期刊
THIN SOLID FILMS
卷 493, 期 1-2, 页码 24-29出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2005.06.020
关键词
bismuth ferrite; dielectric properties; leakage currents; interfaces
Polycrystalline BiFeO3 thin films of various thickness were fabricated on (111)Pt/Ti/SiO2/Si substrates via chemical solution deposition. The electrical properties were investigated using impedance and leakage current measurements. X-ray photoelectron spectroscopy (XPS) combined with Ar ion milling (depth profiling) was used to investigate elemental distribution near the electrode-film interface. It is shown that the dielectric constant depends on film thickness due to the presence of an interfacial film-electrode layer evidenced by XPS investigation. Direct current conductivity is found to be governed by Schottky and/or Poole-Frenkel mechanisms. (c) 2005 Published by Elsevier B.V.
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