κ/β-Ga₂O₃ Type-II Phase Heterojunction.

ABSTRACT: Ultrawide-bandgap gallium oxide (Ga₂O₃) holds immense potential for crucial applications such as solar-blind photonics and high-power electronics. Although several Ga₂O₃ polymorphs, i.e., α, β, γ, δ, ε, and κ phases, have been identified, the band alignments between these phases have been largely overlooked due to epitaxy challenges and inadvertent neglect. Despite having similar stoichiometry, heterojunctions involving different phases may exhibit band offsets. Here, β-Ga₂O₃/κ-Ga₂O₃-stacked "phase heterojunction" is demonstrated experimentally. This phase heterojunction has a sharp and well-defined interface, and subsequent measurements reveal an unbeknown type-II band alignment with significant valenc

SUBMITTER: Lu Y 

PROVIDER: S-EPMC11854863 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature