Charge Transfer and Built-in Electric Fields Between the Crystalline Oxide SrNbxTi1-xO3-δ 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