Modulation doping in SrSnO3/BaSnO3 heterostructures

POSTER

Abstract

Through a combination of MBE growth, hard X-ray photoelectron spectroscopy (HAXPES), magnetoresistance measurements and transport modeling, we report on the realization of two-dimensional electron gas (2DEG) at SrSnO3/BaSnO3 (SSO/BSO) heterointerfaces. The HAXPES revealed the valence band offset between SSO and BSO to be 0.7 eV resulting in a favorable conduction band offset for modulation doping of BSO using SSO as a spacer layer. Two-channel conduction suggested by the non-linear transverse hall resistance as a function of magnetic field revealed the transfer of electrons from La-doped SSO to BSO. The sheet carrier density on the BSO side was measured to be 5×1012 cm-2 consistent with the value obtained using a self-consistent solution to one-dimensional Poisson and Schrödinger equations. The role of band offset, interface roughness and threading dislocations in BSO will be discussed with the goal to obtain high mobility oxide heterostructures.

Presenters

  • Abhinav Prakash

    Chemical Engineering and Materials Science, University of Minnesota - Twin Cities, University of Minnesota

Authors

  • Abhinav Prakash

    Chemical Engineering and Materials Science, University of Minnesota - Twin Cities, University of Minnesota

  • 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

  • Hwanhui Yun

    Chemical Engineering and Materials Science, University of Minnesota - Twin Cities

  • Jacob T Held

    Chemical Engineering and Materials Science, University of Minnesota - Twin Cities, Chemical Engineering and Materials Science, University of Minnesota

  • Tianqi Wang

    Chemical Engineering and Materials Science, University of Minnesota - Twin Cities, University of Minnesota

  • K. Andre Mkhoyan

    Chemical Engineering and Materials Science, University of Minnesota - Twin Cities, University of Minnesota, Chemical Engineering and Materials Science, University of Minnesota

  • Bharat Jalan

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