High Mobility Two-Dimensional Electron Gas at the BaSnO₃/SrNbO₃ Interface

Sharad Mahatara; Suresh Thapa; Hanjong Paik; Ryan Comes; Boris Kiefer

doi:10.1021/acsami.2c12195

journal article·2022-10-05

High Mobility Two-Dimensional Electron Gas at the BaSnO₃/SrNbO₃ Interface

Sharad Mahatara, Suresh Thapa, Hanjong Paik, Ryan Comes, Boris Kiefer

ACS Applied Materials & Interfaces· Volume 14· Issue 39

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Abstract

Oxide two-dimensional electron gases (2DEGs) promise high charge carrier concentrations and low-loss electronic transport in semiconductors such as BaSnO3 (BSO). ACBN0 computations for BSO/SrNbO3 (SNO) interfaces show Nb-4d electron injection into extended Sn-5s electronic states. The conduction band minimum consists of Sn-5s states ∼1.2 eV below the Fermi level for intermediate thickness 6-unit cell BSO/6-unit cell SNO superlattices, corresponding to an electron density in BSO of ∼1021 cm–3. Experimental studies of analogous BSO/SNO interfaces grown by molecular beam epitaxy confirm significant charge transfer from SNO to BSO. In situ angle-resolved X-ray photoelectron spectroscopy studies show an electron density of ∼4 × 1021 cm–3. The consistency of theory and experiments show that BSO/SNO interfaces provide a novel materials platform for low loss electron transport in 2DEGs.

Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materials

OpenAlex topics: Electronic and Structural Properties of Oxides · Magnetic and transport properties of perovskites and related materials · Advanced X-ray and CT Imaging

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, New Mexico State University, 1255 N Horseshoe, Las Cruces, New Mexico 88003-8001, United States

Department of Physics, Auburn University, 380 Duncan Drive, Auburn, Alabama 36849, United States

Platform for the Accelerated Realization, Analysis, and Discovery of Interface Materials (PARADIM), Cornell University, 210 Bard Hall, Ithaca, New York 14853, United States

School of Electrical & Computer Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States

Funding

Alabama EPSCoR · Air Force Office of Scientific Research · National Science Foundation · Extreme Science and Engineering Discovery Environment

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