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Tin dioxide is a kind of excellent transparent conductive material. It was the first commercially available transparent conductive material, in order to improve the conductivity and stability, and often mixed use, such as SnO ₂ : Sb, SnO ₂ : F, etc. SnO2 and its doping have tetragonal structure of rutile (tetragonal rutile), as shown. A red O, Sn in black, SnO2 by two Sn and four O atoms, lattice constant is a = b = 0.4737 nm, c = 0.3186 nm, c/a = 0.637. O ^ 2 = 0.140 nm, Sn ^ 4 + = 0.071 nm. SnO2 is n wide bandgap semiconductor, forbidden band width is 3.5 to 4.0 eV, infrared and visible light transmission rate was 80%, the plasma edge is located at 3.2 microns, refractive index > 2, extinction coefficient tends to 0. SnO2 adhesion is strong, and the adhesion strength of the glass and ceramics of 20 mpa, mohs hardness of 7-8, good chemical stability, can withstand chemical etching. SnO2 as conductive film, the main carrier from crystal defect, namely O space and provide electronic doped with impurities. 
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