Title: Raman Vibrations, Domain Structures, and Photovoltaic Effects in A‐Site La‐Modified BiFeO 3 Multiferroic Ceramics

Journal Article · · Journal of the American Ceramic Society
DOI: https://doi.org/10.1111/jace.13983 · OSTI ID:1400725
 [1];  [2];  [3];  [1];  [4];  [4];  [3];  [5];  [1];
  1. Department of Physics Fu Jen Catholic University New Taipei City 24205 Taiwan
  2. Department of Mechanical Engineering Hwa Hsia University of Technology New Taipei City 23567 Taiwan
  3. Department of Mechanical Engineering Ming Chi University of Technology New Taipei City 24301 Taiwan
  4. Department of Physics Montana State University Bozeman Montana 59717
  5. National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan

Micro‐Raman spectroscopy, X‐ray diffraction, high‐resolution transmission electron microscopy ( TEM ), oxygen vacancies, synchrotron X‐ray absorption spectroscopy, magnetizations, optical band gaps, and photovoltaic ( PV ) effects have been studied in (Bi 1− x La x )FeO 3 ( BFO 100 x L) ceramics for x = 0.0, 0.05, 0.10, and 0.15. XRD , Raman spectra, and TEM confirm a rhombohedral R 3 c symmetry with the tilted FeO 6 oxygen octahedra in all compounds. The low‐frequency Raman vibrations become broader and shift toward higher frequency as La 3+ increases. Fe K‐edge synchrotron X‐ray absorptions reveal that Fe 3+ valence and Fe–O–Fe bond angle are not modified by the La 3+ substitution. All compounds exhibit a linear antiferromagnetic feature. Optical transmission reveals band gaps in the range of 2.22–2.24 eV. The heterostructures of indium tin oxide ( ITO ) film/(Bi 1− x La x )FeO 3 ceramics/Au film show a p – n junction‐like I – V characteristic behavior. The maximal PV power conversion efficiency can reach 0.19% in ITO / BFO 15L/Au under illumination of λ = 405 nm. A junction‐like theoretical model can reasonably describe open‐circuit voltage and short‐circuit current as a function of illumination intensity.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1400725
Journal Information:
Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 2 Vol. 99; ISSN 0002-7820
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United States
Language:
English

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