On the optical properties of SnO2 thin films prepared by sol-gel method

Abstract

Tin oxide (SnO 2 ) thin films are prepared by spin coating onto well-cleaned glass substrates using stannous chloride and methanol solution as complexing agent. Films of different thicknesses are annealed at 400 0 C. Optical properties are studied using UV-Visible spectrophotometer. The films are highly transparent in the visible region. It is found that transmission increases in coated glass (~92%) than uncoated glass. This may find applications in antireflection coating. Energy band gaps obtained are in the range of 4.10-4.12 eV. Refractive index variation with thickness is also studied and is between 1.77-1.91. The thicknesses of the film are of the order 2300, 3500 and 4800 Å. These results have been discussed in the light of literature.

Electrochemical and fluorescence properties of SnO2 thin films and its antibacterial activity

“…The films were then annealed at 350 ˚C and 450 ˚C for 1 hr and then cooled to room temperature. The film thickness was determined by using the standard procedure [27,28]. The average thickness of the films was found about 171 nm.…”

Self-catalytic-grown SnO x nanocones for light outcoupling enhancement in organic light-emitting diodes

“…Additionally, the peak central wavelength of diffuse transmittance was redshifted with the increase of the diameter of the SnO x nanocones, except for the diameter of 1250 nm. This can be explained by the dependence of the incident light scattering on the size of the SnO x particles [6,30,31]. Dielectrical particles illuminated by an electromagnetic plane wave can possess scattering resonances where the wavelength of the light becomes comparable to its diameter d≈λ/n, (called Mie scattering) where λ is the wavelength of light, and n is its refractive index [35][36][37].…”

“…Besides, owing to its nanoscale size, this structure is invisible to the human eye and can be applied to high-resolution displays. Moreover, the refractive index of the SnO x material (∼2.0) is higher than that of the air (∼1.0) [30,31]; thus, the total internal reflection at the air/glass substrate interface can be reduced via strong scattering of the nanostructure with a high refractive index [32][33][34]. The OLEDs with SnO x nanocones exhibited improved efficiency and viewing-angle characteristics.…”