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1 2006

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Aquo-organic sol based F-doped SnO2 (Sn : F = 90 : 10) coatings on glass

Biswas P.K., Dua L., Chaudhuri A.de T.

Materials Science Poland

2006

Vol. 24, No. 2/1

367--374

Aqueous precursor of F-doped SnO2 was prepared starting with hydrated Sn (IV) chloride, ammonium fluoride and water. Polyvinyl alcohol (Mol. Wt, 22000), a sol stabilizer was used for better adherence to glass substarte. Both the dipping and the spinning techniques were used to deposit layers of different thicknesses (200 to 650 š 10 nm). Air drying and subsequent curing at ~ 450°C in air yielded tetragonal cassiterite phase of SnO2 along with tetragonal Sn phase. Percentage of visible transmission of the spin coated samples was relatively high (~ 80 %). Incorporation of polyvinyl alcohol in the aqueous precursor minimized etching phenomenon by fluoride ion as revealed by the SEM pictures. Surface of the developed films seemed to be porous; the spin coated sample was relatively less porous. Refractive index (R.I.) of the dip coated samples was relatively smaller (range, 1.650 - 1.803) while the spin coated samples had the R. I. values in the range 1.670-1.823. Sheet resistance of the spin coated films was in the range, 3.3-1300 k? / while it was 1.4 - 2500 k? / in the case of dip coated samples.