Systematic Band Gap Tuning of BaSnO3 via Chemical Substitutions: The Role of Clustering in Mixed-Valence Perovskites

Published

Journal Article

© 2017 American Chemical Society. By combining high-throughput experiments and first-principles calculations based on the DFT-ACBN0 approach, we have investigated the energy band gap of Sr-, Pb-, and Bi-substituted BaSnO3 over wide concentration ranges. We show that the band gap energy can be tuned from 3 to 4 eV by chemical substitution. Our work indicates the importance of considering the mixed-valence nature and clustering effects upon substitution of BaSnO3 with Pb and Bi. Starting from the band gap of ?3.4 eV for pure BaSnO3, we find that Pb substitution changes the gap in a nonmonotonic fashion, reducing it by as much as 0.3 eV. Bi substitution provides a monotonic reduction but introduces electronic states into the energy gap due to Bi clustering. Our findings provide new insight into the ubiquitous phenomena of chemical substitutions in perovskite semiconductors with mixed-valence cations that underpin their physical properties.

Full Text

Duke Authors

Cited Authors

  • Lee, S; Wang, H; Gopal, P; Shin, J; Jaim, HMI; Zhang, X; Jeong, SY; Usanmaz, D; Curtarolo, S; Fornari, M; Buongiorno Nardelli, M; Takeuchi, I

Published Date

  • November 14, 2017

Published In

Volume / Issue

  • 29 / 21

Start / End Page

  • 9378 - 9385

Electronic International Standard Serial Number (EISSN)

  • 1520-5002

International Standard Serial Number (ISSN)

  • 0897-4756

Digital Object Identifier (DOI)

  • 10.1021/acs.chemmater.7b03381

Citation Source

  • Scopus