title: Efficient and stable solid-state dye-sensitized solar cells based on a high-molar-extinction-coefficient sensitizer.
abstract: The high-molar-extinction-coefficient heteroleptic ruthenium dye, cis-Ru (4,4'-bis(5-octylthieno[3,2-b] thiophen-2-yl)-2,2'-bipyridine) (4,4'-dicarboxyl-2,2'-bipyridine) (NCS)(2), exhibits an AM 1.5 solar (100 mW cm(-2))-to-electric power-conversion efficiency of 4.6% in a solid-state dye-sensitized solar cell (SSDSC) with 2,2', 7,7'-tetrakis-(N,N-di-p-methoxyphenylamine)9,9'-spirobifluorene (spiro-MeOTAD) as the organic hole-transporting material. These SSDSC devices exhibit good durability during accelerated tests under visible-light soaking for 1000 h at 60 degrees C. This demonstration elucidates a class of photovoltaic devices with potential for stable and low-cost power generation. The electron recombination dynamics and charge collection that take place at the dye-sensitized heterojunction are studied by means of impedance and transient photovoltage decay techniques.
authors.affiliation: Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology, Lausanne, Switzerland.
authors.forename: Mingkui
authors.initials: M
authors.lastname: Wang
authors.forename: Soo-Jin
authors.initials: SJ
authors.lastname: Moon
authors.forename: Mingfei
authors.initials: M
authors.lastname: Xu
authors.forename: Kethineni
authors.initials: K
authors.lastname: Chittibabu
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.forename: Ngoc-Le
authors.initials: NL
authors.lastname: Cevey-Ha
authors.forename: Robin
authors.initials: R
authors.lastname: Humphry-Baker
authors.forename: Shaik M
authors.initials: SM
authors.lastname: Zakeeruddin
authors.forename: Michael
authors.initials: M
authors.lastname: Grätzel
mesh_terms: D004396:Coloring Agents / Q000737:chemistry*; D017097:Electric Impedance; D004736:Energy-Generating Resources; D010777:Photochemistry / Q000295:instrumentation*; D017785:Photons; D014025:Titanium / Q000737:chemistry
chemical_list: D004396:Coloring Agents; C009495:titanium dioxide; D014025:Titanium