Browsing by Author "Can, Hilal Aybike"

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Citation - WoS: 2
Citation - Scopus: 1
A Combinatorial Study on Zno-In2o3 System: the Effects of Different Postgrowth Annealing Conditions on Optical and Electrical Properties
(Elsevier Science Sa, 2022) Can, Hilal Aybike; Öztürk, Tayfur; Akyıldız, Hasan
ZnO-In2O3-SnO2 (ZITO) thin film library was produced via the combinatorial approach. The films were deposited using a magnetron sputtering system. Varying ZITO compositions were obtained in a single deposition run by employing a custom-made triangular type of substrate carrier magazine. The effect of various postgrowth annealing atmospheres on the electrical and optical properties of the films were ex-amined. Air, Ar, forming gas (Ar+4 vol% H-2), and successive annealing under forming gas + argon atmo-spheres were studied. Room temperature (RT) deposited films were identified either crystalline or amorphous depending on the location of the substrate on the holder. All these samples exhibited average visible transmittance (T-vis) below 75 % and sheet resistance (R-S) higher than 50 S2/? . Annealing under air atmosphere improved the optical and electrical properties of the films significantly, but not simultaneously for the same composition. Although better optical improvement was achieved by annealing under Ar and increase in electrical conductivity after annealing under forming gas, optimum properties have been ob-tained with the latter condition. T-vis values above 85 % and R-S values below 50 S2/? were attained. On the other hand, successive annealing did not provide any advantage in reaching optimal samples when com-pared to single gas atmosphere annealings. Further, increasing the annealing temperature were found to be beneficial particularly for the conductivity of many compositions. Finally, this study has introduced a systematic approach to produce transparent conductive oxide thin films with reduced indium content that can be suitable for many optoelectronic applications. (C) 2022 Published by Elsevier B.V.
Citation - WoS: 3
Citation - Scopus: 3
Effect of Deposition Parameters on Optical and Electrical Properties of Zno-In2o3 Thin Films
(Elsevier Science Sa, 2023) Can, Hilal Aybike; Öztürk, Tayfur; Akyıldız, Hasan
A combinatorial study was carried out using a magnetron sputtering system to determine suitable ternary compositions of ZnO-In2O3-SnO2 (ZITO) thin films for optoelectronic applications. Samples were obtained on glass substrates via the co-sputtering of high purity oxide targets. Parameters such as the sputtering gas pressure, deposition time and substrate temperature were studied as the process variables and their effects on the composition, optical, and electrical properties of the thin films were examined in detail. The results have revealed that the samples deposited under a sputtering gas pressure of 10 mTorr and deposition time of 45 min in the Zn-rich region presented the best optical properties (max. 84%), whereas In-rich compositions exhibited better electrical properties (min. 14 & omega;/). More specifically, 61.7 at.% Zn, 31.4 at.% In, and 6.9 at.% Sn was determined as the most suitable ZITO composition for various optoelectronic applications. In addition, the in-crease in deposition temperature enhanced the optoelectronic properties of the thin film samples as well as their crystal quality.
Citation - WoS: 7
Citation - Scopus: 6
Processing Optimization of Sio2-Capped Aluminum-Doped Zno Thin Films for Transparent Heater and Near-Infrared Reflecting Applications
(SPRINGER, 2021) Can, Hilal Aybike; Tönbül, Beyza; Pişkin, Fatih; Öztürk, Tayfur; Akyıldız, Hasan
In this study, a series of optimization steps were performed in the production of Al-doped ZnO (AZO) thin films to tailor their properties as efficient transparent heaters and for near-infrared (NIR) reflectance. The films were produced on 50 x 75 mm(2) glass substrates via magnetron sputtering and capped with a protective SiO2 layer. Processing parameters such as deposition temperature, film thickness, and annealing conditions were all optimized in terms of structure, morphology, optical/electrical properties, and heating/deicing behavior. Electro-thermal characteristics of the films were investigated using a thermal imaging infrared camera under various input voltages. The optimized AZO/SiO2 coatings displayed impressive room-temperature electrical conductivity (sigma) of nearly 3774 S/cm with a sheet resistance (R-s) of 3.53 Omega/square, carrier concentration (eta) of 1.14 x 10(21), and Hall mobility (mu) of 20.48 cm(2)/Vs. These films exhibited very high optical transmittance (above 96%) in the visible range and reflectance (73% at 2500 nm) in the NIR region. The highest figure of merit (FOM) was achieved as 237 (x 10(-3) omega(-1)). Deicing tests were performed with samples cooled to - 40 degrees C and resulted with complete removal of ice/water only within 3 min. In addition, the heater exhibited a high surface temperature of 161 degrees C (12 V), a good thermal resistance value (219 degrees C cm(2)/Watts) with stable and reversible heating behavior. More importantly, these results reveal the potential of optimized AZO/SiO2 coatings as alternatives to transparent tin-doped indium oxide heaters and NIR reflecting mirrors for vehicular applications. [GRAPHICS]
Citation - WoS: 24
Citation - Scopus: 25
Solution Processed Aluminum-Doped Zno Thin Films for Transparent Heater Applications
(ELSEVIER SCI LTD, 2021) Tönbül, Beyza; Can, Hilal Aybike; Öztürk, Tayfur; Akyıldız, Hasan
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 optimized heaters were produced on 50 x 75 mm(2) glass substrates at 400 degrees C with 750 nm thickness and annealed under forming gas for 90 min. This sample revealed a good sheet resistance value of 38.7 Omega/square and 83% transmittance in the visible region. Heating/deicing tests showed that the maximum achievable surface temperature was 76 degrees C under an applied potential of 12 V and all ice/water can be removed completely within 250 s. In addition, the AZO heater exhibited a very high thermal resistance value (409 degrees C cm(2)/Watts) with stable and reversible heating behavior.
Citation - WoS: 8
Citation - Scopus: 8
Solution Processed Glass/Fluorine-doped Tin Oxide/Aluminum-doped Zinc Oxide Double Layer Thin Films for Transparent Heater and Near-Infrared Reflecting Applications
(SPRINGER, 2021) Tönbül, Beyza; Can, Hilal Aybike; Öztürk, Tayfur; Akyıldız, Hasan
Double layer glass/fluorine-doped tin oxide (FTO)/aluminum-doped zinc oxide (AZO) multifunctional thin films were achieved via ultrasonic spray pyrolysis (USP) method without employing a post-deposition annealing. Transparent heater and near-infrared heat reflection behaviors were investigated. The samples were characterized in terms of their structural, morphological, optical, and electrical properties. The top AZO layer exhibited a polycrystalline structure without any preferred orientation. The double layer structure showed very high average transmittance (87%, 400-700 nm) in the visible and reflectance (55%, 2500 nm) in the near-infrared, regions. In addition, the sheet resistance and resistivity of the film were measured as 14.85 (Omega sq(-1)) and 1.78 x 10(-3) (Omega cm), respectively. The saturation temperature, response time, surface temperature uniformity, areal power density, and thermal resistance values were found to be 111 degrees C, 174 s, 11.42%, 0.299 W/cm(2), and 282.8 degrees C cm(2) W-1 for a sample with an active area of 31.5 cm(2) and input voltage of 9 V. In addition, dry-ice cooled samples (-25 degrees C) showed impressive deicing performance depending on the input power. In case of 12 V, all ice was defrosted, and water droplets were evaporated within 2 min and 10 s. During this process, a heating rate of similar to 43 degrees C/min was achieved.
ZnO-In2O3-SnO2 Thin Film Transparent Heaters: Tunable Electrothermal Properties Through Substrate Temperature and Postgrowth Annealing
(Konya Teknik Univ, 2025) Kıvrak, Burak; Öztürk, Tayfur; Akyildiz, Hasan; Can, Hilal Aybike
Amorphous thin films of ZnO-In2O3-SnO2 (a-ZITO) were manufactured using magnetron sputtering technique for the applications of thin film transparent heaters (TFTHs). For this purpose, a custom-made 3” sputtering target was prepared with a specific composition in terms of the atomic percentages (at.%) of Zn, In, and Sn cations. The impact of varying substrate temperatures on the characteristics of the samples investigated by depositing the films on glass substrates maintained at room temperature, 150 °C, and 250 °C. To improve the optical and electrical properties, post-growth annealing was carried out under forming gas atmosphere at 400 °C. Structural, morphological, optical, and electrical properties of the samples were thoroughly examined. Electrothermal characterization was performed on samples at room temperature and -40 °C to evaluate response time, saturation temperature, thermal homogeneity, stability, recyclability, thermal resistance, and the defogging/deicing capability of the produced TFTHs. The films produced at 150 °C demonstrated an exceptional electrothermal response, with the thermal resistance calculated to be 181.7 °C·cm²/W under 12 V input. With a measured power density of 0.4635 Watt/cm², this heater was able to melt all ice and evaporate water droplets on the surface within 173 s, indicating a promising performance for commercial defogging/deicing applications.