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Journal article
Visible light carrier generation in co-doped epitaxial titanate films
Applied physics letters, v 106(9), p92901
02 Mar 2015
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Abstract
Perovskite titanates such as SrTiO3 (STO) exhibit a wide range of important functional properties, including ferroelectricity and excellent photocatalytic performance. The wide optical band gap of titanates limits their use in these applications; however, making them ill-suited for integration into solar energy harvesting technologies. Our recent work has shown that by doping STO with equal concentrations of La and Cr, we can enhance visible light absorption in epitaxial thin films while avoiding any compensating defects. In this work, we explore the optical properties of photoexcited carriers in these films. Using spectroscopic ellipsometry, we show that the Cr3+ dopants, which produce electronic states immediately above the top of the O 2p valence band in STO reduce the direct band gap of the material from 3.75 eV to 2.4-2.7 eV depending on doping levels. Transient reflectance spectroscopy measurements are in agreement with the observations from ellipsometry and confirm that optically generated carriers are present for longer than 2 ns. Finally, through photoelectrochemical methylene blue degradation measurements, we show that these co-doped films exhibit enhanced visible light photocatalysis when compared to pure STO. (C) 2015 AIP Publishing LLC.
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Details
- Title
- Visible light carrier generation in co-doped epitaxial titanate films
- Creators
- Ryan B. Comes - Pacific Northwest National LaboratorySergey Y. Smolin - Drexel UniversityTiffany C. Kaspar - Pacific Northwest National LaboratoryRan Gao - University of California, BerkeleyBrent A. Apgar - University of California, BerkeleyLane W. Martin - University of California, BerkeleyMark E. Bowden - Environmental Molecular Sciences LaboratoryJason B. Baxter - Drexel UniversityScott A. Chambers - Pacific Northwest National Laboratory
- Publication Details
- Applied physics letters, v 106(9), p92901
- Publisher
- American Institute of Physics
- Number of pages
- 5
- Grant note
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER) PNNL LDRD PN13100/2581 / Linus Pauling Distinguished Post-doctoral Fellowship at Pacific Northwest National Laboratory ECCS-1201957; DMR-1124696 / National Science Foundation; National Science Foundation (NSF) 10122 / PNNL by the U.S. Department of Energy, Office of Science, Division of Materials Sciences and Engineering; United States Department of Energy (DOE) Japanese Ministry of Education, Culture, Sport, Science and Technology; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) DMR-0922929 / NSF MRI; National Science Foundation (NSF); NSF - Office of the Director (OD) Department of Energy's Office of Biological and Environmental Research; United States Department of Energy (DOE) 1201957 / Directorate For Engineering; National Science Foundation (NSF); NSF - Directorate for Engineering (ENG) FA9550-12-1-0471 / Air Force Office of Scientific Research; United States Department of Defense; Air Force Office of Scientific Research (AFOSR)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000351069900039
- Scopus ID
- 2-s2.0-84923876443
- Other Identifier
- 991019168041804721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Physics, Applied