An ITO window has a property of low sheet resistance and high transmittance. It is mostly used in research and development. ITO coated Window substrates are widely used to organic/inorganic heterojunction solar cells, Schottky solar cells, CdTe solar cells and other various thin film solar cells as transparent semiconductor oxide electrode materials since their transparency and high conductivity.
Transmittance Spectrum
The Indium tin oxide coated Window is one of the types of transparent conductive oxide (TCO) coated substrates. It is commonly known as ITO coated Window. The ITO coated Window having excellent conductive and high transmittance properties. The ITO Window is an N-type semiconductor. The chemical formula of Indium tin oxide is Sn:In2O3. The uniform thin layer of Indium tin oxide (ITO) over a Window substrate makes it highly transparent and low surface resistance. The ITO coating over a Window sheet is carried out in the entirely vacuumed condition by magnetron sputtering method at around 300 degree C. It is a single side coating, where coated surface is conductive, and another surface is insulated. In this approach, there is passivation layer of silicon dioxide (SiO2) in between ITO layer and borosilicate glass surface. The standard thickness of SiO2 is 25 nm. The passivation layer is essential to increase the quality as well as longevity of ITO coated Window plate. The borosilicate Window or float glass is a single side finished substrate. The maximum operating temperature of ITO coated Window slide is 350 degree Celsius (i.e. 662 0Fahrenheit).
ITO Coated Window Applications
Digital microfluidic devices
Display and other Optoelectronic devices
Solar cell fabrication
As substrates for Barium Vanadate films
EMF/EMI/EMC/RFI/HF Shielding applications
Flat antennas for mobile communication
De-icing applications
ITO glass heater and antistatic windows
ITO defrosting coating use for aerospace technology
Use in camera and Spectro-electrochemistry
Organic Light Emitting Diode [OLED] and Electro- Luminescent Display [ELD]
Photovoltaic cell making
Switchable Windows
Biological devices and use as a cell culture substrate
Display technology such as LCD, Plasma Display, Flat Panel Display
Sheet Resistance vs Transmittance vs ITO Layer Thickness
Design of ITO Coated Window
The Indium Tin Oxide conductivity depends on the surface resistance, which is reciprocal to conductivity. The specified surface resistivity of the ITO coated Window is in the range of 10 ohms/sq. to 100 ohms per square. The transmittance of the Indium Tin Oxide (ITO) Window coverslips at 550nm are greater than 85%. The ITO film or layer thickness is in the range of 50nm to 200nm (i.e. 500Å – 2000Å). The surface roughness is 1-10 nm depending on their specifications, whereas the ITO work function is 4.8~4.9eV after a proper cleaning. It is also known as ITO wafer. The haze of the conductive glasses is less than 1%.
Shape Optics can provide precision ITO window for many applications, if you need customised window, do contact us.
