Publication Type:Journal Article
Source:Applied Physics Letters, Volume 96, Number 13 (2010)
Keywords:absorption, Absorption onset, Absorption spectroscopy, Band gaps, Blue-shifted, Charge transfer, Charge-transfer excitations, Epitaxially grown, Ion exchange, light transmission, Local symmetry, near infrared, Near ultraviolet, optical properties, Optical transmission spectroscopy, spectroscopic ellipsometry, Structural strain, thin films
Optical transmission spectroscopy and spectroscopic ellipsometry were used to extract the optical properties of an epitaxially grown quasi-tetragonal BiFeO3 thin film in the near infrared to near ultraviolet range. The absorption spectrum is overall blue shifted compared with that of rhombohedral BiFeO3, with an absorption onset near 2.25 eV, a direct 3.1 eV band gap, and charge transfer excitations that are ∼0.4 eV higher than those of the rhombohedral counterpart. We interpret these results in terms of structural strain and local symmetry breaking. © 2010 American Institute of Physics.
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