Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 98, Issue -, Pages 154-160Publisher
ELSEVIER
DOI: 10.1016/j.solmat.2011.10.030
Keywords
Photoelectrochromic; Prussian blue; Nanocrystalline TiO2; Response time
Funding
- Science and Engineering Research Council, Agency for Science, Technology and Research (A*STAR) of Singapore [092 101 0057, 092 151 0088]
- National Natural Science Foundation of China (NSFC) [61006037, 61076015]
- [NRF-RF-2009-09]
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We report a fast-switching negative photoelectrochromic cell composed of a dye-sensitized nanocrystalline TiO2 electrode and Prussian blue counter electrode sandwiching a LiI electrolyte. The cell can be bleached under illumination with shorted TiO2 and Prussian blue electrodes, and re-colored by applying an appropriate external voltage. The photo-bleaching and electric-coloring processes are fast and reversible. A maximum absorbance modulation of 0.44 recorded at 700 nm is obtained between bleached and colored states for the cell when the PB film's thickness is 452 nm. Illuminated under different levels of light intensity or durations of time, the shorted cell shows adjustable optical absorption from 470 to 840 nm. The in-situ transmittance response depicts that the photo-bleaching response is 6.2 s for 70% transmittance change under 100 mW/cm(2) illumination in short circuit configuration, and the re-coloration time is about 600 ms under 2 V bias recorded at 780 nm, with an electrochromic coloration efficiency of 103.4 cm(2)/C. The cell shows a good reversible stability and can be potentially applied in erasable displays. (C) 2011 Elsevier B.V. All rights reserved.
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