New gallium oxide chips promise faster, more efficient power electronics
Researchers have engineered gallium oxide transistors that deliver higher performance using simpler manufacturing and better gate materials. The advance could accelerate adoption of gallium oxide for electric vehicles, data centers, and renewable energy systems—markets currently dominated by silicon and competing semiconductor materials.
Originaltitel: Enabled enhancement mode ß-Ga2O3 MOSFETs with high-? HfO2 gate dielectric and non-recess structure
<p>In this work, we present the design and fabrication of high-performance beta-Ga2O3 metal-oxide-semiconductor field-effect transistors with enhancement mode featuring a non-recessed gate architecture and high-kappa dielectric integration. The device structure, grown on c-plane sapphire substrates by metalorganic chemical vapor deposition, consists of a heavily doped beta-Ga2O3 contact layer, a lightly doped beta-Ga2O3 buffer, an (Al0.21Ga0.79)2O3 barrier, and an unintentionally doped (UID) channel from the surface toward the substrate. The junction of (Al0.21Ga0.79)2O3 and UID channel layer induces a potential well, while the non-recess process avoids plasma-induced surface damage and streamlines fabrication. To enhance electrostatic control, conventional Al2O3 gate dielectrics are replaced with hafnium dioxide (HfO2), whose high permittivity strengthens gate-channel capacitive coupling without increasing physical thickness. This modification enhances the effective oxide capacitance, and thus improves the on current increases and on/off current ratio. Electrical characterization and theoretical analysis confirm that the combined non-recessed design and high-kappa gate dielectric yield substantial performance gains, providing a viable pathway toward next-generation beta-Ga2O3 power and high-frequency electronic devices.</p>