ITO Glass Of Key LCD Material
- Apr 18, 2018 -

             

ITO glass In the oxide conductive film, the Sn-doped In2O3 (ITO) film has the highest transmittance and the best conductivity, and it is easy to etch a fine pattern in the acid liquid. Its transmittance has reached more than 90%. The transmittance and resistance of ITO are controlled by the ratio of In2O3 to Sn2O3, usually SnO2:In2O3=1:9.


   ITO is an N-type oxide semiconductor-Indium Tin Oxide. ITO thin film is an indium tin oxide semiconductor transparent conductive film. There are usually two main performance indicators: resistivity and light transmittance.


   At present, the resistivity of ITO film is generally about 5*10-4, preferably up to 5*10-5, which is close to the resistivity of metal. In practical applications, the sheet resistance is often used to characterize the conductive properties of ITO. The transmittance can reach over 90%. The transmittance and resistance of ITO film are controlled by the ratio of In2O3 and Sn2O3, respectively. Increasing the ratio of yttrium can increase the transmittance of ITO, usually Sn2O3: In2O3=1:9. Since the thickness of tin oxide exceeds 200 Å, the transparency is usually not good enough although the conductivity is good.


   ITO has free ions on the surface and is prone to redox reactions and ITO corrosion when it is powered on. Therefore, we do not have to touch the electrode of the LCD with bare hands because the halogen (cl element) contained in human sweat is the natural enemy of ITO.