title: Direct Observation of Electrostatically Driven Band Gap Renormalization in a Degenerate Perovskite Transparent Conducting Oxide.
abstract: We have directly measured the band gap renormalization associated with the Moss-Burstein shift in the perovskite transparent conducting oxide (TCO), La-doped BaSnO_{3}, using hard x-ray photoelectron spectroscopy. We determine that the band gap renormalization is almost entirely associated with the evolution of the conduction band. Our experimental results are supported by hybrid density functional theory supercell calculations. We determine that unlike conventional TCOs where interactions with the dopant orbitals are important, the band gap renormalization in La-BaSnO_{3} is driven purely by electrostatic interactions.
authors.affiliation: Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, 10 New York 13902, USA.
authors.forename: Z
authors.initials: Z
authors.lastname: Lebens-Higgins
authors.affiliation: Kathleen Lonsdale Materials Chemistry, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom.
authors.forename: D O
authors.initials: DO
authors.lastname: Scanlon
authors.affiliation: Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA.
authors.forename: H
authors.initials: H
authors.lastname: Paik
authors.affiliation: Materials science and Engineering, Applied Physics and Astronomy, Binghamton University, Binghamton, 10 New York 13902, USA.
authors.forename: S
authors.initials: S
authors.lastname: Sallis
authors.affiliation: Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA.|Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, New York 14853, USA‡
authors.forename: Y
authors.initials: Y
authors.lastname: Nie
authors.affiliation: Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, New York 14853, USA‡|Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Uchida
authors.affiliation: Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, 10 New York 13902, USA.
authors.forename: N F
authors.initials: NF
authors.lastname: Quackenbush
authors.affiliation: Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, 10 New York 13902, USA.
authors.forename: M J
authors.initials: MJ
authors.lastname: Wahila
authors.affiliation: National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973, USA§
authors.forename: G E
authors.initials: GE
authors.lastname: Sterbinsky
authors.affiliation: National Synchrotron Light Source-II, Basic Energy Sciences Directorate, Brookhaven National Laboratory, Upton, New York 11973, USA¶
authors.forename: Dario A
authors.initials: DA
authors.lastname: Arena
authors.affiliation: Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
authors.forename: J C
authors.initials: JC
authors.lastname: Woicik
authors.affiliation: Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA.|Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, United States.
authors.forename: D G
authors.initials: DG
authors.lastname: Schlom
authors.affiliation: Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, 10 New York 13902, USA.|Materials science and Engineering, Applied Physics and Astronomy, Binghamton University, Binghamton, 10 New York 13902, USA.
authors.forename: L F J
authors.initials: LF
authors.lastname: Piper