New Semiconductor Tops Record Bandgap at 7 eV
The Cornell-developed material is at the research stage, with room-temperature conductivity reported more than 100 million times higher than prior work.
Updated on Nov. 3, 2026 in Materials Science
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Cornell engineers have developed a semiconductor material with a bandgap exceeding 7 electron volts, above the previous record of about 6 electron volts. The study was published in Nature on October 7. The material is at the research stage, not a shipping product.
Why it matters
Wider bandgap semiconductors can withstand stronger electric fields before breaking down, which is why the field keeps pushing toward higher bandgaps. The result extends that trajectory into a range where few materials have been demonstrated to conduct well at room temperature.
The measurements come from thin films grown on sapphire and reported in Nature. The preliminary AlphaFET transistors show more than four orders of magnitude change in current, but the defect density seen under electron microscopy remains a open constraint on performance.
The players
Cornell University
Ithaca-based research university whose engineers developed the silicon-doped aluminum gallium oxide semiconductor and the AlphaFET device.
Jacob Steele
Cornell researcher who grew the thin films of the material using suboxide molecular-beam epitaxy.
The details
The team built the films one atomic layer at a time using suboxide molecular-beam epitaxy, a controlled growth method in which metal-oxide vapors are deposited onto a substrate. Jacob Steele grew the thin films, and silicon atoms were incorporated at a temperature low enough to introduce mobile electrons into the aluminum gallium oxide. The bandgap is the energy a material needs before it can conduct electricity, so a wider gap means the material resists breakdown under stronger electric fields. The researchers then fabricated a working diode and a field-effect transistor, which they named the AlphaFET.
Timeline
October 7: Study detailing the record-setting material published in Nature.
November 3, 2026: Cornell Chronicle article published on the record-setting semiconductor.
The Tech Race
The new material pushes the bandgap past the roughly 6 electron volt level that earlier colossal bandgap materials reached. Researchers expect such semiconductors to eventually enable efficient electrical propulsion and telecom-relevant quantum cascade lasers, though neither application is demonstrated here.
The material is at the research stage, and the team says further work is needed before the devices are practical, so no product timeline has been announced. Nothing in the study changes what consumers or industry can use today.
The takeaway
Wide-bandgap materials are moving toward the high-voltage and high-power applications that depend on them. Watch for follow-up work that reduces the defect density the microscopy identified, since that is the next measurable hurdle.
Further reading
Explore more on Materials Science to see how new semiconductor compounds are being engineered.
Source note: This article includes information reported by Cornell University News Service.
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