skip to main content

SciTech ConnectSciTech Connect

Title: Giant persistent photoconductivity in BaTiO{sub 3}/TiO{sub 2} heterostructures

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.
Authors:
; ;  [1] ; ;  [2]
  1. Ruđer Bošković Institute, Bijenička 54, HR-10002 Zagreb (Croatia)
  2. Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana (Slovenia)
Publication Date:
OSTI Identifier:
22350895
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 15; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, 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