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Interface electronic structure in a metal/ferroelectric heterostructure under applied bias

机译:施加偏压下金属/铁电异质结构中的界面电子结构

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摘要

The effective barrier height between an electrode and a ferroelectric (FE) depends on both macroscopic electrical properties and microscopic chemical and electronic structure. The behavior of a prototypical electrode/FE/electrode structure, Pt/BaTiO_3/Nb-doped SrTiO_3, under in-situ bias voltage is investigated using x-ray photoelectron spectroscopy. The full band alignment is measured and is supported by transport measurements. Barrier heights depend on interface chemistry and on the FE polarization. A differential response of the core levels to applied bias as a function of the polarization state is observed, consistent with Callen charge variations near the interface.
机译:电极和铁电体(FE)之间的有效势垒高度取决于宏观电性能以及微观化学和电子结构。利用X射线光电子能谱研究了原型电极/ FE /电极结构Pt / BaTiO_3 / Nb掺杂的SrTiO_3在原位偏置电压下的行为。进行全频带对准,并得到传输测量的支持。势垒高度取决于界面化学性质和FE极化。观察到了核心能级对施加偏压的不同响应,该响应是极化状态的函数,与界面附近的卡伦电荷变化一致。

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  • 来源
    《Physical review》 |2013年第15期|155146.1-155146.8|共8页
  • 作者单位

    CEA, DSM/IRAMIS/SPCSI, F-91191 Gif-sur-Yvette Cedex, France;

    Institut d' Electronique Fondamentale, Universite Paris-Sud, Batiment 220, 91405 Orsay, France;

    Institut d' Electronique Fondamentale, Universite Paris-Sud, Batiment 220, 91405 Orsay, France;

    Institut d' Electronique Fondamentale, Universite Paris-Sud, Batiment 220, 91405 Orsay, France;

    Institut d' Electronique Fondamentale, Universite Paris-Sud, Batiment 220, 91405 Orsay, France;

    Universite de Lyon, Ecole Centrale de Lyon, Institut des Nanotechnologies de Lyon, F-69154 Ecully cedex, France,IHP, Im Technologiepark 25, D-15236 Frankfurt (Oder), Germany;

    Universite de Lyon, Ecole Centrale de Lyon, Institut des Nanotechnologies de Lyon, F-69154 Ecully cedex, France;

    Synchrotron-SOLEIL, BP 48, Saint-Aubin, F91192 Gif sur Yvette CEDEX, France;

    Synchrotron-SOLEIL, BP 48, Saint-Aubin, F91192 Gif sur Yvette CEDEX, France;

    Synchrotron-SOLEIL, BP 48, Saint-Aubin, F91192 Gif sur Yvette CEDEX, France;

    CEA, DSM/IRAMIS/SPCSI, F-91191 Gif-sur-Yvette Cedex, France;

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  • 正文语种 eng
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  • 关键词

    ferroelectricity and antiferroelectricity; multilayers; electronic transport in interface structures; dielectric; piezoelectric; ferroelectric; and antiferroelectric;

    机译:铁电和反铁电多层接口结构中的电子传输;电介质压电铁电和反铁电;

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