Photocurrent enhancement of chemically synthesized Ag nanoparticle-embedded BiFeO sub(3) thin films

BiFeO sub(3) and Ag nanoparticle-embedded BiFeO sub(3) thin films were prepared on Pt/TiO sub(x)/SiO sub(2)/Si and MgO(100) substrates using colloidal silver and BiFeO sub(3) metal-organic precursor solutions. Colloidal silver solution was prepared by a chemical reductive method using NaBH sub(4) as...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2016-10, Vol.55 (10), p.10TA14-10TA14
Main Authors: Maruyama, Rika, Sakamoto, Wataru, Yuitoo, Isamu, Takeuchi, Teruaki, Hayashi, Koichiro, Yogo, Toshinobu
Format: Article
Language:English
Subjects:
Nanoparticles
Nanostructure
Photocurrent
Photoelectric effect
Silicon substrates
Silver
Synthesis
Thin films
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Summary:BiFeO sub(3) and Ag nanoparticle-embedded BiFeO sub(3) thin films were prepared on Pt/TiO sub(x)/SiO sub(2)/Si and MgO(100) substrates using colloidal silver and BiFeO sub(3) metal-organic precursor solutions. Colloidal silver solution was prepared by a chemical reductive method using NaBH sub(4) as a reductant. The prepared Ag nanoparticles exhibited characteristic optical absorption properties based on their surface plasmon resonance related to particle size. The synthesized BiFeO sub(3) and Ag nanoparticle/BiFeO sub(3) thin films demonstrated rapid on/off responses of photocurrent to visible light. The Ag nanoparticle-incorporated BiFeO sub(3) film exhibited a 2-4-fold higher photocurrent than the BiFeO sub(3) film. Optical and ferroelectric properties did not change markedly even when Ag nanoparticles were embedded in the BiFeO sub(3) thin film within the quantities of this study. Furthermore, in the Ag nanoparticle/BiFeO sub(3) composite structure, Ag nanoparticles were introduced in the near-metallic state with maintained their nanometer size. In the Ag nanoparticle-embedded BiFeO sub(3) film, photoinduced charge separation and transport of photoexcited carriers were enhanced by the surface plasmon effect of nanosized Ag particles as well as the internal bias electric field existed in the narrow-bandgap BiFeO sub(3) thin film.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.55.10TA14