Influence of iodide concentration on the efficiency and stability of dye-sensitized solar cell containing non-volatile electrolyte.
Dye-sensitized solar cells based on nanocrystalline TiO(2) have been fabricated with an amphiphilic ruthenium sensitizer NaRu(4-carboxylic acid-4'-carboxylate)(4,4'-dinonyl-2,2'-bipyridine)(NCS)2, coded as Z-907Na, and a series of non-volatile 3-methoxyproprionitrile (MPN)-based electrolytes with different concentration of 1-methyl-3-propylimidazolium iodide (PMII). The short-circuit photocurrent density increases with increasing iodide concentration until at 1.5 M practically quantitative dye regeneration is achieved as proved by time-resolved laser experiments. Devices containing 1.0 M PMII electrolyte show excellent stability during long-time thermal aging at 80 degrees C and under light soaking at 60 degrees C.
Zhang
Zhipan
Z
Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
Ito
Seigo
S
Moser
Jacques-E
JE
Zakeeruddin
Shaik M
SM
Grätzel
Michael
M