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Investigation of dark and light conductivities in calcium doped bismuth ferrite thin films

Kianinia, M ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1016/j.matlet.2011.06.052
  3. Publisher: 2011
  4. Abstract:
  5. Electrical conductivities in dark and light were investigated in Calcium doped Bismuth Ferrite thin films. Higher dark conductivity, in the order of 10 times higher than conductivity of bismuth ferrite, was observed for Bi 0.85Ca0.15FeO3 - δ. Structural analyses using Rietveld refinement showed a deviation from volume reduction for Bi 0.85Ca0.15FeO3 - δ which could be the reason of abnormally high conductivity for this compound. Although higher calcium doping reduced conductivity, photoconductivity was observed again. Atomic Force Microscopy investigations showed that surface roughness and grain size decreased with increasing calcium concentration. Enhanced photoconductivity is reported for Bi0.7Ca0.3FeO3 - δ with ∼ 2.8 eV direct optical band gap at 300 K with surface roughness of ∼ 2 nm
  6. Keywords:
  7. Ca doped BiFeO3 ; Electrical properties ; Structural analyses ; Bismuth ferrites ; Ca-doped ; Calcium concentration ; Calcium doping ; Dark conductivity ; Electrical property ; Grain size ; High conductivity ; Volume reductions ; Atomic force microscopy ; Bismuth ; Bismuth compounds ; Electric conductivity ; Ferrites ; Investments ; Iron oxides ; Photoconductivity ; Photoelectricity ; Rietveld refinement ; Semiconductor doping ; Surface properties ; Surface roughness ; Thin films ; Calcium
  8. Source: Materials Letters ; Volume 65, Issue 19-20 , October , 2011 , Pages 3086-3088 ; 0167577X (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0167577X11006951