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Title: Manipulation of Optical Transmittance by Ordered-Oxygen-Vacancy in Epitaxial LaBaCo2O5.5+δ Thin Films

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep37496· OSTI ID:1430215
 [1];  [1];  [2];  [1];  [3];  [4];  [5];  [6]
  1. Xi'an Jiaotong Univ., Xi'an (China). School of Electronic and Information Engineering
  2. Chinese Academy of Sciences, Changchun (China). Changchun Inst. of Optics, Fine Mechanics and Physics and State Key Lab. of Luminescence and Applications
  3. Xidian Univ., Xi'an (China). School of Microelectronics and State Key Discipline Lab. of Wide Band Gap Semiconductor Technology
  4. Xi'an Jiaotong Univ., Xi'an (China). State Key Lab. for Mechanical Behavior of Materials
  5. Rensselaer Polytechnic Inst., Troy, NY (United States). Dept. of Physics, Applied Physics, and Astronomy
  6. 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
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

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