Abstract:Herein we present a comparative study on highly transparent, conductive aluminium-doped ZnO (AZO) thin films deposited by pneumatic spray pyrolysis (PSP) of a zinc acetate based solution and a zinc acetylacetonate based solution on soda lime glass. The structural, optical and electrical properties of the films were studied depending on aluminium content in the precursor solution and substrate temperature during deposition (Ts). The solution used to prepare AZO thin films contained 0.2 M zinc acetate or 0.2 M z… Show more
“…This result is similar to other reported results with AZO thin films grown by other methods. [ 8,13,19,21,23,29,31,32,35,36,39–42,44,47–51,52–58 ]…”
Section: Resultsmentioning
confidence: 99%
“…[ 7,11,12,13,15–17,19,28,30,32–34,38–44,45–51 ] The conductivity and carrier concentration increased with increasing the aluminum, which is similar to other reported results by other methods. [ 8,13,19,21,23,29,31,32,35,36,39–42,44,47–51,52–58 ]…”
Section: Resultsmentioning
confidence: 99%
“…This result is similar to other reported results with AZO thin films grown by other methods. [8,13,19,21,23,29,31,32,35,36,[39][40][41][42]44,[47][48][49][50][51][52][53][54][55][56][57][58] The Hall measurement results are listed in Table 4; from this table, it can be found that the higher value of conductivity and carrier concentration were achieved at 3 wt% doping concentrations as shown in Figure 8…”
Section: Electrical Studymentioning
confidence: 99%
“…[7,11,12,13,[15][16][17]19,28,30,[32][33][34][38][39][40][41][42][43][44][45][46][47][48][49][50][51] The conductivity and carrier concentration increased with increasing the aluminum, which is similar to other reported results by other methods. [8,13,19,21,23,29,31,32,35,36,[39][40][41][42]44,[47][48][49][50][51][52][53][54][55][56]…”
Section: Comparison/significance Of the Current Work Over The Reporte...mentioning
The present work demonstrates the growth of undoped and Al doped ZnO (AZO) thin films by using nonconventional sol-gel method. The structural, morphological, optical, and electrical properties of obtained thin films are studied. X-ray diffraction (XRD) analysis confirms hexagonal wurtzite structures for both undoped and doped thin films. The crystallite size is found between 15 and 30 nm. Scanning electron microscope (SEM) images show that the films have approximately uniform morphologies, consisting in several flower-like aggregates with nanosized multipetals. From the optical properties, it is found that with the increase in the doping concentration, there is a decrease in the absorption coefficient in the visible wavelength range. It is also noticed that the increase in doping concentration causes an increase in bandgap (E g ) and a decrease in extinction coefficient. Urbach energy decreases with increase in the doping concentration. In the Hall effect study, it is observed that the conductivity and carrier concentration increase sharply with increasing the aluminum quantity. The causes and significance of these observations are discussed.
“…This result is similar to other reported results with AZO thin films grown by other methods. [ 8,13,19,21,23,29,31,32,35,36,39–42,44,47–51,52–58 ]…”
Section: Resultsmentioning
confidence: 99%
“…[ 7,11,12,13,15–17,19,28,30,32–34,38–44,45–51 ] The conductivity and carrier concentration increased with increasing the aluminum, which is similar to other reported results by other methods. [ 8,13,19,21,23,29,31,32,35,36,39–42,44,47–51,52–58 ]…”
Section: Resultsmentioning
confidence: 99%
“…This result is similar to other reported results with AZO thin films grown by other methods. [8,13,19,21,23,29,31,32,35,36,[39][40][41][42]44,[47][48][49][50][51][52][53][54][55][56][57][58] The Hall measurement results are listed in Table 4; from this table, it can be found that the higher value of conductivity and carrier concentration were achieved at 3 wt% doping concentrations as shown in Figure 8…”
Section: Electrical Studymentioning
confidence: 99%
“…[7,11,12,13,[15][16][17]19,28,30,[32][33][34][38][39][40][41][42][43][44][45][46][47][48][49][50][51] The conductivity and carrier concentration increased with increasing the aluminum, which is similar to other reported results by other methods. [8,13,19,21,23,29,31,32,35,36,[39][40][41][42]44,[47][48][49][50][51][52][53][54][55][56]…”
Section: Comparison/significance Of the Current Work Over The Reporte...mentioning
The present work demonstrates the growth of undoped and Al doped ZnO (AZO) thin films by using nonconventional sol-gel method. The structural, morphological, optical, and electrical properties of obtained thin films are studied. X-ray diffraction (XRD) analysis confirms hexagonal wurtzite structures for both undoped and doped thin films. The crystallite size is found between 15 and 30 nm. Scanning electron microscope (SEM) images show that the films have approximately uniform morphologies, consisting in several flower-like aggregates with nanosized multipetals. From the optical properties, it is found that with the increase in the doping concentration, there is a decrease in the absorption coefficient in the visible wavelength range. It is also noticed that the increase in doping concentration causes an increase in bandgap (E g ) and a decrease in extinction coefficient. Urbach energy decreases with increase in the doping concentration. In the Hall effect study, it is observed that the conductivity and carrier concentration increase sharply with increasing the aluminum quantity. The causes and significance of these observations are discussed.
Zinc oxide is an environmentally friendly and readily synthesized semiconductor with many industrial applications. ZnO powders were prepared by alkali precipitation using different [Zn(acetate)2(amine)x] compounds to alter the particle size and aspect ratio. Slow precipitations from 95 °C solutions produced micron-scale particles with morphologies of hexagonal plates, rods, and needles, depending on the precursor used. Powders prepared at 65 °C with rapid precipitation yielded particles with minimal morphology differences, but particle size was dependent on the precursor used. The smallest particles were produced using precursors that yielded crystals with low aspect ratios during high-temperature synthesis. Particles produced during rapid synthesis had sizes ranging from 21–45 nm. The materials were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, thermogravimetric analysis, BET, and diffuse reflectance. The materials prepared using precursors with less-volatile amines were found to retain more organic material than ZnO produced using precursors with more volatile amines. The amount of organic material associated with the nanoparticles influenced the photocatalytic activity of the ZnO, with powders containing less organic material producing faster rate constants for the decolorizing of malachite green solutions under ultraviolet illumination, independent of particle size. [Zn(acetate)2(hydrazine)2] produced ZnO with the fastest rate constant and was recycled five times for dye degradation studies that revealed minimal to no reduction in catalytic efficiency.
In this work, ZnO thin films grown on heated glass substrates in a temperature range of 300 to 500 °C with a 50°C step. The prepared solution is composed of methanol and zinc acetate Zn(CH3COO)2.2H2O. ZnO thin films are deposited by pyrolysis spray technique, our work focuses on the study of the substrate temperature influence on the structural and optical properties of these layers. Therefore, The X-ray diffraction, showed a Wurtzit hexagonal structure of elaborated films, with (002) as a preferred orientation, and a grain size of 64 to 74 nm. The optical transmission spectroscopy UV-Visible, illustrated an increase of optical band gap from 3.19 to 3.25 eV, proportionally with the substrate temperature.
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