The influence of the precursor concentration on the properties of SnO2 thin films (original) (raw)
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Thin Solid Films, 2011
The paper presents a comparative analysis of the SnO 2 thin layers, obtained via spray pyrolysis deposition (SPD), using polymeric precursors with different compositions and concentrations. The changes in the crystalline structure (X-ray diffraction), morphology and surface energy (atomic force microscopy and contact angle) and electric (electrical conductivity) properties of the layers were investigated. The photocatalytic efficiency of the samples was tested considering these layers' future applications in removing organic pollutants.
Materials Today: Proceedings, 2016
In the present contribution a simplistic synthesis of SnO 2 thin film on ultrasonically cleaned soda-lime glass is outlined. Precursor solution of strength 0.1 M, 0.2 M and 0.3 M are used for the synthesis using a homemade affordable spray pyrolysis technique. An elaborate structural analysis is carried from the X-Ray diffraction data. The structural analysis is supported by the transmission electron microscopy micrograph and selected area electron diffraction pattern. The crystallite sizes are below 50 nm that makes the films suitable for nano-material application. Formation of texture is observed which indicates the preferred orientation to be the (101) plane. In comparison to techniques like pulsed laser deposition, spray pyrolysis provides better results for certain applications. The morphology of the thin films is investigated using atomic force microscopy. It revealed the control of application dependent roughness of the sample by variation of molarity of the precursor solution. Also the film is uniformly spread throughout the substrate. The optical properties are studied by UV-Visible spectroscopy that further confirms formation of nano-structures. Preliminary electrical investigation of the thin films is done by using a two probe semiconductor characterization system and is correlated with UV-Visible result. Impedance analysis showed that with higher molarity the impedance remains constant and the barrier height remains fixed for high frequency which predicts that the films can be used for rectifying applications.
Electrical, structural and optical properties of SnO 2 thin films prepared by spray pyrolysis
Journal of Non-crystalline Solids, 2006
This study investigated the effect of the substrate temperature on the structural, optical, morphological, and electrical properties of undoped SnO 2 films prepared by a spray deposition method. The films were deposited at various substrate temperatures ranging from 300-500°C in steps of 50°C and characterized by different optical and structural techniques. X-ray diffraction studies showed that the crystallite size and preferential growth directions of the films were dependent on the substrate temperature. These studies also indicated that the films were amorphous at 300°C and polycrystalline at the other substrate temperatures used. Infrared and visible spectroscopic studies revealed that a strong vibration band, characteristic of the SnO 2 stretching mode, was present around 630 cm À1 and that the optical transmittance in the visible region varied over the range 75-95% with substrate temperature, respectively. The films deposited at 400°C exhibited the highest electrical conductivity property.
2 (SnO Structural Properties of Films Deposited By Spray Pyrolysis Technique
— Nano structure of mixed (SnO2)1-x(ZnO)x thin films were prepared by spray pyrolysis technique at a substrate temperature of 400°C. The films deposited were 190 nm thickness. The XRD analysis for its structural characteristic has been performed. The average grain size was found to be between 21.27 and 15.80 nm.AFM Atomic Force microscope gives good information about the surface topography of the film.It is understood that the crystallinity of SnO2increases with increasing ZnO Vol.%. Keywords— Spray pyrolysis, tin oxide, zinc oxide, structural properties, and thin films.
Structural and optical analysis of SnO2 thin films BY Spray Pyrolysis
2020
Received : dd/mm/yyyy Accepted : dd/mm/yyyy Abstract: SnO2 thin films were deposited by ultrasound pyrolysis spray technique at 450°C. The films were characterized by X-ray diffraction, Fourier transformed infrared (FTIR), ultraviolet–visible and Photoluminescence spectroscopy. The tetragonal rutile-type structure was confirmed by X-ray diffraction with an average crystallite size of 35 nm. In addition, the FTIR study indicated the existence of two distinct characteristic absorptions which correspond to (0-Sn-O) deformations and (O-Sn) stretching modes. For the optical properties, the band gap energy was determined by WempleDiDomenico model. PL properties are ascribed to the presence of intrinsic defects.
Optoelectronic properties of SnO 2 layers obtained by SPD and ECD techniques
Thin Solid Films, 2010
The paper presents a comparative approach concerning the properties of SnO 2 thin layers obtained via spray pyrolysis deposition (SPD) and electro-chemical deposition (ECD). The influences of crystalline structure (X-ray diffraction), morphology (atomic force microscopy, contact angle) on the electric (electrical conductivity) properties of the layers were studied. The SPD samples present a porous morphology with high surface energy compared with ECD samples characterized by a dense morphology. The photocatalytic efficiency of the samples was tested in the photodegradation of methylene blue and the higher values (57%) correspond to SPD samples.
Journal of Alloys and Compounds, 2015
Recently metal oxide thin films are extensively investigated because of their potential applications in solar energy conversion. In the present paper, Transparent conducting antimony doped tin oxide (Sb:SnO 2) thin films have been deposited by spray pyrolysis technique at various antimony doping concentrations from non-aqueous solvent Propan-2-ol. XRD studies show that all films are polycrystalline with tetragonal crystal structure. The crystallite size observed is in the range 29e37 nm for various Sb doping concentrations. The surface morphology of Sb:SnO 2 thin film is spherical with the continuous distribution of grains. The average transmittance of the undoped and Sb:SnO 2 thin films, measured in the 450e850 nm wavelength is ranging between 70 and 95%. The best results are obtained at 1.5 wt.% Sb doping concentration, which are direct band gap of 3.82 eV, minimum sheet resistance of 5.7 U/cm 2 , lowest resistivity of 3.76 Â 10 À4 U-cm, carrier concentration and mobility of 4.46 Â 10 19 cm À3 and 372 cm 2 V À1 s À1 , respectively.
Thin Solid Films, 2008
Tin dioxide thin films on glass substrate with different Zn doping levels were obtained by spray pyrolysis. Their microstructure, preferred crystallographic orientation, electrical and optical properties were extensively studied. The characterization techniques employed were scanning electron microscopy, transmission electron microscopy, atomic force microscopy, X-ray diffraction, electrical conductivity and optical transmission measurements. It was found that the material obtained has a nano-scale texture which characteristic size and orientation strongly depend on the Zn doping level. Doping-induced variations in texture and structure modify both the electrical and optical properties of films (namely, refractive index and transparency). The results obtained are relevant for potential applications of the studied films in gas sensing and photoconductive devices.
Nanocrystalline Tin Oxide SnO2 thin films have been grown on cleaned glass substrates at 450 C ○ using spray pyrolysis deposition technique, prepared from two precursor solutions SnCl2.2H2O and SnCl4.5H2O.The XRD analyses showed that these films have polycrystalline in nature with tetragonal rutile structure with preferred orientation of (110),(200),(211) and the crystalline size (grain size) of thin films are found to vary from 32.6 to 56.98 nm .