Giant persistent photoconductivity in BaTiO{sub 3}/TiO{sub 2} heterostructures
- Ruđer Bošković Institute, Bijenička 54, HR-10002 Zagreb (Croatia)
- Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana (Slovenia)
The persistent photoconductivity (PPC) effect in nanotube arrays of barium titanate and TiO{sub 2} (BTO/TiO{sub 2}NT) was studied at room temperature under daylight illumination. The BTO/TiO{sub 2}NT heterostructures exhibited a giant PPC effect that was six orders of magnitude higher than the dark conductivity, followed by a slow relaxation for 3 h. The PPC in this material was explained by the existence of defects at the surfaces and the interfaces of the investigated heterostructures. The sample was prepared using a two-step synthesis: the anodization of a Ti-foil and a subsequent hydrothermal synthesis. The structural and electrical characteristics were studied by micro-Raman spectroscopy, field-emission-gun scanning electron microscopy, and impedance spectroscopy.
- OSTI ID:
- 22350895
- Journal Information:
- Applied Physics Letters, Vol. 105, Issue 15; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANODIZATION
BARIUM COMPOUNDS
DEFECTS
FIELD EMISSION
FOILS
HYDROTHERMAL SYNTHESIS
ILLUMINANCE
IMPEDANCE
INTERFACES
NANOTUBES
PHOTOCONDUCTIVITY
RAMAN SPECTROSCOPY
RELAXATION
SCANNING ELECTRON MICROSCOPY
SURFACES
TEMPERATURE RANGE 0273-0400 K
TITANATES
TITANIUM OXIDES