Ni(III)/(IV) bis(dicarbollide) as a fast, noncorrosive redox shuttle for dye-sensitized solar cells.
Nickel bis(dicarbollide) is used as a fast, one-electron outer sphere redox couple in dye-sensitized solar cells. Device performances with this anionic shuttle are investigated with different electrolyte concentrations and additives, using only 0.030 M of the Ni(III) bis(dicarbollide) to efficiently regenerate the ruthenium dye. Atomic layer deposition of Al(2)O(3) on the nanoparticulate TiO(2) photoanodes is further used to improve device performances, increasing current densities almost 2-fold and attaining power conversion efficiencies approximately 10x greater than its metallocene analogue, ferrocene/ferrocenium. Open-circuit voltage decay is used to probe the kinetics of the Ni(III)/(IV) bis(dicarbollide) redox couple, and electron interception is found to be approximately 10(3)x slower than ferrocene/ferrocenium, explaining the large discrepancy in open-circuit voltage potentials between these two redox shuttles.
Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA.
Tina C
TC
Li
Alexander M
AM
Spokoyny
Chunxing
C
She
Omar K
OK
Farha
Chad A
CA
Mirkin
Tobin J
TJ
Marks
Joseph T
JT
Hupp