Calcium-doping effects on photovoltaic response and structure in multiferroic BiFeO{sub 3} ceramics
- Graduate Institute of Applied Science and Engineering, Fu Jen Catholic University, New Taipei City 24205, Taiwan (China)
- Department of Physics, Fu Jen Catholic University, New Taipei City 24205, Taiwan (China)
- Department of Physics, Montana State University, Bozeman, Montana 59717 (United States)
Photovoltaic (PV) effects, power-conversion efficiencies, and structures have been systematically measured in (Bi{sub 1−x}Ca{sub x})FeO{sub 3−δ} ceramics for x = 0.05, 0.10, and 0.15. The heterostructures of indium tin oxide (ITO) film/(Bi{sub 1−x}Ca{sub x})FeO{sub 3−δ} ceramics/Au film exhibit significant PV effects under illumination of λ = 405 nm. The maximum power-conversion efficiency in the ITO/(Bi{sub 0.90}Ca{sub 0.10})FeO{sub 2.95} (BFO10C)/Au can reach 0.0072%, which is larger than 0.0025% observed in the graphene/polycrystalline BFO/Pt films [Zang et al., Appl. Phys. Lett. 99, 132904 (2011)]. A theoretical model based on optically excited current in the depletion region between ITO film and Ca-doped BFO ceramics is used to describe the I-V characteristic, open-circuit voltage, and short-circuit current density as a function of illumination intensity. This work suggests that the Ca-substitution can reduce the rhombohedral distortion and stabilize the single-phase structure.
- OSTI ID:
- 22217982
- Journal Information:
- Journal of Applied Physics, Vol. 114, Issue 12; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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