Zinc Oxide

Inside every substation, a quiet stack of zinc oxide ceramics stands guard: when lightning strikes or a switching fault sends a surge down the line, ZnO varistors flip from insulator to conductor in nanoseconds and swallow the transient whole. The same wurtzite crystal emits ultraviolet light from room-temperature excitons, converts vibrations into electricity as nanowires, and substitutes for ITO as a transparent electrode. Few materials serve so many industries at once.

Eata Energy supplies zinc oxide across that entire range: varistor-grade powders and dopant packages, nano powders, AZO and GZO sputtering targets, hydrothermal single-crystal wafers, nanowire arrays and colloidal quantum dots — every batch certified for purity, particle size and phase.

Sintered ZnO varistor ceramics — the heart of modern surge protection

What Is Zinc Oxide?

Zinc oxide is an n-type semiconductor with the wurtzite crystal structure and a direct band gap of 3.37 eV. Three structural quirks give it an unusual career. First, its excitons bind with 60 meV — nearly triple GaN's — so they survive at room temperature and radiate efficient UV light. Second, the lattice lacks inversion symmetry, making every ZnO crystal a tiny piezoelectric transducer. Third, its grain boundaries can be engineered into back-to-back Schottky barriers, turning a sintered ceramic disc into a self-acting surge valve. Add non-toxicity, earth abundance and low cost, and ZnO becomes one of the most versatile oxides in the catalog.

ZnO Grades We Supply

Purity, dopant content and particle size are lot-certified; custom formulations on request.

Key Properties of Zinc Oxide

• Room-temperature excitons — a 60 meV exciton binding energy (versus roughly 25 meV for GaN) keeps excitonic UV emission and even random lasing alive at 300 K, no cryogenics required.
• Electrical self-switching — doped ZnO ceramics reach nonlinear coefficients α above 50 and breakdown fields of 500–700 V/mm (far higher in research microstructures), insulating at line voltage yet conducting within nanoseconds of a surge.
• Indium-free transparent conduction — AZO and GZO films sputtered from ceramic targets deliver 10⁻⁴–10⁻³ Ω·cm resistivity with over 80% visible transmittance, matching ITO performance from earth-abundant elements.
• Native piezoelectricity — the polar wurtzite lattice converts strain into voltage; ZnO nanowires powered the first piezoelectric nanogenerator in 2006 and founded the field of piezotronics.
• A working surface — adsorbed species modulate ZnO's conductivity (gas sensing), band-edge charges drive redox chemistry (photocatalysis), and UV photons switch it photoconductive (solar-blind detection).
• Practical to the core — non-toxic, biocompatible, inexpensive and able to grow as films or nanostructures on virtually any substrate, including polymers and fibers.

Available Forms

• Powders — standard and nano ZnO at 3N–4N purity, controlled BET and D50
• Varistor formulations — ZnO with Bi₂O₃, Sb₂O₃, Co, Mn and rare-earth dopant packages, ready to press and sinter
• Sputtering targets — AZO (typically 2 wt% Al₂O₃), GZO and undoped ZnO, high density, bonded
• Single-crystal wafers — hydrothermal ZnO, Zn- or O-polar, epi-ready polished
• Nanostructures — nanowire and nanorod powders, plus array growth on customer substrates
• Quantum dots — colloidal ZnO dispersions with size-tuned emission for research

Applications of Zinc Oxide

Surge Protection and Varistors

The metal-oxide varistor is one of the great ceramic inventions: sinter ZnO grains with Bi₂O₃, Sb₂O₃ and a few mol% of Co and Mn oxides, and every grain boundary becomes a back-to-back Schottky barrier. Below threshold the ceramic is an insulator; above it, tunneling collapses the barriers and the disc clamps the surge. Commercial blocks switch with nonlinear coefficients above 50 at 500–700 V/mm, and two-step-sintered laboratory microstructures have demonstrated α approaching 270 at 20 kV/cm. The technology scales from phone chargers to 1000 kV GIS station arresters — and it all begins with powder purity and dopant homogeneity, where a single coarse agglomerate becomes a failure channel.

Metal-oxide surge arresters guarding high-voltage substations

Transparent Conductive Oxide Films

Where indium is costly or scarce, aluminum- and gallium-doped ZnO step in. Sputtered from ceramic targets — most commonly ZnO with 2 wt% Al₂O₃ — AZO films reach 1×10⁻⁴ to 10⁻³ Ω·cm resistivity with transmittance above 80%, figures that have carried them into amorphous-silicon and CIGS solar modules, touch panels, LED electrodes and OLEDs that match ITO-based devices. Magnetron sputtering at moderate temperature makes the process roll-to-roll compatible, and texture-etching adds light trapping for thin-film photovoltaics. The film is only as uniform as the target: our AZO and GZO targets are sintered to high density with dopant distribution verified across the disc.

High-density AZO ceramic targets for transparent electrode deposition

UV Optoelectronics and Photodetectors

ZnO's 60 meV excitons are its claim on optoelectronics: stable at room temperature, they promise UV LEDs and lasers free of the cryogenic or high-temperature tricks other wide-gap materials demand. Hybrid GaN-on-ZnO devices exploit a lattice mismatch of only 1.8% — versus 15% on sapphire — for lower-dislocation epitaxy, and ZnO photoconductors serve as fast, visible-blind UV detectors in flame sensing and environmental monitoring. Progress runs on substrates: hydrothermally grown bulk ZnO wafers, polished epi-ready on the Zn or O face, are the enabling consumable, and one of the products we are proudest to stock.

A wire-bonded UV emitter chip — ZnO's excitons shine without cryogenic help

Piezoelectric Devices and Nanogenerators

Bend a ZnO nanowire and it answers with a voltage. That simple observation became the first piezoelectric nanogenerator in 2006, then an entire discipline — piezotronics and piezo-phototronics — where strain-generated potentials gate sensors, brighten LEDs, boost solar cells and drive photodetectors. ZnO leads because it grows as well-aligned nanowire arrays on almost anything, by low-temperature hydrothermal routes, at a fraction of the cost of III-V alternatives. Thin sputtered ZnO films carry the same piezoelectricity into surface-acoustic-wave devices and MEMS. We supply both the nanowire feedstock and the undoped targets these films are deposited from.

Vertically aligned ZnO nanowire arrays — the engine of piezotronic devices

Single-Crystal Substrates and Advanced Research

Beyond the flagship applications, ZnO keeps research groups busy across chemistry and physics. Hydrothermal bulk crystals provide homoepitaxial substrates and reference standards; nano ZnO drives photocatalytic oxidation for water treatment; surface-engineered particles detect hydrogen, ethanol and NO₂ at ppm levels; colloidal quantum dots explore size-tuned UV emission; and the tire industry still activates rubber vulcanization with ZnO by the ton. Whatever the project, the common requirement is a supplier who certifies what the powder actually is — phase, size, dopants — rather than what the label hopes it is.

Hydrothermal ZnO single crystals — wafers for homoepitaxy and device research

Why Source Zinc Oxide from Eata Energy

ZnO is unforgiving in opposite directions: varistor ceramics fail from a single coarse particle, while epi wafers fail from a single scratch. Eata Energy runs powder, ceramic and crystal lines under one quality system — dopant uniformity checked across every target, D50 and BET certified on every powder lot, and wafer surfaces qualified for epitaxy before they ship. You get one accountable source from the raw oxide to the finished target or wafer.

• 3N–4N purity with full trace-element breakdown per certificate
• Dopant homogeneity verified across sputtering targets, not just at the center
• Particle size, BET and phase content reported for every powder batch
• Epi-ready wafer polishing with documented roughness and orientation

Custom Zinc Oxide Services

Tell us the performance target and we will engineer the material to match: varistor formulations tuned to your breakdown field and α, AZO/GZO compositions adjusted for your sputter line, powder D50 and BET set for your paste or press. We also customize nanowire morphology, quantum-dot size, target dimensions and bonding, and wafer orientation, thickness and polish. Send the specification — our reply is a technical proposal with data, not a stock brochure.

For Research or Industrial Raw Materials, Not For Personal Medical Use!