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Temperature-dependent Magnetotransport Study of Si-doped <i>β</i> – Ga<sub>2</sub>O<sub>3</sub> Films

ORAL

Abstract

Monoclinic β – Ga2O3 has generated significant excitement due to the wide bandgap, high electrical breakdown and high electron mobility at room temperature. In this work, we will discuss temperature-dependent magnetotransport study of homoepitaxial Si-doped β – Ga2O3 (010) films grown via metal-organic vapor-phase epitaxy (MOVPE). Temperature dependent Hall measurements were carried out using Van der Pauw configuration. Hall measurement at room temperature yielded a linear slope and a carrier density (n) of ~ 4 x 1017 cm-3. A non-linear Hall resistance was however observed at 10 K < T < 150 K indicating the presence of multiple channel conduction. A transport model using two-channel conduction was used to fit the experimental magnetotransport data resulting in carrier densities, n1, n2 and the corresponding mobilities of µ1, and µ2 respectively. With decreasing temperature, n1 showed a freeze-out behavior with an activation energy of ~ 15 meV, whereas n2 remained nominally unchanged. By combining electrostatic gating using ion-gel as a gate-dielectric, detailed magnetotransport and transport modeling, we will discuss the origin of multiple carriers, defect-mobility relationship, and the relevant scattering mechanisms in MOVPE grown Si-doped β – Ga2O3.

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Presenters

  • Anil Rajapitamahuni

    Department of Chemical Engineering and Materials Science, University of Minnesota-Minneapolis

Authors

  • Anil Rajapitamahuni

    Department of Chemical Engineering and Materials Science, University of Minnesota-Minneapolis

  • Laxman Raju Thoutam

    Department of Chemical Engineering and Materials Science, University of Minnesota-Minneapolis, University of Minnesota

  • Praneeth Ranga

    Department of Electrical and Computers Engineering, The University of Utah

  • Sriram Krishnamoorthy

    Department of Electrical and Computers Engineering, The University of Utah

  • Bharat Jalan

    Chemical Engineering & Materials Science, University of Minnesota, University of Minnesota, Chemical Engineering and Materials Science, University of Minnesotta, Department of Chemical Engineering and Materials Science, University of Minnesota, Chemical Engineering and Materials Science, University of Minnesota, Department of Chemical Engineering and Materials Science, University of Minnesota-Minneapolis, Chemical Engineering and Materials Science, University of Minnesota - Twin Cities