Abstract
Cadmium stannate (Cd2SnO4) thin films were coated on Corning 1737 glass substrates at 540°C by spray pyrolysis technique, from the aqueous solution of cadmium acetate and tin (II) chloride precursors. Fluorine doped Cd2SnO4 (F: Cd2SnO4) thin films were prepared by adding ammonium fluoride in the range of 0–5wt% of the total weight of cadmium acetate and tin (II) chloride in the spray solution. Thickness of the prepared films is about 300nm. X-ray diffraction analysis of the Cd2SnO4 and 3wt% F: Cd2SnO4 films shows the signature for the growth along (222) direction. Scanning electron micrographs showed that fluorine doping effectively modifies the surface morphology of Cd2SnO4 films. Average optical transmittance in the visible region (500–850nm) for Cd2SnO4 is ~79% and it is increased to ~83% for 1wt% doping concentration of the NH4F in the solution. Fluorescence spectra of F: Cd2SnO4 (1wt% and 3wt%) exhibit peak at 601nm. F: Cd2SnO4 film (1wt%) shows mobility of ~42cm2/Vs, carrier concentration of ~9.5×1019cm−3 and resistivity of ~1.5×10−3Ωcm.
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