What does ITO mean in chemistry?

Chemically speaking, ITO is an abbreviation for Indium Tin Oxides.

As a nano indium tin metal oxide, it has excellent electrical conductivity and transparency and can cut off electron radiation, ultraviolet rays and far infrared rays harmful to the human body. Therefore, indium tin oxide is usually sprayed on glass, plastic and electronic display screens, used as a transparent conductive film, while reducing the harmful electronic radiation, ultraviolet and infrared. Indium tin oxide sputtering target is the essential material for producing ITO film.

The real work on ITO film was at the end of the 19th century when a very thin metal film was obtained on the photoconductive material. Research on transparent conductive materials has entered a new era during the Second World War, mainly used in aircraft de-icing window glass. In 1950, the second transparent semiconductor oxide In2O3 was first fabricated. After the incorporation of tin in In2O3, this material becomes widely used in transparent conductive films and has broad application prospects.

Among the ITO conductive films, the Sn-doped In2O3 (ITO) film has the highest transmittance and the best electrical conductivity, and it is easy to etch a fine pattern in the acid solution, wherein the light transmittance is over 90%.

At present, the resistivity of the ITO film layer is generally about 5*10E-4, preferably up to 5*10E-5, which is close to the resistivity of metal. The transmittance and resistance of the ITO film are controlled by the ratio of In2O3 and SnO2, respectively. Increasing the ratio of indium oxide can increase the transmittance of ITO, usually SnO2: In2O3=1:9. Since the thickness of tin oxide exceeds a certain degree, the transparency is usually not good enough - although the conductivity is good.

With the rapid development of the display device industry, new requirements have been placed on the product performance characteristics of ITO films. At the same time, the in-depth development of ITO film preparation technology has made the needs of display devices possible.

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