Strontium Stannate as an Ultra-Wide Bandgap Semiconductor

ORAL

Abstract

The development of superior ultra-wide bandgap (UWBG) semiconductors is crucial for next-generation high-power devices. This talk establishes SrSnO3 (SSO) as an outstanding UWBG semiconductor. We show SSO thin-film growth with controlled doping and present detailed transport measurements supplemented by first-principles calculations of e-ph interactions and charge transport. We discuss details of the MBE growth, strain relaxation and electronic transport properties as a function of temperature, chemical doping and strain. Our results shed light on the transport behavior and mobility-limiting mechanisms in SSO, and demonstrate that Nd-doped SSO films achieve the best of both worlds – carrier densities as high as 2 × 1020 cm-3 together with a high room temperature mobility of ~70 cm2V-1s-1. These figures of merit place perovskite oxides, for the first time, on par with well-established UWBG semiconductors.

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Presenters

  • Tristan Truttmann

    • Department of Chemical Engineering and Materials Science, University of Minnesota
    • University of Minnesota

Authors

  • Tristan Truttmann

    • Department of Chemical Engineering and Materials Science, University of Minnesota
    • University of Minnesota

  • Jin-Jian Zhou

    • Department of Applied Physics and Materials Science, California Institute of Technology

  • I-Te Lu

    • Caltech
    • Department of Applied Physics and Materials Science, California Institute of Technology

  • Anil Kumar Rajapitamahuni

    • Department of Chemical Engineering and Materials Science, University of Minnesota

  • Fengdeng Liu

    • Department of Chemical Engineering and Materials Science, University of Minnesota

  • Richard James

    • Department of Aerospace Engineering and Mechanics, University of Minnesota

  • Marco Bernardi

    • Caltech
    • California Institute of Technology
    • Department of Applied Physics and Materials Science, California Institute of Technology
    • Applied Physics & Materials Science, Caltech

  • Bharat Jalan

    • University of Minnesota
    • Department of Chemical Engineering and Materials Science, University of Minnesota
    • Department of Electrical and Computer Engineering, University of Minnesota