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Substitution effect of pentavalent bismuth ions on the electronic structure and physicochemical properties of perovskite-structured Ba(In0.5Ta0.5-xBix)O3 semiconductors

Title
Substitution effect of pentavalent bismuth ions on the electronic structure and physicochemical properties of perovskite-structured Ba(In0.5Ta0.5-xBix)O3 semiconductors
Authors
Kim T.W.Hur S.G.Hwang S.-J.Park H.Park Y.Choi W.Choy J.-H.
Ewha Authors
최진호황성주
SCOPUS Author ID
최진호scopus; 황성주scopus
Issue Date
2007
Journal Title
Materials Research Bulletin
ISSN
0025-5408JCR Link
Citation
vol. 42, no. 11, pp. 1914 - 1920
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We have investigated the substitution effect of pentavalent bismuth ions on the electronic structure and physicochemical properties of barium indium tantalate. X-ray diffraction, X-ray absorption spectroscopic, and energy dispersive spectroscopic microprobe analyses reveal that, under oxygen atmosphere of 1 atm, pentavalent Bi ions are successfully stabilized in the octahedral site of the perovskite tantalate lattice. According to diffuse reflectance UV-vis spectroscopic analysis, the Bi substitution gives rise to the significant narrowing of band gap of barium indium tantalate even at a low Bi content of ∼5%, underscoring a high efficiency of Bi substitution in the band gap engineering. Such an effective narrowing of the band gap upon the Bi substitution would be attributable to the lowering of conduction band position due to the high electronegativity of BiV substituent. As a result of band gap engineering, the Ba(In0.5Ta0.5-xBix)O3 compounds with x ≥ 0.03 can generate photocurrents under visible light irradiation (λ > 420 nm). Based on the present experimental findings, it becomes clear that the substitution of highly electronegative p-block element like BiV ion can provide a very powerful tool for tailoring the electronic structure and physicochemical properties of wide band gap semiconductors. © 2007 Elsevier Ltd. All rights reserved.
DOI
10.1016/j.materresbull.2006.12.010
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자연과학대학 > 화학·나노과학전공 > Journal papers
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