scholarly journals Enhanced Sol–Gel Route to Obtain a Highly Transparent and Conductive Aluminum-Doped Zinc Oxide Thin Film

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1744 ◽  
Author(s):  
Mohammad Hossein Nateq ◽  
Riccardo Ceccato
Keyword(s):  
Zinc Oxide ◽  
Optical Properties ◽  
Sol Gel ◽  
Nir Spectroscopy ◽  
Optical Transmittance ◽  
Oxide Thin Film ◽  
Dta Analysis ◽  
Grain Boundary Characteristics ◽  
Aluminum Doped Zinc Oxide ◽  
Boundary Characteristics

The electrical and optical properties of sol–gel derived aluminum-doped zinc oxide thin films containing 2 at.% Al were investigated considering the modifying effects of (1) increasing the sol H2O content and (2) a thermal treatment procedure with a high-temperature approach followed by an additional heat-treatment step under a reducing atmosphere. According to the results obtained via the TG-DTA analysis, FT-IR spectroscopy, X-ray diffraction technique, and four-point probe resistivity measurements, it is argued that in the modified sample, the sol hydrolysis, decomposition of the deposited gel, and crystallization of grains result in grains of larger crystallite size in the range of 20 to 30 nm and a stronger c-axis preferred orientation with slightly less microstrain. The obtained morphology and grain-boundary characteristics result in improved conductivity considering the resistivity value below 6 mΩ·cm. A detailed investigation of the samples’ optical properties, in terms of analyzing their absorption and dispersion behaviors through UV-Vis-NIR spectroscopy, support our reasoning for the increase of the mobility, and to a lesser extent the concentration of charge carriers, while causing only a slight degradation of optical transmittance down to nearly 80%. Hence, an enhanced performance as a transparent conducting film is claimed for the modified sample by comparing the figure-of-merit values.

scholarly journals Enhanced Sol-Gel Route to Obtain a Highly Transparent and Conductive Aluminum-doped Zinc Oxide Thin Film

2019 ◽  
Author(s):  
Mohammad Hossein Nateq ◽  
Riccardo Ceccato
Keyword(s):  
Zinc Oxide ◽  
Optical Properties ◽  
Sol Gel ◽  
Resistivity Measurement ◽  
Nir Spectroscopy ◽  
Charge Carriers ◽  
Oxide Thin Film ◽  
Mobility Of Charge Carriers ◽  
Dta Analysis ◽  
Grain Boundary Characteristics

The electrical and optical properties of sol-gel derived aluminum-doped0 zinc oxide thin films containing 2 at.% Al were investigated considering the modifying effects of 1) increasing the sol H2O content; and 2) thermal treatment procedure with high-temperature approach followed by an additional heat-treatment step under a reducing atmosphere. According to the results obtained via the TG-DTA analysis, FT-IR spectroscopy, X-ray diffraction technique and four-point probe resistivity measurement, it is argued that the sol hydrolysis, decomposition of the deposited gel and crystallization of grains result in grains of larger crystallite size and stronger c-axis preferred orientation with slightly less microstrain in the modified sample. The consequent morphology and grain-boundary characteristics turn out as improved conductivity, implying higher values of concentration and mobility of charge carriers. A detailed investigation on samples optical properties, in terms of analyzing their absorption and dispersion behaviors through the UV-Vis-NIR spectroscopy, support our reasoning for the increase of the mobility, and to a lesser extent, the concentration of charge carriers, while causing only a slight degradation of optical transmission. Hence, an enhanced performance as a transparent conducting film is claimed for the modified sample by comparing the figure-of-merit values.

Effect of Oxygen Annealing on the Electrical and Optical Properties of Zinc Oxide Thin Film

2015 ◽  
Vol 1109 ◽  
pp. 598-602 ◽  
Author(s):  
Mohd Nizar Zainol ◽  
Shafinaz Sobihana Shariffudin ◽  
Mohamad Hafiz Mamat ◽  
Mohamad Rusop
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Optical Properties ◽  
Electrical Properties ◽  
Metal Oxide ◽  
Sol Gel ◽  
Optical Transmittance ◽  
Oxide Thin Film ◽  
Oxygen Annealing ◽  
Effect Of Oxygen

This paper presents on the effect of oxygen annealing on the electrical properties and optical properties. Sol gel spin coating is used to deposit zinc oxide thin films on glass substrates to obtain the uniform thin films. Here, the ZnO thin films were annealed in oxygen environment with various oxygen concentration of 20 to 40 sccm. This metal oxide has shown its ability as a very high optical transmittance which at 20 sccm thin films give the highest transmittance that is 97.44% and at 40 sccm thin films give the lowest transmittance that is 87.61%. Next, this metal oxide also has shown its ability in fairly good electrical properties which the lowest resistivity at 40 sccm thin films is 1.61× 104 Ωcm-1.

Optical Properties and Morphology of Al Doped Zinc Oxide Thin Film Exposed on Wet and Dry Conditions

2013 ◽  
Vol 667 ◽  
pp. 272-276
Author(s):  
S.A. Razali ◽  
Mohamad Hafiz Mamat ◽  
M.N. Berhan ◽  
Mohamad Rusop Mahmood
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Optical Properties ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Optical Transmittance ◽  
Band Gap Energy ◽  
Oxide Thin Film ◽  
Average Optical Transmittance ◽  
Dry Conditions

The optical properties and morphology of Aluminum (Al) doped Zinc Oxide (ZnO) thin films prepared by sol-gel method have been investigated. The thin films were prepared at annealing temperature of 550 OC and have been exposed under wet and dry conditions. UV-Vissmeasurements have been carried out to investigate the optical properties while Scanning Electron Microscope (SEM) to investigate morphology. The grain size of films was increased with increased annealing temperature. The average optical transmittance became about 80% in the visible and had sharp ultraviolet absorption edges at 380 nm. The absorption edge analysis revealed that the optical band gap energy for the films was ~ 3.26 eV. The surface morphology in increasing annealing temperature has a big size and less porosity between particles.

scholarly journals Thermal Effect on the Structural, Electrical, and Optical Properties of In-Line Sputtered Aluminum Doped Zinc Oxide Films Explored with Thermal Desorption Spectroscopy

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Shang-Chou Chang ◽  
Tien-Chai Lin ◽  
To-Sing Li
Keyword(s):  
Zinc Oxide ◽  
Optical Properties ◽  
Thermal Effect ◽  
Thermal Desorption ◽  
Thermal Desorption Spectroscopy ◽  
Optical Transmittance ◽  
Device Fabrication ◽  
Electrical And Optical Properties ◽  
Different Temperatures ◽  
Aluminum Doped Zinc Oxide

This work investigates the thermal effect on the structural, electrical, and optical properties of aluminum doped zinc oxide (AZO) films. The AZO films deposited at different temperatures were measured using a thermal desorption system to obtain their corresponding thermal desorption spectroscopy (TDS). In addition to obtaining information of thermal desorption, the measurement of TDS also has the effect of vacuum annealing on the AZO films. The results of measuring TDS imply part of the doped aluminum atoms do not stay at substituted zinc sites in AZO films. The (002) preferential direction of the AZO films in X-ray diffraction spectra shifts to a lower angle after measurement of TDS. The grain size grows and surface becomes denser for all AZO films after measurement of TDS. The carrier concentration, mobility, and average optical transmittance increase while the electrical resistivity decreases for AZO films after measurement of TDS. These results indicate that the AZO films deposited at 200°C are appropriate selections if the AZO films are applied in device fabrication of heat-produced process.

scholarly journals Properties of aluminum doped zinc oxide thin film by sol-gel process

2007 ◽  
Author(s):  
Sung-Hak Yi ◽  
Seung-Kyu Choi ◽  
Jae-Min Jang ◽  
Jung-A Kim ◽  
Woo-Gwang Jung
Keyword(s):  
Thin Film ◽  
Zinc Oxide ◽  
Sol Gel ◽  
Oxide Thin Film ◽  
Zinc Oxide Thin Film ◽  
Sol Gel Process ◽  
Aluminum Doped Zinc Oxide
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