title: Molecularly Engineered Ru(II) Sensitizers Compatible with Cobalt(II/III) Redox Mediators for Dye-Sensitized Solar Cells.
abstract: Thiocyanate-free isoquinazolylpyrazolate Ru(II) complexes were synthesized and applied as sensitizers in dye-sensitized solar cells (DSCs). Unlike most other successful Ru sensitizers, Co-based electrolytes were used, and resulting record efficiency of 9.53% was obtained under simulated sunlight with an intensity of 100 mW cm(-2). Specifically, dye 51-57dht.1 and an electrolyte based on Co(phen)3 led to measurement of a JSC of 13.89 mA cm(-2), VOC of 900 mV, and FF of 0.762 to yield 9.53% efficiency. The improved device performances were achieved by the inclusion of 2-hexylthiophene units onto the isoquinoline subunits, in addition to lengthening the perfluoroalkyl chain on the pyrazolate chelating group, which worked to increase light absorption and decrease recombination effects when using the Co-based electrolyte. As this study shows, Ru(II) sensitizers bearing sterically demanding ligands can allow successful utilization of important Co electrolytes and high performance.
authors.affiliation: Department of Chemistry and Low Carbon Energy Research Center, National Tsing Hua University , Hsinchu 30013, Taiwan.|Institute of Chemical Sciences and Engineering, Laboratory of Photonics and Interfaces, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland.
authors.forename: Kuan-Lin
authors.initials: KL
authors.lastname: Wu
authors.affiliation: Group for Molecular Engineering of Functional Materials, Ecole Polytechnique Federale de Lausanne Valais Wallis , Rue de l'Indutrie 17, 1950 Sion, Valais, Switzerland.
authors.forename: Aron J
authors.initials: AJ
authors.lastname: Huckaba
authors.affiliation: Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology , Avda. Països Catalans 16, 43007 Tarragona, Spain.
authors.forename: John N
authors.initials: JN
authors.lastname: Clifford
authors.affiliation: Department of Chemistry and Low Carbon Energy Research Center, National Tsing Hua University , Hsinchu 30013, Taiwan.
authors.forename: Ya-Wen
authors.initials: YW
authors.lastname: Yang
authors.affiliation: Institute of Chemical Sciences and Engineering, Laboratory of Photonics and Interfaces, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland.
authors.forename: Aswani
authors.initials: A
authors.lastname: Yella
authors.affiliation: Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology , Avda. Països Catalans 16, 43007 Tarragona, Spain.|ICREA , Avda. Lluis Companys, 23, E-08010 Barcelona, Spain.
authors.forename: Emilio
authors.initials: E
authors.lastname: Palomares
authors.affiliation: Institute of Chemical Sciences and Engineering, Laboratory of Photonics and Interfaces, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland.
authors.forename: Michael
authors.initials: M
authors.lastname: Grätzel
authors.affiliation: Department of Chemistry and Low Carbon Energy Research Center, National Tsing Hua University , Hsinchu 30013, Taiwan.
authors.forename: Yun
authors.initials: Y
authors.lastname: Chi
authors.affiliation: Group for Molecular Engineering of Functional Materials, Ecole Polytechnique Federale de Lausanne Valais Wallis , Rue de l'Indutrie 17, 1950 Sion, Valais, Switzerland.
authors.forename: Mohammad Khaja
authors.initials: MK
authors.lastname: Nazeeruddin