We have investigated the interaction of Pt with single-crystal SrTiO3(
001) and polycrystalline Ba0.7Sr0.3TiO3 thin films using photoemission
spectroscopies. Significant band bending is caused by interface forma
tion,determining the Schottky barrier height. We have depth profiled t
he band bending for Ba0.7Sr0.3TiO3 thin films, giving a direct measure
ment of the depletion depth and built-in potential. (C) 1997 American
Institute of Physics.