Static and dynamic optical properties of La1-xSrxFeO3-δ: The effects of A-site and oxygen stoichiometry

Sfeir, Matthew Y.; Scafetta, Mark D.; Choquette, Amber K.; Baxter, Jason B.; May, Steven J.

doi:10.1021/acs.chemmater.5b03273

Title: Static and dynamic optical properties of La_1-xSr_xFeO_3-δ: The effects of A-site and oxygen stoichiometry

Journal Article · Wed Dec 09 00:00:00 EST 2015 · Chemistry of Materials

DOI:https://doi.org/10.1021/acs.chemmater.5b03273· OSTI ID:1253279

Sfeir, Matthew Y. ^[1]; Scafetta, Mark D. ^[2]; Choquette, Amber K. ^[2]; Baxter, Jason B. ^[2]; May, Steven J. ^[2]

Brookhaven National Lab. (BNL), Upton, NY (United States)
Drexel Univ., Philadelphia, PA (United States)

Perovskite oxides are a promising material class for photovoltaic and photocatalytic applications due to their visible band gaps, nanosecond recombination lifetimes, and great chemical diversity. However, there is limited understanding of the link between composition and static and dynamic optical properties, despite the critical role these properties play in the design of light-harvesting devices. To clarify these relationships, we systemically studied the optoelectronic properties in La_1-xSr_xFeO_3-δ epitaxial films, uncovering the effects of A-site cation substitution and oxygen stoichiometry. Variable-angle spectroscopic ellipsometry was used to measure static optical properties, revealing a linear increase in absorption coefficient at 1.25 eV and a red-shifting of the optical absorption edge with increasing Sr fraction. The absorption spectra can be similarly tuned through the introduction of oxygen vacancies, indicating the critical role that nominal Fe valence plays in optical absorption. Dynamic optoelectronic properties were studied with ultrafast transient reflectance spectroscopy, revealing similar nanosecond photoexcited carrier lifetimes for oxygen deficient and stoichiometric films with the same nominal Fe valence. Furthermore, these results demonstrate that while the static optical absorption is strongly dependent on nominal Fe valence tuned through cation or anion stoichiometry, oxygen vacancies do not appear to play a significantly detrimental role in the recombination kinetics.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC00112704

OSTI ID:: 1253279

Report Number(s):: BNL-112115-2016-JA; KC0403020

Journal Information:: Chemistry of Materials, Vol. 28, Issue 1; ISSN 0897-4756

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 31 works

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Title: Static and dynamic optical properties of La_1-xSr_xFeO_3-δ: The effects of A-site and oxygen stoichiometry