Science Advances

Supplementary Materials

This PDF file includes:

  • Fig. S1. Basic characterization of PdCoO2 thin films grown on β-Ga2O3 (−201).
  • Fig. S2. Relationship between work function and lattice constant for typical metal electrodes with a (pseudo-)hexagonal lattice constant close to the representative hexagonal wide-gap semiconductors.
  • Fig. S3. Temperature dependence of the Schottky barrier height and the ideality factor.
  • Fig. S4. Determination of the work function for PdCoO2 using the ultraviolet photoelectron spectroscopy.
  • Fig. S5. Stability of PdCoO2 thin films in a harsh environment.
  • Table S1. Summary of the metal/β-Ga2O3 junctions reported in literature.
  • Table S2. Summary of the partially oxidized metal/β-Ga2O3 junctions reported in literature.

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