Band alignment at epitaxial BaSnO3/SrTiO3(001) and BaSnO3/LaAlO3(001) heterojunctions

Abstract

We have spectroscopically determined the band offsets at epitaxial interfaces of BaSnO3 with SrTiO3(001) and LaAlO3(001). The conduction band minimum is lower in electron energy in the BaSnO3 than in the SrTiO3 and LaAlO3 by 0.6 +/- 0.1 eV and 3.7 +/- 0.1 eV, respectively. Thus, electrons generated in the SrTiO3 and LaAlO3 and transferred to the BaSnO3 by modulation and polarization doping, respectively, are expected to drift under the influence of an electric field without undergoing impurity scattering and the associated loss of mobility. This result bodes well for the realization of oxide-based, high-mobility, two-dimensional electron systems that can operate at ambient temperature.

References in corpus (5)

• High Mobility in a Stable Transparent Perovskite Oxide
• Physical properties of transparent perovskite oxides (Ba,La)SnO3 with high electrical mobility at room temperature
• High carrier mobility in transparent Ba1-xLaxSnO3 crystals with a wide band gap
• Band alignment at epitaxial BaSnO3/SrTiO3(001) and BaSnO3/LaAlO3(001) heterojunctions
• Tuning Optical Properties of Transparent Conducting Barium Stannate by Dimensional Reduction

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• Probing Emergent Surface and Interfacial Properties in Complex Oxides via in situ X-ray Photoelectron Spectroscopy
• Phonon-assisted optical absorption in BaSnO${}_3$ from first principles
• A consistent picture of excitations in cubic BaSnO${}_3$ revealed by combining theory and experiment
• Separating Electrons and Donors in BaSnO3 via Band Engineering
• Sn(II)-containing phosphates as optoelectronic materials
• A two-dimensional electron gas based on a 5s oxide with high room-temperature mobility and strain sensitivity
• Tuning two-dimensional electron (hole) gases at LaInO${}_3$/BaSnO${}_3$ interfaces: Impact of polar distortions, termination, and thickness
• Electronic structure of BaSnO3 investigated by high-energy-resolution electron energy-loss spectroscopy and ab initio calculations
• Epitaxial Films and Devices of Transparent Conducting Oxides: La:BaSnO${}_3$
• Fingerprints of optical absorption in the perovskite LaInO${}_3$: Insight from many-body theory and experiment