title: New efficient ruthenium sensitizers with unsymmetrical indeno[1,2-b]thiophene or a fused dithiophene ligand for dye-sensitized solar cells.
abstract: Two novel ruthenium sensitizers containing unsymmetrical indeno[1,2-b]thiophene or a fused dithiophene unit in the ancillary ligand have been designed and synthesized. The photovoltaic performance of JK-188 using an electrolyte consisting of 0.6 M 1,2-dimethyl-3-propylimidazolium iodide, 0.05 M I(2), 0.1 M LiI, 0.05 M guanidinium thiocyanate, and 0.5 M tert-butylpyridine in acetonitrile revealed a short-circuit photocurrent density of 18.60 mA/cm(2), an open-circuit voltage of 0.72 V, and a fill factor of 0.71, yielding an overall conversion efficiency of 9.54%. The cell exhibits a remarkable stability under 1000 h of light soaking at 60 °C using a quasi-solid-state electrolyte consisting of 5 wt % poly(vinylidenefluoride-co-hexafluoropropylene), 0.6 M 1-propyl-2,3-dimethylimidazolium iodide, 0.5 M N-methylbenzimidazole, and 0.1 M I(2) in 3-methoxypropionitrile, retaining 97% of the initial efficiency (7.38%).
authors.affiliation: Department of Material Chemistry, Korea University, Jochiwon, Chungnam 339-700, Korea.
authors.forename: Jeum-Jong
authors.initials: JJ
authors.lastname: Kim
authors.forename: Kimin
authors.initials: K
authors.lastname: Lim
authors.forename: Hyunbong
authors.initials: H
authors.lastname: Choi
authors.forename: Shengqiang
authors.initials: S
authors.lastname: Fan
authors.forename: Moon-Sung
authors.initials: MS
authors.lastname: Kang
authors.forename: Guohua
authors.initials: G
authors.lastname: Gao
authors.forename: Hong Seok
authors.initials: HS
authors.lastname: Kang
authors.forename: Jaejung
authors.initials: J
authors.lastname: Ko