BiFeO3 Thin Films Deposition by Sol-Gel and Dip Coating Process

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Kianinia, Mehran | 2010

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 41007 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Nemati, Ali; Alizadeh, Masoud
Abstract:
Dark and light conductivity has been investigated in Ca-doped bismuth ferrite thin films. Higher conductivity in the order of 105 magnitude of pure Bismuth ferrite has been observed for Bi0.85Ca0.15FeO3-δ. Structural analysis using Rietveld refinement showed a deviation from volume reduction for Bi0.85Ca0.15FeO3-δ that could be the reason of the abnormally high conductivity for this compound. Although higher calcium doping reduced conductivity but photoresponse could be revived. Atomic Forec Microscopy investigations showed that surface roughness decreases with increasing calcium concentration. Enhanced photoconductivity is reported for Bi0.7Ca0.3FeO3-δ with ~2.9 eV direct optical band gap at 300 K and ~ 2 nm surface roughness.
Keywords:
Sol-Gel Method ; Thin Films ; Ellipsometery ; Photoconductivity ; Dipping ; Calciume Doped Bismuth Ferrite

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