Introduction to Niobium Oxide
Niobium pentoxide (Nb₂O₅) is a fully oxidised niobium oxide available in monoclinic, orthorhombic, and amorphous forms, depending on processing conditions. It is a wide-bandgap insulating material with an optical bandgap of approximately 3.4–4.0 eV, high refractive index, strong chemical resistance, and good thermal stability. These properties make Nb₂O₅ valuable for optical and electronic thin films. RF or reactive DC magnetron sputtering enables precise control of film stoichiometry, thickness, density, and microstructure across large substrates. Sputtered Nb₂O₅ films are used in anti-reflective and high-reflectivity optical coatings, electrochromic smart windows, high-k dielectric layers, capacitors, and photocatalytic or photovoltaic devices.
Types & Grades of Niobium Oxide
Niobium 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 Catalogue Disc (IN-Nb-01) | 99.9% (3N) | 1 in diameter x 0.125 in thick; stocked size for lab-scale RF sputtering and process development |
| Standard Catalogue Disc (IN-Nb-02) | 99.9% (3N) | 2in diameter x 0.25in thick; common size for small pilot-line deposition systems |
| High-Purity Grade | 99.99% – 99.999% (4N – 5N) | Reduced metallic and oxide impurities for optical coatings and electrochromic films sensitive to trace contamination |
| Large-Format / Custom Target | 99.9% – 99.99% | Rectangular and oversized round targets machined to specification for production coaters and roll-to-roll lines |
| Bonded Assembly | 99.9% – 99.99% | Nb2O5 target bonded to a copper or aluminium backing plate for improved thermal management under sustained RF power |
Applications of Niobium Oxide
Sputtered films of Niobium 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 |
|---|
| Optics and Photonics | Anti-reflective and high-reflectivity coatings | High-index Nb2O5 layers alternate with low-index oxides to control interference and transmission |
| Smart Glass / Architectural Glazing | Electrochromic device stacks | Nb2O5 serves as an ion-storage or active electrochromic layer that modulates optical transmittance. |
| Semiconductor and Microelectronics | High-k capacitor dielectrics | Elevated dielectric constant supports charge storage in thin-film capacitors and memory structures. |
| Solar and Photovoltaics | Anti-reflective and passivation coatings on solar cells | Reduces surface reflectance and improves light coupling into the absorber layer |
| Sensors | Gas and humidity sensing films | Surface redox chemistry of Nb2O5 provides sensitivity to changes in ambient gas composition. |
| Photocatalysis and Energy Storage | Niobium-doped titania and Nb2O5-based electrode films | Wide bandgap and stable redox chemistry support photocatalytic activity and Li-ion intercalation electrodes |
Take the Next Step
Infinita Materials fabricates Niobium 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.
