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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Difference in electronic structure between tetragonal and cubic SrNbO2N

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Title
Difference in electronic structure between tetragonal and cubic SrNbO2N
Other Titles
Difference in electronic structure between tetragonal and cubic SrNbO2N
Author
Borse, Pramod H.Kim, Hyun G.Lee, Jae Sung
Keywords
PHOTOCATALYTIC ACTIVITY; VISIBLE-LIGHT; METALS; NB; TA
Issue Date
2005-08
Publisher
AMER INST PHYSICS
Citation
JOURNAL OF APPLIED PHYSICS, v.98, no.4, pp.043706 -
Abstract
We report here a comparative study of the electronic structure of earlier known cubic phase and the recently, reported correct tetragonal phase of SrNbO2N. We performed the calculations within the framework of density-functional theory (DFT) by using the WIEN97 code. The valence band consists of N 2p while the conduction band consists of Nb 4d in cubic system; on the contrary, these Nb 4d states show a strong interaction with anion p states in tetragonal system and indicate theoretically, a metallic behavior. The direct forbidden gap of tetragonal system was 0 eV, whereas for cubic system was 0.2 eV; the relative difference in the band gap of two systems is possibly attributed to the high covalency and is possibly acquired due to the presence of the shorter bond length of Nb - N than that of Nb-O in the tetragonal system. The results of electronic structures have been discussed in the light of optical applications of this oxynitride in solar energy conversion. The calculated optical-absorption coefficient I(w) from real and imaginary parts of dielectric function, further clarifies the suitability of the application. (c) 2005 American Institute of Physics
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DOI
10.1063/1.2032612
ISSN
0021-8979
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ECHE_Journal Papers
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