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HL: Fachverband Halbleiterphysik

HL 26: Interfaces and Surfaces

HL 26.6: Talk

Monday, March 14, 2011, 17:15–17:30, POT 06

Photoemission spectroscopy studies of SrTiO₃ and its interface to gold — Susi Wintz¹, Mandy Grobosch¹, •Martin Knupfer¹, Juliane Seibt², Florian Hanzig², Hartmut Stöcker², and Dirk C. Meyer² — ¹IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany — ²Institut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Str. 23, 09596 Freiberg, Germany

Motivated by applications of strontium titanate (SrTiO₃, STO) in non-volatile memory devices we studied the surface of STO by means of x-ray and ultra violet photoemission spectroscopy. The focus of the analysis was purity, doping and the annealing time. It could be demonstrated that a surface contamination layer consisting of carbonates and hydroxides exists on surfaces prepared under ambient conditions. In addition, the interface between STO and gold was investigated. We show that there is a weak interaction of these materials, however a Schottky-type Au/SrTiO₃ junction is formed. Finally the work function of all STO samples was determined. The work function depends on the modification of the STO surface. This fact should considered for the formation of such a Schottky-type junction.