Determination of the electrostatic potential distribution in Pt/Fe:SrTiO3/Nb:SrTiO3 thin-film structures by electron holography

作者：Marchewka Astrid; Cooper David; Lenser Christian; Menzel Stephan^*; Du Hongchu; Dittmann Regina; Dunin Borkowski Rafal E; Waser Rainer

来源：Scientific Reports, 2014, 4(1): 6975.

DOI：10.1038/srep06975

We determined the electrostatic potential distribution in pristine Pt/Fe:SrTiO3/Nb:SrTiO3 structures by electron holography experiments, revealing the existence of a depletion layer extending into the Nb-doped bottom electrode. Simulations of potential profiles in metal-insulator-metal structures were conducted assuming different types and distributions of dopants. It is found that the presence of acceptor-type dopant concentrations at the Fe:SrTiO3/Nb:SrTiO3 interface with a donor-doped insulating layer provides a good match to the measured profile. Such acceptor-type interface concentrations may be associated with Sr vacancies on the Nb:SrTiO3 side of the bottom interface.

• 出版日期2014-11-10
• 单位中国地震局