Manipulation of Optical Transmittance by Ordered-Oxygen-Vacancy in Epitaxial LaBaCo2O5.5+δ Thin Films
- Xi'an Jiaotong Univ., Xi'an (China). School of Electronic and Information Engineering
- Chinese Academy of Sciences, Changchun (China). Changchun Inst. of Optics, Fine Mechanics and Physics and State Key Lab. of Luminescence and Applications
- Xidian Univ., Xi'an (China). School of Microelectronics and State Key Discipline Lab. of Wide Band Gap Semiconductor Technology
- Xi'an Jiaotong Univ., Xi'an (China). State Key Lab. for Mechanical Behavior of Materials
- Rensselaer Polytechnic Inst., Troy, NY (United States). Dept. of Physics, Applied Physics, and Astronomy
- Univ. of Texas, San Antonio, TX (United States). Dept. of Physics and Astronomy; Univ. of Houston, TX (United States). The Texas Center for Superconductivity
Giant optical transmittance changes of over 300% in wide wavelength range from 500 nm to 2500 nm were observed in LaBaCo2O5.5+δ thin films annealed in air and ethanol ambient, respectively. The reduction process induces high density of ordered oxygen vacancies and the formation of LaBaCo2O5.5 (δ = 0) structure evidenced by aberration-corrected transmission electron microscopy. Moreover, the first-principles calculations reveal the origin and mechanism of optical transmittance enhancement in LaBaCo2O5.5 (δ = 0), which exhibits quite different energy band structure compared to that of LaBaCo2O6 (δ = 0.5). The discrepancy of energy band structure was thought to be the direct reason for the enhancement of optical transmission in reducing ambient. Thus, LaBaCo2O5.5+δ thin films show great prospect for applications on optical gas sensors in reducing/oxidizing atmosphere.
- Research Organization:
- Rensselaer Polytechnic Inst., Troy, NY (United States)
- Sponsoring Organization:
- USDOE; National Natural Science Foundation of China (NSFC); National Basic Research Program of China
- Grant/Contract Number:
- SC0002623; 51202185; 51390472; 51501143; 2015CB654903; 11504368; 51572211; 51202176
- OSTI ID:
- 1430215
- Journal Information:
- Scientific Reports, Vol. 6, Issue 1; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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