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I-V curve at Pt/SrTiO3:Nb junction with different Nb concentrations.
XPE spectra in valence band and Ti 2p3/2 range of naked SrTiO3:Nb surface and Pt/SrTiO3:Nb structures. SXPE and HXPE denote XPE excited by soft x-ray (AlKα) and hard x-ray (6 keV), respectively. Numbers in wt. % show Nb-doping concentrations in SrTiO3:Nb crystal.
Illustration of XPE profile simulation.
Observed and simulated HXPE profiles. Solid lines and dots show simulated and observed XPE values, respectively. Inset shows potential profile in SrTiO3:Nb determined by entering φB and N D values shown here into Eq. (5) .
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