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Title: Calcium-doping effects on photovoltaic response and structure in multiferroic BiFeO{sub 3} ceramics

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.
Authors:
 [1] ;  [2] ; ;  [1] ; ; ;  [3] ; ;  [4]
  1. Graduate Institute of Applied Science and Engineering, Fu Jen Catholic University, New Taipei City 24205, Taiwan (China)
  2. (China)
  3. Department of Physics, Fu Jen Catholic University, New Taipei City 24205, Taiwan (China)
  4. Department of Physics, Montana State University, Bozeman, Montana 59717 (United States)
Publication Date:
OSTI Identifier:
22217982
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 12; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CALCIUM; CERAMICS; CONVERSION; CURRENT DENSITY; CURRENTS; DOPED MATERIALS; EFFICIENCY; ELECTRIC CONDUCTIVITY; ELECTRIC POTENTIAL; FERRITES; FERROELECTRIC MATERIALS; GRAPHENE; INDIUM; IRON OXIDES; PHOTOVOLTAIC EFFECT; THIN FILMS; TIN OXIDES; TRIGONAL LATTICES