Photoconductivity in BiFeO3 thin films

Publication Type

Journal Article

Authors

DOI

Abstract

The optical properties of epitaxial BiFe O3 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 BiFe O3 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. © 2008 American Institute of Physics.

Journal

Applied Physics Letters

Volume

92

Year of Publication

2008

ISSN

00036951

Notes

cited By 370

Research Areas