Charge Transfer and Built-in Electric Fields Between the Crystalline Oxide SrNb<sub>x</sub>Ti<sub>1-x</sub>O<sub>3-δ</sub> and Silicon

ORAL

Abstract

Heterojunctions between semiconductors and oxides are fundamental to field-effect devices that have revolutionized information technology. However, their principal functionality remains as capacitors within the metal-insulator-semiconductor (MIS) paradigm. Here we report charge transfer and the formation of built-in electric fields across heterojunctions between single-crystalline SrNbxTi1-xO3-δ and Si(001). A non-monotonic anomaly in the sheet resistance is observed, accompanied by a crossover in sign of the Hall resistance which indicates the formation of a hole gas in the Si and the presence of strong built-in fields. Hard X-ray photoelectron spectroscopy measurements reveal pronounced asymmetric features in both the SrNbxTi1-xO3-δ and Si core-level spectra that we show arise from built-in fields. Analysis of these unprecedented asymmetries enables band-bending to be spatially mapped across the heterojunction. Control of charge transfer and built-in fields opens a pathway to realize hybrid pn-junctions, isotype junctions etc., that elevate the functionality of semiconductor-oxide heterojunctions beyond the MIS paradigm.

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Presenters

  • Zheng Hui Lim

    • Department of Physics, University of Texas at Arlington
    • Department of Physics, University of Texas-Arlington

Authors

  • Zheng Hui Lim

    • Department of Physics, University of Texas at Arlington
    • Department of Physics, University of Texas-Arlington

  • Nicholas F Quackenbush

    • Materials Measurement Science Division, Material Measurement Laboratory, National Institute of Standards and Technology
    • Materials Measurement Science Division, National Institute of Standards
    • Materials Measurement Science Division, National Institute of Standards and Technology

  • Aubrey Penn

    • Department of Materials Science & Engineering, North Carolina State University

  • Matthew Chrysler

    • Department of Physics, University of Texas at Arlington
    • Department of Physics, University of Texas-Arlington

  • mark bowden

    • Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory
    • Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory
    • Pacific Northwest Natl Lab

  • Zihua Zhu

    • Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory
    • Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory

  • James Ablett

    • Synchrotron SOLEIL

  • Tien-Lin Lee

    • Diamond Light Source
    • Diamond Light Source, UK

  • James LeBeau

    • Department of Materials Science & Engineering, North Carolina State University

  • Joseph Woicik

    • Materials Measurement Science Division, National Institute of Standards
    • Materials Measurement Science Division, National Institute of Standards and Technology
    • Ceramics Division, National Institute of Standards and Technology

  • Peter Sushko

    • Physical Sciences Division, Pacific Northwest National Laboratory
    • Pacific Northwest Natl Lab

  • Scott Chambers

    • Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory
    • Physical Sciences Division, Pacific Northwest National Laboratory
    • Pacific Northwest Natl Lab

  • Joseph Ngai

    • Department of Physics, University of Texas at Arlington
    • Department of Physics, University of Texas-Arlington