Spraying distance and titanium chloride surface treatment effects on DSSC performance of electrosprayed SnO2 photoanodes

Title
Spraying distance and titanium chloride surface treatment effects on DSSC performance of electrosprayed SnO2 photoanodes
Authors
주오심Rajaram S. maneShoyebmohamad F. Shaikh
Issue Date
2014-04
Publisher
RSC advances
Citation
VOL 4, NO 68-35927
Abstract
A facile electrospray synthesis method and potential dye sensitized solar cell (DSSC) application of SnO2 photoanodes (of ∼10 μm thickness) have been investigated. Nanocrystallites with irregular dimensions have similar crystallite sizes and appearance when the distance between fluorine– tin-oxide (FTO) substrate and metal capillary was increased from 4 to 8 cm (maximum limit). However, increase in metal capillary distance caused reduction in charge transfer resistance and a negative shift in the flat band potential. As a result, electron lifetime was increased with the open circuit voltage (410 to 510 mV). Under 1 sun light intensity, the SnO2 photoanode (obtained at 8 cm) by a thin layer of TiO2 exhibited as high as 5.56% power conversion efficiency which was ∼350% higher than only SnO2 (1.66%) photoanode. This enhanced DSSCs performance could be attributed to better dye adsorption and increased active surface area, or boosted light-harvesting efficiency. The presence of TiO2 layer on SnO2 photoanode was confirmed with X-ray diffraction and Raman shift analysis measurements. The electrochemical impedance spectroscopy revealed increased electron lifetime and suppressed charge recombination for SnO2 photoanode that was modified with TiO2 compact surface layer.
URI
http://pubs.kist.re.kr/handle/201004/69838
ISSN
2046-2069
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KIST Publication > Article
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