Structural and pyroelectric properties of sol-gel derived multiferroic BFO thin films

Journal Article · Wed Feb 15 04:00:00 EST 2012 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2011.11.009· OSTI ID:22212430

Jo, Seo-Hyeon ^[1]; Lee, Sung-Gap ^[1]; Lee, Seung-Hwan ^[2]

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1. Dept. of Ceramic Engineering, Eng. Res. Insti., Gyeongsang National University, Jinju, Gyeongnam 660-701 (Korea, Republic of)
2. Dept. of Electronic Materials Engineering, Kwangwoon University, Seoul 139-701 (Korea, Republic of)

Highlights: Black-Right-Pointing-Pointer We fabricated multiferroic BFO/PZT multilayer films by spin-coating method. Black-Right-Pointing-Pointer The trap centers of carriers were formed at the interfaces between BFO and PZT films. Black-Right-Pointing-Pointer The ferroelectric properties were superior to those of single composition BFO film. -- Abstract: Multiferroic BFO/PZT multilayer films were fabricated by spin-coating method on the (1 1 1)Pt/Ti/SiO{sub 2}/Si substrate alternately using PZT(30/70), PZT(70/30) and BFO alkoxide solutions. The structural and ferroelectric properties were investigated for uncooled infrared detector applications. The coating and heating procedure was repeated six times to form BFO/PZT multilayer films. All films showed the typical XRD patterns of the perovskite polycrystalline structure without presence of the second phase such as Bi{sub 2}Fe{sub 4}O{sub 3}. The thickness of BFO/PZT multilayer film was about 200-220 nm. The ferroelectric properties such as dielectric constant, remnant polarization and pyroelectric coefficient were superior to those of single composition BFO film, and those values for BFO/PZT(70/30) multilayer film were 288, 15.7 {mu}C/cm{sup 2} and 9.1 Multiplication-Sign 10{sup -9} C/cm{sup 2} K at room temperature, respectively. Leakage current density of the BFO/PZT(30/70) multilayer film was 3.3 Multiplication-Sign 10{sup -9} A/cm{sup 2} at 150 kV/cm. The figures of merit, F{sub V} for the voltage responsivity and F{sub D} for the specific detectivity, of the BFO/PZT(70/30) multilayer film were 6.17 Multiplication-Sign 10{sup -11} Ccm/J and 6.45 Multiplication-Sign 10{sup -9} Ccm/J, respectively.

• OSTI ID: 22212430
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 2 Vol. 47; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON 9
CERAMICS
DENSITY
FERROELECTRIC MATERIALS
LAYERS
PERMITTIVITY
PEROVSKITE
POLYCRYSTALS
PZT
SILICON OXIDES
SUBSTRATES
THIN FILMS
X-RAY DIFFRACTION