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Title: The enhanced photocurrent of epitaxial BiFeO{sub 3} film at 130 °C

The short-circuit photocurrent (I{sub SC}) that can be reversed by polarization switch enhances with temperature increasing to 130 °C in the epitaxial BiFeO{sub 3} thin film on SrTiO{sub 3} substrate. The La{sub 2/3}Sr{sub 1/3}MnO{sub 3}/BiFeO{sub 3}/indium tin oxide (In{sub 2}O{sub 3}:SnO{sub 2} = 9:1) junction shows the current rectifying characteristic and the photovoltaic effect at 20–130 °C. Importantly, the I{sub SC} can be reversed by the polarization switch in this temperature range. More charge carriers are activated and the density of free electrons enhances with the increase in the temperature, which results in the decrease in the depletion layer width. As a result, the open-circuit voltage decreases 50% and the I{sub SC} increases from 180 nA to 404 nA with the increase in the temperature from 20 °C to 130 °C. This suggests that the corresponding sensors and devices can be used at a relatively high temperature.
Authors:
; ; ;  [1] ;  [1] ;  [2] ;  [3] ;  [4]
  1. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094 (China)
  2. (China)
  3. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 (China)
  4. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 (China)
Publication Date:
OSTI Identifier:
22494940
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 119; Journal Issue: 4; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AUGMENTATION; CHARGE CARRIERS; CURRENTS; DENSITY; DEPLETION LAYER; ELECTRIC POTENTIAL; ELECTRICAL FAULTS; EPITAXY; INDIUM; INDIUM OXIDES; JOINTS; PHOTOVOLTAIC EFFECT; POLARIZATION; SEMICONDUCTOR JUNCTIONS; SENSORS; STRONTIUM TITANATES; SUBSTRATES; THIN FILMS; TIN OXIDES; WIDTH