La-doped BaSnO3—Degenerate perovskite transparent conducting oxide: Evidence from synchrotron x-ray spectroscopy

We report direct evidence of conduction band filling in 3% La-doped BaSnO3 using hard x-ray photoelectron spectroscopy. Direct comparisons with hybrid density functional theory calculations support a 3.2 eV indirect band gap. The use of hybrid DFT is verified by excellent agreement between our photo...

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Bibliographic Details
Published in:Applied physics letters 2013-07, Vol.103 (4)
Main Authors: Sallis, S., Scanlon, D. O., Chae, S. C., Quackenbush, N. F., Fischer, D. A., Woicik, J. C., Guo, J.-H., Cheong, S. W., Piper, L. F. J.
Format: Article
Language:English
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Summary:We report direct evidence of conduction band filling in 3% La-doped BaSnO3 using hard x-ray photoelectron spectroscopy. Direct comparisons with hybrid density functional theory calculations support a 3.2 eV indirect band gap. The use of hybrid DFT is verified by excellent agreement between our photoelectron spectra and O K-edge x-ray emission and absorption spectra. Our experimental and computational results demonstrate that the conduction band is primarily of Sn 5s orbital character with little O 2p contribution, which is a prerequisite for designing a perovskite-based transparent conducting oxide.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4816511