Zinc oxide thin films by the spray pyrolysis method

Krunks, Malle; Mellikov, E.

doi:10.1016/0040-6090(95)06893-7

Cited by 269 publications

(116 citation statements)

References 4 publications

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“…The wide and direct optical energy band gap of 3.37 eV is large enough to transmit most of the useful solar radiation for ZnO. ZnO is an n-type semiconductor belonging to II -VI group which is very useful for transparent electrodes in flat panel displays, solar cells and a promising material for short wavelength light emitting devices [16][17][18]. Its epitaxial films and nanostructures have been mostly studied for the applications in UV-emitters, solar cells, gas sensors, varistors and surface electro-acoustic wave devices as given by Ozgur et al [19].…”

Section: Introductionmentioning

confidence: 99%

Study of structural, morphological, optical and electroluminescent properties of undoped ZnO nanorods grown by a simple chemical precipitation

Singh¹,

Vishwakarma²

2015

Materials Science-Poland

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In this work, zinc oxide (ZnO) nanorods were obtained by a simple chemical precipitation method in the presence of capping agent: polyvinyl pyrrolidone (PVP) at room temperature. X-ray diffraction (XRD) result indicates that the synthesized undoped ZnO nanorods have hexagonal wurtzite structure without any impurities. It has been observed that the growth direction of the prepared ZnO nanorods is [1 0 1]. XRD analysis revealed that the nanorods have the crystallite size of 49 nm. Crystallite size is calculated by Debye-Scherrer formula and lattice strain is calculated by Williomson-Hall equation. Cell volume, Lorentz factor, Lorentz polarization factor, bond length, texture coefficient, lattice constants and dislocation density have also been studied. We also compared the interplanar spacings and relative peak intensities with their standard values at different angles. The scanning electron microscope (SEM) images confirmed the size and shape of these nanorods. It has been found that the diameter of the nanorods ranges from 1.52 µm to 1.61 µm and the length is about 4.89 µm. It has also been observed that at room temperature ultraviolet visible (UV-Vis) absorption band is around 355 nm (blue shifted as compared to the bulk). The average particle size has also been calculated by mathematical model of effective mass approximation equation, using UV-Vis absorption peak. Finally, the bandgap has been calculated using UV-absorption peak. Electroluminescence (EL) studies show that emission of light is possible at very small threshold voltage and it increases rapidly with increasing applied voltage. It is seen that smaller ZnO nanoparticles give higher electroluminescence brightness starting at lower threshold voltage. The brightness is also affected by increasing the frequency of AC signal.

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Section: Introductionmentioning

confidence: 99%

Study of structural, morphological, optical and electroluminescent properties of undoped ZnO nanorods grown by a simple chemical precipitation

Singh¹,

Vishwakarma²

2015

Materials Science-Poland

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“…Normally aqueous solutions are used, and the process is then referred to as a hydrothermal growth process. Some of the solution-phase synthesis processes include a zinc acetate hydrate (ZAH)-derived nanocolloidal sol-gel route [12], ZAH in an alcoholic solution with sodium hydroxide (NaOH) or tetra methyl ammonium hydroxide (TMAH) [13][14][15], template-assisted growth [16], spray pyrolysis [17,18] and electrophoresis [19] for fabricating nanostructured thin films.…”

Section: Introductionmentioning

confidence: 99%

Growth of ZnO nanowires on nonwoven polyethylene fibers

Baruah

Thanachayanont

Dutta

2008

Science and Technology of Advanced Materials

121

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We report the growth of ZnO nanowires on nonwoven polyethylene fibers using a simple hydrothermal method at a temperature below the boiling point of water. The ZnO nanowires were grown from seed ZnO nanoparticles affixed onto the fibers. The seed ZnO nanoparticles, with diameters of about 6-7 nm, were synthesized in isopropanol by reducing zinc acetate hydrate with sodium hydroxide. The growth process was carried out in a sealed chemical bath containing an equimolar solution of zinc nitrate hexahydrate and hexamethylene tetramine at a temperature of 95 • C over a period of up to 20 h. The thickness and length of the nanowires can be controlled by using different concentrations of the starting reactants and growth durations. A 0.5 mM chemical bath yielded nanowires with an average diameter of around 50 nm, while a 25 mM bath resulted in wires with a thickness of up to about 1 µm. The length of the wires depends both on the concentration of the precursor solution as well as the growth duration, and in 20 h, nanowires as long as 10 µm can be grown. The nonwoven mesh of polyethylene fibers covered with ZnO nanowires can be used for novel applications such as water treatment by degrading pollutants by photocatalysis. Photocatalysis tests carried out on standard test contaminants revealed that the polyethylene fibers with ZnO nanowires grown on them could accelerate the photocatalytic degradation process by a factor of 3.

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“…Here n = 1/2, corresponding to the allowed direct transition [28]. The optical gap was determined from the plot of (αhν) 2 versus photon energy.…”

Section: Resultsmentioning

confidence: 99%

Influence of Thermal Process on Physical Properties of ZnO Films Prepared by Spray Pyrolysis

2014

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ZnO lms were deposited on glass substrates by ultrasonic spray pyrolysis technique at a substrate temperature of 300 ± 5• C. All of the lms have been annealed at 500• C temperature for dierent time (1, 2, and 3 h) to improve the optical, electrical and surface properties. The eect of annealing time on the lms of physical properties has been investigated. UV-Vis spectrophotometer has been used for transmittance measurements. Also, band gap values of the lms have been determined by optical method. Atomic force microscopy has been used to have information the surface morphology and roughness values of the lms. Thicknesses, refractive index and extinction coecient values of the lms have been determined by spectroscopic ellipsometry technique. The electrical conduction mechanisms and resistivity of the lms were investigated using two probe technique. After all the investigations it was concluded that annealing time has a dramatic eect especially on the surface, optical properties and electrical resistivity values of ZnO lms. From the results of these investigations, the application potential of the lms for solar cell devices as transparent electrode was searched.

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Zinc oxide thin films by the spray pyrolysis method

Cited by 269 publications

References 4 publications

Study of structural, morphological, optical and electroluminescent properties of undoped ZnO nanorods grown by a simple chemical precipitation

Study of structural, morphological, optical and electroluminescent properties of undoped ZnO nanorods grown by a simple chemical precipitation

Growth of ZnO nanowires on nonwoven polyethylene fibers

Influence of Thermal Process on Physical Properties of ZnO Films Prepared by Spray Pyrolysis

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