Department of Physics and Astronomy: Publications and Other Research
Date of this Version
2008
Document Type
Article
Citation
Appl. Phys. Lett. 92, 091905 (2008)
Abstract
The optical properties of epitaxial BiFeO3 thin films have been characterized in the visible range. Variable temperature spectra show an absorption onset near 2.17 eV, a direct gap (2.667±0.005 eV at 300 K), and charge transfer excitations at higher energy. Additionally, we report photoconductivity in BiFeO3 films under illumination from a 100 mW/cm2 white light source. A direct correlation is observed between the magnitude of the photoconductivity and postgrowth cooling pressure. Dark conductivities increased by an order of magnitude when comparing films cooled in 760 and 0.1 Torr. Large increases in photoconductivity are observed in light.
Included in
Atomic, Molecular and Optical Physics Commons, Condensed Matter Physics Commons, Engineering Physics Commons
Comments
Used by permission.