Static and Dynamic Optical Properties of La1–xSrxFeO3−δ: The Effects of A-Site and Oxygen Stoichiometry
| Autor: | Jason B. Baxter, Amber K. Choquette, Sergey Y. Smolin, Steven J. May, Matthew Y. Sfeir, Mark D. Scafetta |
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| Rok vydání: | 2015 |
| Předmět: |
Valence (chemistry)
Materials science Absorption spectroscopy General Chemical Engineering Analytical chemistry chemistry.chemical_element 02 engineering and technology General Chemistry Nanosecond 010402 general chemistry 021001 nanoscience & nanotechnology Epitaxy 01 natural sciences Oxygen 0104 chemical sciences Absorption edge chemistry Chemical physics Attenuation coefficient Materials Chemistry Photocatalysis 0210 nano-technology |
| Zdroj: | Chemistry of Materials. 28:97-105 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.5b03273 |
| Popis: | 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 La1–xSrxFeO3−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 opt... |
| Databáze: | OpenAIRE |
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