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Title: First-principles study of band gap engineering via oxygen vacancy doping in perovskite ABB'O₃ solid solutions

Abstract

Oxygen vacancies in perovskite oxide solid solutions are fundamentally interesting and technologically important. However, experimental characterization of the vacancy locations and their impact on electronic structure is challenging. We have carried out first-principles calculations on two Zr-modified solid solutions, Pb(Zn1/3Nb2/3)O₃ and Pb(Mg1/3Nb2/3)O₃, in which vacancies are present. We find that the vacancies are more likely to reside between low-valent cation-cation pairs than high-valent cation-cation pairs. Based on the analysis of our results, we formulate guidelines that can be used to predict the location of oxygen vacancies in perovskite solid solutions. Our results show that vacancies can have a significant impact on both the conduction and valence band energies, in some cases lowering the band gap by ≈0.5 eV. The effects of vacancies on the electronic band structure can be understood within the framework of crystal field theory.

Authors:
; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1098415
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Volume: 84 Journal Issue: 24; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Qi, Tingting, Curnan, Matthew T., Kim, Seungchul, Bennett, Joseph W., Grinberg, Ilya, and Rappe, Andrew M. First-principles study of band gap engineering via oxygen vacancy doping in perovskite ABB'O₃ solid solutions. United States: N. p., 2011. Web. doi:10.1103/PhysRevB.84.245206.
Qi, Tingting, Curnan, Matthew T., Kim, Seungchul, Bennett, Joseph W., Grinberg, Ilya, & Rappe, Andrew M. First-principles study of band gap engineering via oxygen vacancy doping in perovskite ABB'O₃ solid solutions. United States. https://doi.org/10.1103/PhysRevB.84.245206
Qi, Tingting, Curnan, Matthew T., Kim, Seungchul, Bennett, Joseph W., Grinberg, Ilya, and Rappe, Andrew M. Thu . "First-principles study of band gap engineering via oxygen vacancy doping in perovskite ABB'O₃ solid solutions". United States. https://doi.org/10.1103/PhysRevB.84.245206.
@article{osti_1098415,
title = {First-principles study of band gap engineering via oxygen vacancy doping in perovskite ABB'O₃ solid solutions},
author = {Qi, Tingting and Curnan, Matthew T. and Kim, Seungchul and Bennett, Joseph W. and Grinberg, Ilya and Rappe, Andrew M.},
abstractNote = {Oxygen vacancies in perovskite oxide solid solutions are fundamentally interesting and technologically important. However, experimental characterization of the vacancy locations and their impact on electronic structure is challenging. We have carried out first-principles calculations on two Zr-modified solid solutions, Pb(Zn1/3Nb2/3)O₃ and Pb(Mg1/3Nb2/3)O₃, in which vacancies are present. We find that the vacancies are more likely to reside between low-valent cation-cation pairs than high-valent cation-cation pairs. Based on the analysis of our results, we formulate guidelines that can be used to predict the location of oxygen vacancies in perovskite solid solutions. Our results show that vacancies can have a significant impact on both the conduction and valence band energies, in some cases lowering the band gap by ≈0.5 eV. The effects of vacancies on the electronic band structure can be understood within the framework of crystal field theory.},
doi = {10.1103/PhysRevB.84.245206},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 24,
volume = 84,
place = {United States},
year = {Thu Dec 15 00:00:00 EST 2011},
month = {Thu Dec 15 00:00:00 EST 2011}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.1103/PhysRevB.84.245206

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Cited by: 24 works
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