[15a-A305-1~13] 13.3 Insulator technology

△ [15a-A305-7] Investigation on band alignment modulation by interface dipole layer formation at perovskite oxide interface

〇Atsushi Tamura¹, Koji Kita¹ (1.The Univ. of Tokyo)

Keywords:dipole, insulator, perovskite

The dipole effect due to the insertion of the charge layer at the perovskite oxide interface is experimentally shown from the change of the Schottky barrier. In this experiment, LaAlO₃ was inserted as a charge layer at the interface between the conductive oxide SrRuO₃ and the insulating oxide SrTiO₃. A shift to the higher energy side of 0.38 eV was observed by XPS cut-off energy measurement. This can be explained if a negative charge of 10¹⁴ /cm² is present in the LAO layer at a distance of ~ 1 nm from the SRO surface, and it is possible to control the band alignment of stacked structure.