Mn doped SnO 2 thin films were prepared by sol-gel dip coating technique. The deposited films on glass substrate were annealed at 300 o C, 400 o C and 500 o C. The effect of annealing temperature on the structure and optical properties of the Mn-SnO 2 thin films have been studied by X-ray diffraction and UV-Vis spectrophotometry. X-ray diffraction studies shows the tetragonal rutile structure of SnO 2 with no additional phases of SnO 2 . Various parameters like crystallite size, lattice

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... s, dislocation density and microstrain have been calculated and found to vary with annealing temperature. The optical transmission spectra shows a red shift in the position of absorption edge towards higher wavelength for Mn-doped thin films but as the annealing temperature increases, the absorption edge shifts toward lower wavelengths. The optical constants and the optical parameters were determined by the spectral transmittance data.