β-Ga2O3 combines a bandgap of 4.6–4.9 eV with a critical breakdown field of ~8 MV/cm and a Baliga’s figure of merit approximately 3,444× silicon. Uniquely, it supports melt-based bulk crystal growth methods such as edge-defined film-fed growth and Czochralski, enabling large-area, low-cost substrates unavailable in competing ultra-wide bandgap materials including SiC, GaN, AlN, and diamond.

The core technical challenge across the dataset is the inability to achieve effective p-type doping in Ga2O3. Unlike SiC or GaN, where p-type junction termination extensions can be formed by ion implantation, Ga2O3 forces all edge termination strategies onto dielectric field plates, heterojunction p-type oxide interlayers, trench structures, or novel surface passivation — defining four distinct innovation clusters.