Journal
JOURNAL OF APPLIED ELECTROCHEMISTRY
Volume 45, Issue 4, Pages 289-298Publisher
SPRINGER
DOI: 10.1007/s10800-015-0788-1
Keywords
Dye-sensitized solar cells; Gel polymer electrolyte; Polyacrylonitrile; Light intensity; Low light irradiation; Efficiency enhancement
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Funding
- National Research Council (NRC) of Sri Lanka [11-196]
- Swedish Research Council (SRC)
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Polyacrylonitrile-based gel electrolytes were prepared using tetrapropylammonium iodide salt for dye-sensitized solar cells (DSSCs). The optimized gel electrolyte exhibited an ionic conductivity of 2.6 mS cm(-1) at 25 A degrees C and the DSSC fabricated with this gel electrolyte showed open-circuit voltage, short-circuit current density, fill factor, and efficiency of 0.71 V, 11.8 mA, 51, and 4.2 %, respectively, under one sun irradiation. The efficiency of the cell increases increased with decreasing solar irradiance achieving 10 % efficiency and 80 % fill factor at 3 mW cm(-2) a low irradiance value of 3 mW cm(-2). Lower efficiencies at higher intensities were attributed to transport limitation of the redox mediators at high irradiation intensities. This work suggests that quasi-solid state DSSCs can reach efficiencies close to that of liquid electrolyte-based cells at low irradiance levels. The results open up new vistas on efficiency improvement in DSSCs by optical manipulation and control of DSSCs.
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