Improved electrical mobility in highly epitaxial La: BaSnO3 films on SmScO3(110) substrates

P. V. Wadekar, J. Alaria, M. O'Sullivan, N. L O Flack, T. D. Manning, L. J. Phillips, K. Durose, Omar Lozano Garcia, S. Lucas, J. B. Claridge, M. J. Rosseinsky

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Heteroepitaxial growth of BaSnO3 and Ba1-xLa xSnO3 (x = 7%) lanthanum doped barium stannate thin films on different perovskite single crystal (SrTiO3 (001) and SmScO 3 (110)) substrates has been achieved by pulsed laser deposition under optimized deposition conditions. X-ray diffraction measurements indicate that the films on either of these substrates are relaxed due to the large mismatch and present a high degree of crystallinity with narrow rocking curves and smooth surface morphology while analytical quantification by proton induced X-ray emission confirms the stoichiometric La transfer from a polyphasic target, producing films with measured La contents above the bulk solubility limit. The films show degenerate semiconducting behavior on both substrates, with the observed room temperature resistivities, Hall mobilities, and carrier concentrations of 4.4 mΩ cm, 10.11 cm2 V-1 s -1, and 1.38 × 1020 cm-3 on SmScO 3 and 7.8 mΩ cm, 5.8 cm2 V-1 s -1, and 1.36 × 1020 cm-3 on SrTiO 3 ruling out any extrinsic contribution from the substrate. The superior electrical properties observed on the SmScO3 substrate are attributed to reduction in dislocation density from the lower lattice mismatch.

    Original languageEnglish
    Article number052104
    JournalApplied Physics Letters
    Volume105
    Issue number5
    DOIs
    Publication statusPublished - 4 Aug 2014

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