Transparent conductive thin film is an important optoelectronic material, which is widely used in solar cells, flat panel displays, light-emitting diodes and touch screens. The commonly used TCF is to deposit a conductive film on a glass substrate, but the use of glass as a substrate has the disadvantages of strong rigidity and fragility, complex process and high price. It cannot be used in soft occasions, which limits the application of TCF. Flexible TCF is of great significance to promote the miniaturization and lightweight application of electronic devices.
The main components of transparent conductive film include indium tin oxide (ITO) and other materials such as AZO (aluminum-doped zinc oxide).
Application of this type of film
Solar cell transparent conductive film (TCF) is mainly used as a transparent electrode of the battery on the solar cell, and some can also be used as an anti-reflection film at the same time. The requirements for transparent conductive film in solar cells are high carrier concentration, large band gap width, good optoelectronic properties, stable chemical properties, low resistivity, high mechanical strength and excellent wear resistance.
ITO film ITO film is a semiconductor transparent film, which is the abbreviation of the English name of indium tin oxide (indium tin ox ide). Some scholars also call the indium oxide series (In2O 22SnO 2) ITO film. As a transparent conductive electrode, ITO film is required to have good transparency and conductivity.
Emission effect We found that the ITO film treated with cesium has a photoelectric emission effect. Its photoelectric emission is stable, with an integrated sensitivity of 1.71 ua/lm and a life of more than 1,000 hours. The photoelectric emission of this ITO film will greatly promote the development of large-area optoelectronic devices and flat-panel display devices.
In summary, a variety of materials have been used to try to replace ITO. In addition to the above-mentioned carbon nanotubes and graphene transparent conductive films, metal (mainly silver and copper) nanowires as transparent conductive layers have attracted widespread attention from researchers and the industry for their good light transmittance, conductivity, and bending resistance.