Influence of sodium cations of N3 dye on the photovoltaic performance and stability of dye-sensitized solar cells.
We report on the effect of substituting the two tetrabutyl ammonium counter ions of the standard N719 dye by sodium ions on the performance and stability of dye-sensitized solar cells (DSCs). The disodium analogue of N719 in conjunction with a non-volatile electrolyte gives a conversion efficiency of 7.6% under standard global AM 1.5 sunlight. Devices maintain 99% of their initial performance after 1000 h under full sunlight aging at 50 degrees C. Electrochemical impedance spectroscopy and photovoltage transient decay studies reveal the evolution of the solar cell parameters during aging. Remarkably, upon aging a decrease in the rate of electron back reaction with the triiodide ions across the TiO(2)/electrolyte interface appears as well as enhanced electronic conduction in the TiO(2) film.
Andrade
Luísa
L
Laboratory of Process, Environment and Energy Engineering, Department of Chemical Engineering, Faculty of Engineering at the University of Porto, Rua Dr. Roberto Frias, s/n 4200-465 Porto, Portugal.
Zakeeruddin
Shaik M
SM
Nazeeruddin
Mohammad K
MK
Ribeiro
Helena Aguilar
HA
Mendes
Adélio
A
Grätzel
Michael
M
D002412:Cations / Q000737:chemistry; D004396:Coloring Agents / Q000737:chemistry*; D004563:Electrochemistry; D004573:Electrolytes / Q000737:chemistry; D008567:Membranes, Artificial; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000737:chemistry*; D010777:Photochemistry; D012680:Sensitivity and Specificity; D012964:Sodium / Q000737:chemistry*; D012993:Solar Energy; D013861:Thiocyanates / Q000737:chemistry*; D013997:Time Factors; D014025:Titanium / Q000737:chemistry
D002412:Cations; D004396:Coloring Agents; D004573:Electrolytes; D008567:Membranes, Artificial; D009942:Organometallic Compounds; D013861:Thiocyanates; C506095:bis(2,2'-bipyridyl-4,4'-dicarboxylate)ruthenium(II) bis(tetrabutylammonium) bis(thiocyanate); C009495:titanium dioxide; D012964:Sodium; D014025:Titanium