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Efficiency enhancement in dye sensitized solar cells based on PAN gel electrolyte with Pr4NI + MgI2 binary iodide salt mixture
Ist Teil von
Journal of applied electrochemistry, 2013-09, Vol.43 (9), p.891-901
Ort / Verlag
Dordrecht: Springer Netherlands
Erscheinungsjahr
2013
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The effect of using a binary iodide salt mixture in N719 dye-sensitized TiO
2
solar cells (DSSCs) is investigated. The cells use tetrapropylammonium iodide (Pr
4
NI) and magnesium iodide (MgI
2
) in a plasticized polyacrylonitrile gel in glass/FTO/nano-porous TiO
2
/gel, I
2
/Pt/FTO/glass solar cell structure. The salt composition in the gel electrolyte is varied to optimize the efficiency of DSSCs. The DSSCs with MgI
2
or Pr
4
NI as the only iodide salt showed the efficiencies 2.56 and 4.16 %, respectively, under AM 1.5 (100 mW cm
−2
) illumination while the DSSC with mixed cations with 18.4:81.6 MgI
2
:Pr
4
NI molar ratio shows the highest efficiency of 5.18 %. Thus the efficiency enhancement, relative to the high efficiency end member is about 25 %. DC polarization measurements establish the predominantly ionic behavior of the electrolytes, and show that the variation of efficiency with salt composition correlates with the change in short circuit photocurrent density (
J
sc
), which appears to be governed by the iodide ion conductivity. It is also found that
J
sc
correlates with the iodide ion transference number estimated from DC polarization data taken with non-blocking iodine electrodes. This study suggests that binary iodide mixtures may be used to obtain efficiency enhancement in different types of DSSCs based on polymeric, gel, or solvent electrolytes.