AI Insight
Researchers have successfully grown silicon-doped α-(AlxGa1−x)2O3 thin films with bandgaps exceeding 7.0 eV using suboxide molecular-beam epitaxy, representing an exceptionally wide-bandgap semiconductor material. The team demonstrated the practical viability of this material by fabricating functional electronic devices including a Schottky diode and a field-effect transistor with these colossal-bandgap channels. This achievement pushes the boundaries of semiconductor bandgap engineering beyond conventional wide-bandgap materials like gallium nitride and silicon carbide.
Why it matters
Ultra-wide bandgap semiconductors enable power electronics that can operate at higher voltages, temperatures, and frequencies than current technologies, potentially revolutionizing applications in electric vehicles, grid infrastructure, and aerospace systems. The 7-eV bandgap significantly exceeds existing commercial wide-bandgap semiconductors, opening possibilities for extreme-environment electronics and deep-ultraviolet optoelectronic devices.
Understand the Science
Nature, Published online: 07 October 2026; doi:10.1038/s41586-026-11085-3
Suboxide molecular-beam epitaxy is used to grow silicon-doped α-(AlxGa1−x)2O3 films with bandgaps exceeding 7.0 eV, enabling the fabrication of a Schottky diode and a field-effect transistor with colossal-bandgap channels.