β-Ga2O3 films were fabricated on a quartz substrate by the sol–gel method using different drying temperatures and solutions of different molar concentrations, and their structural, optical, and electrical properties were evaluated. The as-fabricated films exhibited a monoclinic β-Ga2O3 crystal structure, whose crystallinity and crystallite size increased with increasing molar concentration of the solutions used and increasing drying temperature. Scanning electron microscopy of the as-prepared samples revealed dense surface morphologies and that the thickness of the films also depended on the deposition conditions. The average transmittance of all the samples was above 8% in visible light, and the calculated optical bandgap energy was 4.9 eV. The resistivity measured using a 4-point probe system was 3.7 × 103 Ω cm.

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Transparent ZnO Films Deposited by Aqueous Solution Process Under Various pH Conditions

Cited by 7 publications

References 30 publications

Thermoinduced and Photoinduced Sustainable Hydrophilic Surface of Sputtered-TiO2 Thin Film

Thermoinduced and Photoinduced Sustainable Hydrophilic Surface of Sputtered-TiO2 Thin Film

A deep look into the spray coating process in real-time—the crucial role of x-rays

Effects of Drying Temperature and Molar Concentration on Structural, Optical, and Electrical Properties of β-Ga2O3 Thin Films Fabricated by Sol–Gel Method

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