Indium Tin Oxide, ITO
Indium Tin Oxide (ITO) is the industry-standard transparent conducting oxide, combining high visible-light transmittance with low electrical resistivity in a single ceramic film. Supplied by Infinita Materials as dense, high-purity sputtering targets, ITO is the material of choice for touchscreens, flat-panel displays, and transparent electrode applications worldwide. Our targets are sintered to controlled density and grain structure for stable, low-particulate deposition on production coaters. Available in standard disc and custom rectangular or rotary geometries across multiple purity grades.
| Purity (%) : | >99.9 |
| Dimensions : | Dia. 1”, Thick. 0.125” Dia. 2”, Thick. 0.25” |
Introduction to Indium Tin Oxide
Indium tin oxide is a transparent conducting oxide based on In₂O₃ doped with SnO₂, typically around 90:10 by weight. Sn⁴⁺ substitution introduces free carriers and oxygen vacancies, giving ITO its combination of high electrical conductivity and excellent visible-light transparency. As a sputtering target, ITO enables dense, uniform, and adherent films with precise thickness and sheet-resistance control. DC or pulsed-DC magnetron sputtering is commonly used for conductive targets, while RF is suitable for less-conductive compositions. Sputtered ITO films are widely used as transparent electrodes in touchscreens, LCD and OLED displays, thin-film photovoltaics, and low-emissivity glass, where high transparency and low resistance are essential.
FAQs
Question: How is Indium Tin Oxide used in sputtering targets?
Answer: In sputtering targets, A. Indium Tin Oxide (ITO) is a ceramic material composed of indium oxide and tin oxide. It deposits transparent, conductive thin films on substrates, essential for applications like touchscreens, displays, and solar cells.
Question: Why is ITO crucial in optoelectronics?
Answer: Owing to its distinct properties of optical clarity coupled with high electrical conductivity, ITO finds application in numerous devices, such as touch screen panels, light-emitting diodes, photovoltaic devices, and many others.
Question: Why is ITO used in intelligent windows?
Answer: ITO coatings on such surfaces can efficiently control the amount of light and energy transmitted through them, aiding in energy conservation within rural and urban buildings by allowing visible light in while blocking UV and IR radiation.
Introduction to Indium Tin Oxide
Indium tin oxide is a transparent conducting oxide based on In₂O₃ doped with SnO₂, typically around 90:10 by weight. Sn⁴⁺ substitution introduces free carriers and oxygen vacancies, giving ITO its combination of high electrical conductivity and excellent visible-light transparency. As a sputtering target, ITO enables dense, uniform, and adherent films with precise thickness and sheet-resistance control. DC or pulsed-DC magnetron sputtering is commonly used for conductive targets, while RF is suitable for less-conductive compositions. Sputtered ITO films are widely used as transparent electrodes in touchscreens, LCD and OLED displays, thin-film photovoltaics, and low-emissivity glass, where high transparency and low resistance are essential.
Key Properties of Indium Tin Oxide
| Property | Value | Significance |
|---|
| Chemical composition | In2O3-SnO2, standard 90:10 wt% ratio | Sets the balance between carrier concentration and optical transparency in the deposited film |
| Crystal structure | Cubic bixbyite (In2O3 host lattice with substitutional Sn4+) | Determines sputter yield, grain morphology, and target density achievable during sintering |
| Density (theoretical) | ~7.14 g/cm3 | Higher sintered relative density improves target conductivity and reduces arcing during DC sputtering |
| Film resistivity (as-deposited) | ~1-2 x 10^-4 ohm-cm typical | Directly governs sheet resistance and power efficiency of the finished transparent electrode |
| Visible light transmittance | ~85-90% | Core property enabling use as a transparent electrode over the visible spectrum |
| Work function | ~4.7-4.8 eV | Affects charge-injection efficiency at ITO/organic or ITO/semiconductor interfaces in OLEDs and solar cells |
| Melting/decomposition point | ~1800 C | Confirms thermal stability of the ceramic target under sputter power loading and bake-out cycles |
| Thermal conductivity | ~3.5 W/(m K) | Influences target cooling requirements and resistance to thermal-shock cracking during sputtering. |
Types & Grades of Indium Tin Oxide
Indium Tin Oxide targets are offered in standard catalogue sizes and grades, with custom purity, density, and geometry available for OEM and R&D deposition systems.
| Grade / Form | Typical Purity | Key Features / Uses |
|---|
| Standard planar target, 3N | 99.9% | General-purpose grade for LCD electrodes, ESD coatings, and cost-sensitive touch panels |
| High-purity planar target, 4N | 99.99% | Lower defect density and fewer particulates for high-end OLED and premium display electrodes |
| Ultra-high-purity target, 5N | 99.999% | Reserved for research-grade films and precision optical coatings requiring minimal trace-metal contamination |
| Rotary/cylindrical target | 99.9% – 99.99% | High material utilisation on large-area in-line coaters for architectural glass and large-format displays |
| Custom-ratio and segmented targets | Varies by specification | Tailored In2O3:SnO2 ratios or bonded/segmented formats for non-standard resistivity or transmittance targets |
Applications of Indium Tin Oxide
Sputtered films of Indium Tin Oxide support demanding roles across research and production applications where this material’s specific structural, electronic, or optical properties are the key requirement.
| Industry | Application | Function |
|---|
| Consumer electronics | Capacitive touchscreen sensors | Forms the transparent conductive grid that senses touch input |
| Display manufacturing | LCD and OLED pixel electrodes | Transparent conductive layer for driving and addressing individual pixels |
| Photovoltaics | Thin-film and heterojunction solar cells | Transparent front-contact electrode that admits light while collecting current |
| Architectural and automotive glass | Low-emissivity and smart windows | Reflects infrared heat while transmitting visible light for energy-efficient glazing |
| Automotive | Defrosting glass and EMI-shielded canopies | Transparent resistive heating element and electromagnetic shielding layer |
| Aerospace and instrumentation | EMI-shielded viewing windows and sensor coatings | Transparent conductive shield that blocks electromagnetic interference without blocking vision |
Why Partner with Infinita Materials?
- Technical Depth: in-house quality control with ICP-MS and XRF purity verification, density measurement, and full certificates of analysis on every target.
- Global Logistics: reliable supply from single R&D-scale targets to production-line volumes, with established international shipping.
- Responsive Support: direct access to materials engineers for grade, bonding, and geometry selection, and process-compatibility questions.
Take the Next Step
Infinita Materials fabricates Indium Tin Oxide sputtering targets engineered to the purity, density, and geometry your deposition process requires. Whether the requirement is a standard catalogue target or a custom size, purity, or bonded assembly, our team can help match the right specification to your deposition system. Request a quote or speak with our technical team to discuss your target specification.
Frequently Asked Questions
How is Indium Tin Oxide used in sputtering targets?
In sputtering targets, A. Indium Tin Oxide (ITO) is a ceramic material composed of indium oxide and tin oxide. It deposits transparent, conductive thin films on substrates, essential for applications like touchscreens, displays, and solar cells.
Why is ITO crucial in optoelectronics?
Owing to its distinct properties of optical clarity coupled with high electrical conductivity, ITO finds application in numerous devices, such as touch screen panels, light-emitting diodes, photovoltaic devices, and many others.
Is ITO a ferroelectric material?
ITO is not an organic material; hence, it possesses no ferroelectric properties. It is used purely to conduct electricity and provide Transparency.
Why is ITO used in intelligent windows?
ITO coatings on such surfaces can efficiently control the amount of light and energy transmitted through them, aiding in energy conservation within rural and urban buildings by allowing visible light in while blocking UV and IR radiation.
Indium Tin Oxide, ITO
Used in Various Industries
Biomedical
Energy
Aerospace
Automotive
Healthcare
Electronics
