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Hybrid Molecular Beam Epitaxy and Electronic Transport of Alkaline Earth Stannates

ORAL

Abstract

Perovskite oxides have been the subject of intense ongoing study due to the diverse assortment of available properties and phenomena that they and their derivatives exhibit. However, until recently, there has been an unfilled gap for perovskite oxides that exhibit a high carrier mobility at room temperature. This gap was filled with the discovery of BaSnO3 single crystals exhibiting room-temperature electron mobilities as high as 320 cm2V-1s-1. Here we present the growth of epitaxial thin-films of BaSnO3 and its noncubic analogs through the A-site substitution of Ba with smaller Sr and Ca. This includes a systematic doping study of SrSnO3 over a wide range of carrier concentrations with record room-temperature electron mobilities exceeding 70 cm2V-1s-1, and the first ever growth of CaSnO3 by molecular beam epitaxy, whose ultrawide bandgap make it an encouraging ultra-wide bandgap material for applications in high-power devices and novel heterostructure-based transistors combining other functional perovskite oxides.

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Publication: A. Prakash, P. Xu, A. Faghaninia, S. Shukla, J. W. Ager III, C. S. Lo, and B. Jalan, "Wide Bandgap BaSnO3 Films with Room Temperature Conductivity Exceeding 104 Scm-1" Nat. Comm. 8, 15167 (2017)<br><br>T. K. Truttmann, F. Liu, J. G. Barriocanal, R. D. James, and B. Jalan, "Strain Relaxation via Phase Transformation in SrSnO3" ACS Appl. Electron. Mater. 3 1127 (2021)<br><br>T. K. Truttmann, J.-J. Zhou, I-Te Lu, A. K. Rajapitamahuni, F. Liu, T. Mates, M. Bernardi, and B. Jalan, Combined Experimental-Theoretical Study of Electron Mobility-Limiting Mechanisms in SrSnO3, Comm. Phys. (2021) (in press)

Presenters

  • Tristan K Truttmann

    University of Minnesota, Department of Chemical Engineering and Materials Science, University of Minnesota, Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA

Authors

  • Tristan K Truttmann

    University of Minnesota, Department of Chemical Engineering and Materials Science, University of Minnesota, Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA

  • Jin-Jian Zhou

    Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125, USA

  • I-Te Lu

    Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125, USA, Caltech

  • Anil Kumar Rajapitamahuni

    Department of Chemical Engineering and Materials Science, University of Minnesota, Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA

  • Fengdeng Liu

    University of Minnesota, Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA

  • Richard D James

    University of Minnesota, Department of Aerospace Engineering and Mechanics, University of Minnesota, Department of Aerospace Engineering and Mechanics, University of Minnesota, Minneapolis, Minnesota 55455, United States

  • Marco Bernardi

    Department of Applied Physics and Materials Science, California Institute of Technology, Caltech, Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125, USA

  • Bharat Jalan

    University of Minnesota, Department of Chemical Engineering and Materials Science, University of Minnesota, Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA