Processing optimization of SiO2-capped aluminum-doped ZnO and amorphous In-Zn-Sn-Oxide thin films for transparent heater and near-infrared reflecting applications

Download

10452525.pdf

Date

2022-2-09

Author

Can, Hilal Aybike

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

236
views

71
downloads

In this study, AZO/SiO2 and amorphous In-Zn-Sn-oxide (a-ZITO) functional coatings were developed with combinatorial approach for transparent heater and heat reflecting applications. AZO/SiO2 and amorphous In-Zn-Sn-oxide (a-ZITO) coatings were obtained via magnetron sputtering. A series of optimization steps were carried out specific to each method and coating type. The samples were produced on 75x50 mm2 glass substrates. Further, optimum post-deposition annealing conditions were identified as 400 °C and Ar+%4 H2 atmosphere to improve electrothermal properties. 750 nm thick and polycrystalline AZO/SiO2 coatings displayed impressive room-temperature electrical conductivity of nearly 3774 S/cm with a sheet resistance of 3.53 Ω/□, carrier concentration of 1.14x1021 cm-3, and Hall mobility of 20.48 cm2/Vs. These films exhibited very high optical transmittance (96%) in the visible range and reflectance (73% at 2.5 µm) in the NIR region. Electrothermal tests demonstrated that the achievable saturation temperature was 161 °C with a power density of 5981 W/m2 in case of applying 12 V. Deicing tests were performed with samples cooled to -40 °C and resulted with complete removal of ice/water only within 180 s. a-ZITO coatings were deposited using a 3” sputtering target on substrates held at 150 °C. This target was prepared within a particular oxide composition which was determined via combinatorial approach. The films were remained amorphous after the annealing step and demonstrated room-temperature electrical conductivity of 1805 S/cm, sheet resistance of 7.49 Ω/□, carrier concentration of 0.3x1021 cm-3, and Hall mobility of 36.59 cm2/Vs. The transmission in the visible range and reflectance at 2.5 µm were measured as 86% and 35%, respectively. a-ZITO coating was displayed a saturation temperature of 112 °C and a power density of 4635 W/m2 whereas defrosting within 173 s (initial temperature -40 °C) was observed with 12 V input.

Subject Keywords

Saydam Isıtıcılar, Isı yansıtıcılar, AZO, ZITO, Magnetron Sıçratma, Transparent heaters, Heat reflecting mirrors, Magnetron Sputtering, Transparent conductive oxides

URI

https://hdl.handle.net/11511/96356

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Solution processed aluminum-doped ZnO thin films for transparent heater applications Tonbul, Beyza; Can, Hilal; Öztürk, Tayfur; Akyıldız, Hasan (2021-06-01) A study was carried out to tailor the properties of ultrasonic spray pyrolysis deposited Al-doped ZnO (AZO) thin films suitable for transparent heater applications. For this purpose, the influences of solvent/precursor type and molarity, Al-doping concentration, nozzle to substrate distance, solution flow rate, carrier gas flow, substrate temperature, and post-deposition annealing on the microstructure, electrical, optical properties, and heating/ deicing behaviors of the films were investigated. The optimi...
Formation and characterization of infrared absorbing copper oxide surfaces Arslan, Burcu; Erdogan, Metehan; Karakaya, İshak (2017-04-30) Copper oxide formation has been investigated to combine the advantages of producing different size and shapes of coatings that possess good light absorbing properties. An aqueous blackening solution was investigated and optimum composition was found as 2.5 M NaOH and 0.225 M NaClO to form velvet copper oxide films. A two-step oxidation mechanism was proposed for the blackening process by carefully examining the experimental results. Formation of Cu2O was observed until the entire copper surface was covered ...
Photovoltaic performance of bifacial dye sensitized solar cell using chemically healed binary ionic liquid electrolyte solidified with SiO2 nanoparticles Cosar, Burak; Icli, Kerem Cagatay; Yavuz, Halil Ibrahim; Özenbaş, Ahmet Macit (2013-01-01) In this study, we investigated the effect of electrolyte composition, photoanode thickness, and the additions of GuSCN (guanidinium thiocyanate), NMB (N-methylbenimidazole), and SiO2 on the photovoltaic performance of DSSCs (dye sensitized solar cells). A bifacial DSSC is realized and irradiated from front and rear sides. The devices give maximum photovoltaic efficiencies for 70% PMII (1-propyl-3-methyl-imidazolium iodide)/30% (EMIB(CN)(4)) (1-ethyl-3-methyl-imidazolium tetracyanoborate) electrolyte composi...
Mechanical and optical properties of SiO2 thin films deposited on glass Simurka, Lukas; Ctvrtlik, Radim; Tomastik, Jan; Bektaş, Gence; Svoboda, Jan; Bange, Klaus (2018-09-01) The optical and mechanical properties of amorphous SiO2 films deposited on soda-lime silicate float glass by reactive RF magnetron sputtering at room temperature were investigated in dependence of the process pressure. The densities of the films are strongly influenced by the process pressure and vary between 2.38 and 1.91 g cm(-3) as the pressure changes from 0.27 to 1.33 Pa. The refractive indices of the films shift between 1.52 and 1.37, while the residual compressive stresses in the deposited films vary...
Synthesis of opaque and colored hollow polymer pigments Karakaya, Ekin; MAVİŞ, BORA; Gündüz, Güngör (2017-09-01) A parametric study was carried out to investigate the effects of process parameters on the properties of opaque and/or colored polymer pigment. The core was synthesized using methyl methacrylate (MMA), methacrylic acid (MAA), and ethylene glycol dimethacrylate, and the shell from styrene. The surfactant/water (S/W) ratio was changed between 0.56 and 1.46, and the best ratio was determined to be 0.97. The increase in the amount of MAA and the pH of the medium increases the diameter of the swollen particles. ...

Citation Formats

H. A. Can, “Processing optimization of SiO2-capped aluminum-doped ZnO and amorphous In-Zn-Sn-Oxide thin films for transparent heater and near-infrared reflecting applications,” M.S. - Master of Science, Middle East Technical University, 2022.