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Effect of simultaneous chemical substitution of A and B sites on the electronic structure of BiFeO3 films grown on BaTiO 3/SiO2/Si substrate

Ahadi, K ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1007/s10854-013-1069-6
  3. Publisher: 2013
  4. Abstract:
  5. Electrical properties and electronic structure of Bi1-xCa xFe1-yMnyO3-δ grown by pulsed-laser deposition on BaTiO3/SiO2/Si substrate were investigated. Results showed that Ca has drastic effect on symmetry of crystal and electrical poperties of BiFeO3. On the other hand, Mn revealed to have more radical effect on optical properties and energy gap of the compound. XPS results represented that although Ca tend to decrease Fe valence state, Mn tends to stabilize it at 3+ (at least in this concentrations). UV-visible study yielded bandgap of 2.51-2.81 eV (at 300 K) for different concentrations of Ca and Mn. UV-visible spectra also revealed sub-bandgap defect transitions at 2.2 and 2.4 eV. Slave-particle approach has also been applied to elucidate nature of the metal-insulator transition
  6. Keywords:
  7. Batio ; Chemical substitution ; Fe valence ; Radical effect ; Sub-bandgap ; UV-visible ; UV-Visible spectra ; Barium compounds ; Calcium ; Crystal symmetry ; Electric properties ; Electronic structure ; Energy gap ; Iron compounds ; Manganese ; Optical properties ; Pulsed laser deposition ; Semiconductor insulator boundaries ; Silicon ; Bismuth compounds
  8. Source: Journal of Materials Science: Materials in Electronics ; Volume 24, Issue 6 , 2013 , Pages 2128-2134 ; 09574522 (ISSN)
  9. URL: http://link.springer.com/article/10.1007/s10854-013-1069-6#/page-1