κ/β‐Ga 2 O 3 Type‐II Phase Heterojunction

Abstract Ultrawide‐bandgap gallium oxide (Ga 2 O 3 ) holds immense potential for crucial applications such as solar‐blind photonics and high‐power electronics. Although several Ga 2 O 3 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‐Ga 2 O 3 /κ‐Ga 2 O 3 ‐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…

• KA
  King Abdullah University of Science and Technology

  Awards: REI/1/5124-01-01, REI/1/4999-01-01, BAS/1/1664-01-01