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Title: Effect of annealing on properties of transparent conducting tin oxide films deposited by thermal evaporation
Authors: Singh, Beer Pal
Kumar, Rakesh
Kumar, Ashwani
Gaur, Jyotshana
Singh, Sunder Pal
Tyagi, R C
Keywords: Transparent conducting coating;Thermal evaporation;Annealing, SnO2;Optical spectra;XRD;SEM;EDAX
Issue Date: Aug-2013
Publisher: NISCAIR-CSIR, India
Abstract: The surface morphology, structural characteristics and optical properties of the transparent conducting SnO2 films deposited by vapour deposition of SnCl2.2H2O on heated glass substrate have been evaluated by X-ray diffraction, scanning electron microscopy, EDAX analysis and spectro-photometric examination. The ‘as deposited’ films of tin oxide were found to be polycrystalline, adhesive and pin hole free. After annealing at a higher temperature, these films exhibited an improved crystalline surface morphology and also displayed random perforations having a dendrite structure. It is found that heat treatment of the ‘as deposited’ tin oxide films results in conversion of the SnO component into SnO2 phase which resulted in a better transparency, larger crystallite size and reduced film thickness due to diffusion of tin into the matrix of the glass substrate thereby making the film more suitable for device applications. The increased porosity of ‘annealed’ films provides more surface area for use as sensors and also makes them less likely to fracture when used as high temperature electrodes.
Page(s): 558-562
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.51(08) [August 2013]

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