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Table 1 XPS core level fitting results and VBM positions

From: Valence band offset of wurtzite InN/SrTiO3 heterojunction measured by x-ray photoelectron spectroscopy

Sample State Binding energy(eV)
InN In 3d 5/2 443.50 ± 0.03
   444.52 ± 0.03
  VBM 0.45 ± 0.1
SrTiO3 Ti 2p 458.19 ± 0.03
  VBM 1.91 ± 0.03
InN/SrTiO3 In 3d 5/2 443.68 ± 0.03
   444.87 ± 0.03
  Ti 2p 458.17 ± 0.03
  1. VBMs are obtained by linear extrapolation of the leading edge to the extended base line of the VB spectra.