Ultrathin SnO2 layer for efficient carrier collection in dye-sensitized solar cells

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An ultrathin SnO2 layer was introduced as a blocking layer in dye-sensitized solar cells (DSSCs) for improving conversion efficiency. The SnO2 blocking layer, composed of approximately 10 nm nanoparticles, was deposited on the fluorine-doped tin oxide (FTO) coated glass by SnCl4 treatment, a simple and inexpensive method. This SnO2 blocking layer increased the onset of dark current from FTO to electrolyte, suppressing charge recombination at the FTO/electrolyte interface. The cascading band structure of TiO2 and SnO2 increased the charge carrier lifetime, resulting in effective charge collection. Examining DSSC performance as a function of SnCl4 treatment time, a peak conversion efficiency of 7.33% was achieved for a SnCl4 treatment time of 15 min (SnO2 layer thickness similar to 12 nm), compared to 6.08% for an untreated cell. Also, compared to a TiO2 blocking layer, the SnO2 blocking layer showed a higher performance.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2014-04
Language
English
Article Type
Article
Keywords

THIN-FILMS; PHOTOELECTROCHEMICAL CELLS; CONVERSION EFFICIENCY; PHOTOANODE MATERIAL; DEPOSITION; RECOMBINATION; PHOTOCATALYST; NANOCRYSTALS; DEGRADATION; PERFORMANCE

Citation

THIN SOLID FILMS, v.556, pp.503 - 508

ISSN
0040-6090
DOI
10.1016/j.tsf.2014.01.008
URI
http://hdl.handle.net/10203/188866
Appears in Collection
MS-Journal Papers(저널논문)
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